App Development Agancy

Krootl is an app development agency and certified Flutter development company delivering full-cycle software development services.

Founded in 2018, we help startups and enterprises design, develop, and scale mobile and web applications.

We specialize in cross-platform app development with Flutter, building high-performance solutions for iOS, Android, and web from a single codebase. Our team also supports Flutter migration and works with legacy systems, helping businesses modernize existing products without disrupting operations.

What We Do

  • Strategy & Consulting: business analysis, market research, requirements definition
  • Product Design: UX/UI design, prototyping, usability testing
  • App Development: frontend, backend, cross-platform (Flutter)
  • MVP Development: fast product launches for early traction and validation
  • Modernization: Flutter migration and legacy system upgrades
  • Support & Growth: post-launch support, updates, feature development
  • Team Augmentation — dedicated remote teams

Kicking off your next big thing? Let’s make it together. Our mission is to help businesses grow through impactful products

Drop us a line for a free personalized strategy session - [email protected]

Partner Programs

Google Partner
Ukraine Ukraine
Saksahanskogo 32, Kyiv, kyiv 01001
+380631599355
$25 - $49/hr
10 - 49
2018

Why Krootl?

  • Flutter-first development expertise
  • Small team, direct C-level involvement
  • Fast MVPs with scalable architecture

Service Focus

Focus of Mobile App Development
  • iOS - iPhone - 25%
  • Android - 25%
  • iOS - iPad - 10%
  • Flutter - 40%
Focus of Software Development
  • Java - 80%
  • ReactJS - 20%

Industry Focus

  • Financial & Payments - 20%
  • Hospitality - 20%
  • Education - 10%
  • Healthcare & Medical - