Mobile App and Web Development Company

Simpalm is a leading digital product development company in the USA, specializing in UI/UX design, mobile app development, web development, AI solutions, and SaaS platforms. With offices in Maryland, Chicago and New York, we’ve been building transformative digital solutions for startups, established companies, and nonprofits.  Our digital solutions have solved challenges for healthcare, financial services, construction, education, IoT, charities, associations and SaaS industry. 

Our team of experienced project managers, designers, developers, and testers combines creativity with cutting-edge technology to turn ideas into high-performing apps, websites, and AI-driven systems. We focus on delivering products that enhance efficiency, scalability, and user experience — helping organizations grow faster in today’s digital-first world.

With over 400+ successful deployments, Simpalm has become a trusted partner for businesses looking to design, develop, and scale their digital products. Beyond development, we offer continuous support and maintenance to ensure your solution remains secure and future-ready.

Our Main Services:

  • Discovery and Design: Define requirements, create wireframes, and design visually engaging UI/UX for your app or website.

  • Custom App Development: Build AI-powered mobile apps using React Native, Swift, Kotlin, and Flutter.

  • Website Design and Development: Craft CMS-based websites in WordPress, Drupal, or Hubspot CMS to represent your brand or organization effectively.

  • Web and SaaS Applications: Develop scalable SaaS or web portals using React, Node.js, .NET, and Python.

  • AI Strategy and Development: Create tailored AI strategies, chatbots, and automation workflows that empower your business.

  • Support and Maintenance: End-to-end technical support to keep your products performing seamlessly.

United StatesUnited States
11821 Parklawn Drive, Suite 130, Silver Spring, MD 20852
301-541-3076
United StatesUnited States
205 N Michigan Ave Suite 810, Indore, MP 60601
312-554-5843
United StatesUnited States
1775 Tysons Blvd 5th Floor, 22102
301-541-3076
United StatesUnited States
535 5th Ave 4th floor, New York, NY 10017, 20002
301-541-3076
$50 - $99/hr
10 - 49
2009

Why Simpalm?

  • 15 Years of Experience in App and Web Development
  • Hybrid Shoring Model
  • One Stop Shop

Service Focus

Focus of Mobile App Development
  • iOS - iPhone - 35%
  • Android - 25%
  • Flutter - 15%
  • iOS - iPad - 10%
  • React Native - 10%
  • Swift - 5%
Focus of Web Development
  • Wordpress - 25%
  • Kentico - 25%
  • Joomla - 25%
  • Drupal - 25%
Focus of Software Development
  • Java - 50%
  • PHP - 50%
Focus of App Designing (UI/UX)
  • iPhone - 50%
  • Android - 30%
  • Wearables - 10%
  • Usability - 8%
  • Icon - 2%

Industry Focus

  • Education - 20%
  • Financial & Payments - 20%
  • Government - 20%
  • Healthcare & Medical - 20%
  • NGOs - 10%
  • Neo-banks - 10%

Client Focus

45% Small Business
30% Midmarket Business
25% Enterprise

Review Analytics of Simpalm

36
Total Reviews
5.0/5
Overall Rating
7
Recent Reviews

What Users Say

Smooth, collaborative team—responsive and always helping us find solutions and move forward.
Julia Melo
Julia Melo, Administrator at KAH
Solid partner for building our logistics app
Michael Milanoski
Michael Milanoski, Co-Founder at TransloadX
Reliable team that delivers on time and communicates well
Matt Rudnick
Matt Rudnick, Founder and CEO at Main Sheet LLC
Great team that built our telehealth and patient care app from start to finish
Morley Baker
Morley Baker, Founder & CEO at Shed
Great team that built our skincare app from start to finish
Aubri Thompson
Aubri Thompson, Founder and CEO at Rebrand Skincare

What Users Like The Most

  • What we liked most about SimPalm was their responsiveness and problem-solving mindset—they don’t just execute tasks, they actively help find solutions and keep things moving forward.
  • We appreciate that they stayed on budget, provided post-release support, and helped us with additional tasks without extra charges. Their commitment to fulfilling the contract and going above and beyond has been commendable.
  • They were fast and educated us about the PWA.

What Users Like The Least

  • What we liked the least about SimPalm was that, at times, timelines shifted more than we would have liked—but the team was always communicative and worked with us to keep things on track.
  • Not that I can think of.
  • Testing could have been a bit faster, but everything else was solid.

Detailed Reviews of Simpalm

Christine Murphy
Christine Murphy, Co-Founder at BookClub
Posted on Oct 17, 2023

Excellent Work Ethics and Responsiveness.

They assigned a very experienced PM for the project, we used to have weekly calls for progress updates. All milestones and project tasks were added in the JIRA and we were able to communicate via project management tools and via email and call. They were able to provide very good feedback in the design process, we accepted some of their suggested features in the app. They did the unit testing and functional testing on the web app. We only had to do UAT, they had prepared the test cases. Their team was very good. They delivered the project in time.

What was the project name that you have worked with Simpalm?

Web Based App for Internal Use

What service was provided as part of the project?

Mobile App Development, App Designing (UI/UX)

Describe your project in brief

- Creating full UIUX for the web app: Clickable Design prototype
- Creating responsive web app: deployed on AWS

What is it about the company that you appreciate the most?

The recommendations they made to improve the product.

What was it about the company that you didn't like which they should do better?

I wish they had a consultant to send onsite for a week in the bay area.

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $50001 to $200000
  • Completed
  • Education
Emiliano Abramzon
Emiliano Abramzon, Co-Founder at Nearpod
Posted on Sep 29, 2023

We are happy with what they did.

We were using Agile methodology for the project. We were assigned a PM, who was managing the design and development team. We had weekly catchup calls and were using basecamp for project management. Initially they worked on the design of the app, they delivered clickable wireframes, which were approved by our team. They completed the project in around 6 months. In the development phase, we used to get the tested built for final acceptance. We went a little bit above the budget, that was due to us adding some requirements. They also published our apps in the app store.

What was the project name that you have worked with Simpalm?

Mobile App Development for eLearning Company

What service was provided as part of the project?

Mobile App Development

Describe your project in brief

We wanted to build a mobile app for one of our offerings and we did not have resources available at the time. We learnt about Simpalm through a reference and we reached out to them with the requirement. Simpalm showed their process and also previous similar work. They also understood our requirements very well. We decided to hire them and they delivered the apps in time. My product team has liked their work, we will use them in future as well.

What is it about the company that you appreciate the most?

They have resources onshore and offshore, this helped us to get the quality and pricing.

What was it about the company that you didn't like which they should do better?

I can not think of anything.

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $10001 to $50000
  • Completed
  • Education
Phillip Max
Phillip Max, Director of Human Resources at Roth Staffing
Posted on Jun 20, 2023

Simpalm build custom iOS and Android app for us.

One of our client had the requirement to build a native mobile app and we did not have an internal team for this project. We were looking to hire a reliable team to meet our client's project. We decided to hire Simpalm because they had a very good experience with a strong background in building native mobile apps for iOS and Android platform. We provided them with our requirement specifications. Simpalm's team of experienced project managers, developers, and testers worked on the project and provided weekly update on the progress. They finished native iOS and Android app development, app designing, and back end development and delivered the project under our budget in around 9 months time. We are satisfied with Simpalm's work and we will hire them for the maintenance.

What was the project name that you have worked with Simpalm?

Native App Development for Financial Services

What service was provided as part of the project?

Mobile App Development

Describe your project in brief

Our project involved building a fintech mobile app on iOS and Android. It had features similar to Venmo app with peer to peer payment transactions. It is centered around sending micro payments to service providers.

What is it about the company that you appreciate the most?

They assigned an experienced project manager who managed the timeline very well. Also, they were quick to understand our requirements.

What was it about the company that you didn't like which they should do better?

I can not think of any issue right now.

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $10001 to $50000
  • Completed
  • Financial & Payments
Matthias Sala
Matthias Sala, CEO at Gbanga
Posted on May 15, 2023

They were reliable, responsive, and delivered a high-quality mobile app for our internal project.

Throughout the project, Simpalm delivered excellent work and exceeded our expectations. They were quick to address any issues that arose, and they always kept us informed of progress. The final product was a high-quality, user-friendly mobile app that has received positive feedback from our team and users. We plan to continue working with Simpalm for maintenance and future updates. Their team is knowledgeable and responsive, and we have complete confidence in their ability to keep the app running smoothly.

What was the project name that you have worked with Simpalm?

Simpalm built custom iOS and Android App for us

What service was provided as part of the project?

Mobile App Development

Describe your project in brief

Our studio creates games and we were looking for a reliable partner to develop a mobile app for one of our internal projects. We needed a company to create a native iOS and Android App. We did not have our own team to build native iOs and Android App, so we decided to hire an external team. We liked Simpalm because they have a very strong background in custom app development and they had a global delivery model. We provided them with our design mockup and specifications. They did a kickoff with a PM/BA, Developers and testers. They provided us bi-weekly update and delivered the project in around 9 months. We are very happy with their work and will continue to use them for maintenance.

What is it about the company that you appreciate the most?

From the start, they demonstrated their strong technical capabilities and commitment to delivering a high-quality product. Their project management skills were also top-notch, with bi-weekly updates and constant communication throughout the development process.

What was it about the company that you didn't like which they should do better?

There is nothing significant that Simpalm needs to do better. They were reliable, communicative, and delivered a high-quality product within the expected

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $10001 to $50000
  • Completed
  • Gaming
Lois J. Barnes
Lois J. Barnes, Procurement Manager at Insight
Posted on Mar 13, 2023

We have been impressed by Simpalm's expertise on custom app

We hired Simpalm to build a custom educational app for internal use. We did not have the resources to build this app internally. We searched for app development companies and found Simpalm. They built the app on iOS and Android in around 5 months. They did a very good job in designing the app and then developing it using Reactnative framework for both iOS and Android platform. They delivered what they promised in time and in budget.

What was the project name that you have worked with Simpalm?

Custom App for Internal Team

What service was provided as part of the project?

Mobile App Development, Web Development, App Designing (UI/UX)

Describe your project in brief

We needed a mobile app for our internal team. This app is a reference guide and educational app for our sales team so that they can use it to demo our values to the customer. We did not have bandwidth to build this app ourselves, so we hired Simaplm. They did a very good job in building this app.

What is it about the company that you appreciate the most?

Their design process was very detailed and precise. The created clickable design on Figma that our team liked a lot.

They estimated the cost of the budget very accurately. They did a fixed cost estimate for us.

They were very good in project communication and QA of the app.

What was it about the company that you didn't like which they should do better?

I did not find anything wrong with their work. We were happy with the,

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $50001 to $200000
  • Completed
Exavier Tyler
Exavier Tyler, Corporate Procurement Manager at WorldPay
Posted on Dec 23, 2022

Simpalm built a great payment application for our financial services

We hired Simpalm after shortlisting and interviewing several companies. We were looking for a company who had good experience in payment industry and they had built several payment apps. They were very thorough in describing the project challenges and followed the process to build the application on mobile and web. We are very satisfied with them and using them to support the application.

What was the project name that you have worked with Simpalm?

Payment Application for Small Businesss

What service was provided as part of the project?

Mobile App Development, Web Development, App Designing (UI/UX)

Describe your project in brief

We are a financial company and provide several products and services to our clients. We needed a payment processing application for our merchants which could have the latest design and work on iOS, Android and web platform using RecatNative. They built the app and also did the integration with the card readers and payment gateway.

What is it about the company that you appreciate the most?

Great communication by Project Managers and QAs during the SDLC process

Stay in budget and time, they provided an estimate and stayed close to it.

What was it about the company that you didn't like which they should do better?

I wish they had office in Texas as well, so we could meet them more in person.

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $200000+
  • Completed
Michael Britt
Michael Britt, Director of People Operations at Aspen Skiing Company
Posted on Nov 4, 2022

Simpalm did a great job in building our internal platform

We hired Simpalm to build a mobile app and web platform for our internal staff so that we can improve our operations. We have 1000+ employees and built a platform that is used for assets management for multiple locations. They did a great job in building the mobile apps for field managers and a web interface for administrator. The platform has been in use for last 6 months.

What was the project name that you have worked with Simpalm?

Software Platform for Leisure Industry

What service was provided as part of the project?

Mobile App Development, Web Development, App Designing (UI/UX)

Describe your project in brief

The platform allows our company to track our assets at various resorts and locations. We have thousands of equipment and several people in the field. Mobile app was used by field personnels to define where equipments are in our various properties. Web interface I used by admins to view reports and communicate with the field person.

What is it about the company that you appreciate the most?

Their senior team is great in terms of understanding the requirements.

Their project management team was very great and delivered the project in time,

They were very good in estimating the project and stayed very close to the initial estimates.

What was it about the company that you didn't like which they should do better?

Their senior team is in Chicago/DC, I wish they had someone in Colorado as well. But it did not matter too much.

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $200000+
  • Completed
Ken McLernon
Ken McLernon, CEO and Founder at Stealth Startup
Posted on Jun 10, 2022

The built an amazing healthcare platform for me. I am launching my new platform.

I hired Simpalm around 18 months ago to build a healthcare platform that I am building for HR and Staffing industry. I have hired tech people in the past but I never built a digital platform my self. Simpalm really educated me with the process. They did Discovery and Design to do very detailed wireframes and clickable design for my platform. This really helped me to give a very good shape to my idea. They also built a mobile app and web application. I am keeping them to maintain and enhance the system.

What was the project name that you have worked with Simpalm?

Digital Healthcare Platform for HR and Staffing Companies

What service was provided as part of the project?

Mobile App Development, Web Development, App Designing (UI/UX)

Describe your project in brief

My project includes building a healthcare mobile app for employees and a web admin interface for employees. Simpalm did everything, design, app development, web development and QA. This platform is only for Staffing companies who hire 1099 contractors. This would help staffing companies to provide a great healthcare benefits to contrcator.

What is it about the company that you appreciate the most?

They educated me about the entire process with great PM.

They delivered the product in time, it is a very large application

Their pricing and quality has been great, I am keeping them.

What was it about the company that you didn't like which they should do better?

I could not think of anything, I wish they were in Phoenix, but timezone was not a problem as such.

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $50001 to $200000
  • In Progress
John Kauffman
John Kauffman
Posted on Sep 20, 2019

SimPalm leads the way

Incredibly impressed with the level of excellence and professionalism. There team was hands-on throughout the entire process. They worked with me and alongside me. This wasn't just a transaction, more like a partnership. I really did my research and I am glad I went with SimPalm. I HIGHLY recommend them!

What service was provided as part of the project?

App Designing (UI/UX), Mobile App Development

What is it about the company that you appreciate the most?

The accessibility of the developers

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $10001 to $50000
Reyhana Qreitem
Reyhana Qreitem, Teaching Assistant at George Mason University
Posted on Sep 6, 2018

Great app developer company

Simpalm is an excellent company to get started with as far as app development. Very knowledgeable and flexible to work with. Highly recommend!!

What service was provided as part of the project?

Mobile App Development, App Designing (UI/UX)

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating
Tara Vitori
Tara Vitori, Cognos Analytics - Business Intelligence Reporting Professional (Part-Time) at Ultimate Software
Posted on Aug 22, 2018

SIMPalm review

They are very great to work with. They do milestone contracts as an option which I really like.

What service was provided as part of the project?

Mobile App Development, Software Development

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $10001 to $50000
Mike McGhee
Mike McGhee, Founder & CEO at Shipboxx
Posted on Jan 24, 2018

Skillful & Attentive App Developers

Overall our experience in working with Simpalm has been great. They were able to deliver a complex app design with many intricate functions. We are very happy with the design of our app and the simplicity of its functionality. The UI is very clean which is attributed to the quality of their development.

What service was provided as part of the project?

Mobile App Development, App Designing (UI/UX)

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating
Rachel James
Rachel James, Police Officer at US Government
Posted on Sep 23, 2017

SimPalm is Great!!!

I contacted SimPalm about developing my social media app. Since our initial meeting, they have been reliable, professional, and a pleasure to work with. With this being my first time doing such a thing, they have held my hand through the entire process. I definitely recommend them for any tech service.

What service was provided as part of the project?

Mobile App Development, App Designing (UI/UX)

What is it about the company that you appreciate the most?

Availability.

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $10001 to $50000
Gatosk Operating Company LLC
Gatosk Operating Company LLC, Administrator at Gatosk Operating Company, LLC
Posted on Sep 21, 2017

Superior App Developer

Our company, Gatosk, had been working with Simpalm to develop our powerful app called Grop in 2016 and 2017. Simpalm exceeded our expectations in terms of punctuality, quality, and professionalism. We highly recommend Simpalm for developing your next app!

What service was provided as part of the project?

Mobile App Development, App Designing (UI/UX)

What is it about the company that you appreciate the most?

Flexible and professional.

What was it about the company that you didn't like which they should do better?

Make sure that the app is fully functional before wrapping up the project.

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • $0 to $10000
Harkamal Seth PMP CSM
Harkamal Seth PMP CSM, Project Manager at Hyatt Hotels Corporation
Posted on Aug 31, 2017

They built our internal enterprise mobile apps

We had hired Simpalm to build an internal enterprise app for our employees. Simpalm did an excellent job in completing the project in time and on budget. They created very good UI/UX of the apps and than developed it for both iOS and Android. Their team was very skilled in mobile technology and they kept their process very open and Agile. They were able to add additional resourced to expedite the project. I am very impressed with their team and will rehire them for my project needs.

What was the project name that you have worked with Simpalm?

App Development

What service was provided as part of the project?

Mobile App Development

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

  • Completed

Client Portfolio of Simpalm

Project Industry

  • Financial & Payments - 6.7%
  • Business Services - 13.3%
  • Other Industries - 13.3%
  • Education - 6.7%
  • Startups - 6.7%
  • Legal & Compliance - 6.7%
  • Healthcare & Medical - 26.7%
  • Information Technology - 6.7%
  • Media - 6.7%
  • Art, Entertainment & Music - 6.7%

Major Industry Focus

Healthcare & Medical

Project Cost

  • $50001 to $100000 - 60%
  • $10001 to $50000 - 26.7%
  • $500000+ - 6.7%
  • $100001 to $500000 - 6.7%

Common Project Cost

$50001 to $100000

Project Timeline

  • 1 to 25 Weeks - 33.3%
  • 26 to 50 Weeks - 53.3%
  • 51 to 100 Weeks - 13.3%

Project Timeline

26 to 50 Weeks

Portfolios: 15

Safety Tracking App
Midwest Evaluation & Research Mobile And Web App
The ASRA Coder App
AudioBooksNow
Together Program Mobile and Web Projects
TaptIn
DVD Rental App
Legaltrot - Mobile and Web Platform
Ducknowl Web Project
Bamboo Rewards - Mobile and Web App
SHIFT5
The Real Time App
PayDent Web Project
WineMatch Connect
Forte Mobile Payments

Executive Interview of Simpalm

Piyush Jain
Piyush Jain
CEO and Founder
Visit Profile
Please introduce your company and give a brief about your role within the company?
Simpalm is a niche mobile app development company based in the USA with offices in Washington DC and Chicago Area. We were incorporated in 2009 with the vision of bringing more mobility in the World. We provide full end to end app development services including UIUX design, app development, backend development and web app development. Since our inception, we have delivered 250+ mobile apps for enterprises, start-ups, non-profits, and government agencies.
What was the idea behind starting this organization?
My vision for founding Simpalmwas was to bring more mobility to the world. Back in 2009, when smartphones were becoming popular, companies and startups didn’t have the technical know-how on how to build mobile apps. I quit my job and started with two developers to start building mobile apps. We have grown steadily and build a team of 35 engineers, designers and project managers with expertise in mobility.
What are your company’s business model–in house team or third party vendors/ outsourcing?
All of our team is in-house, which includes designers, developers, testers and project managers. We have three locations: Maryland, Chicago, and India. We offer onshore model and global shoring model to clients. Depending upon the client's requirements and budget, we come up with the right engagement model.
How is your business model beneficial from a value addition perspective to the clients compared to other companies' models?
We provide a unique global shoring model to companies based in the USA. Global shoring model thrives on having senior team onshore, in direct communication with the client and developers being offshore, working behind the scene with the onshore team. The onshore team consists of Project Managers, Technical lead and UX Designer and offshore team consist of software developers and testers. The model provides the value of an onshore company and pricing of an offshore firm.
What industries do you generally cater to? Are your customers repetitive?If yes, what ratio of clients has been repetitive to you?
We serve all different industry verticals including healthcare, education, startups, fin-tech, non-profits, Inc 5000 and Fortune 500 companies.
Mention the objectives or the parameters critical in determining the time frame of developing a mobile app.
Timeframe to develop a mobile app depends upon several parameters such as design, number of features, backend development, third-party integration, the complexity of the features and MVP model. We spend time to analyze the client’s requirements and come up with the estimated timeline.
How much effort in terms of time goes into developing the front end and back end of a mobile app?
Developing front end always require more time than the backend development. If it takes three months to do the front end, backend generally can be done in 2 months or less. We do the front end and backend development simultaneously so that the overall delivery time is shorter.
What are the key parameters to be considered before selecting the right platform for a mobile application?
It depends upon the complexity of features, design intensity and budget. If the app requires very complex functions such as Bluetooth integration, we always go for native frameworks. If the design has a lot of interaction/animation, we still prefer native over the cross-platform framework. If the app is simple, doesn’t require sophisticated features and has a simple design, then we opt for cross-platform tools like ReactNative. If the budget is tight and the client wants to do both iOS and Android Apps, we go for ReactNative.
Which platform do you suggest your clients to begin with when they approach you with an idea (Android or iOS) and why?
We always recommend starting with the iOS App since iPhones are still more popular in the USA compared to Android. iPhones also provide a better ecosystem to test the UIUX of the app.
Android or iOS, Native or Hybrid — which platform is best to use to build your app? What are your recommendations?
Native vs. Hybrid really depends upon what types of the app we are trying to build and what is the budget the client has. If the app has very complex features like BLE integration or require a very high custom design, we always recommend the native approach. If the app is relatively simpler in design and functionality, we recommend the Hybrid Approach. Also if the budget is tight and the client is looking for both the platforms, we go for the Hybrid approach.
What are the key factors that you consider before deciding the cost of a mobile application?
Our pre-sales team thoroughly analyzes the client requirements and do several brainstorming sessions with clients to understand the proper scope of the project. We consider several factors like design, type of functionalities, number of features, backend development and integrations to determine the time and cost. We always make sure to have a lean product with higher ROI so that the app can be launched with the least money and timeline. Once we have a scope defined, we have our Technical Leads review the range and come up with a time and cost estimate.
What kind of payment structure do you follow to bill your clients? Is it Pay per Feature, Fixed Cost, Pay per Milestone (could be in phases, months, versions etc.)
We typically follow Pay per Milestones and Time & Material.
Do you take in projects which meet your basic budget requirement? If yes, what is the minimum requirement? If no, on what minimum budget you have worked for?
Our minimum budget requirement is around $10000 for a new project. For an existing project, we can begin at $5000.
What is the price range (min and max) of the projects that you catered to in 2018?
Our price range varies depending upon the engagement model we have with our client; typically it ranges from $30-$60 per hour.
Which business model do you suggest to your clients enabling them to generate revenue from mobile applications? Why?
I always recommend the monthly subscription as the best business model for mobile apps, since it allows you to offer certain features for free and then charge a monthly subscription.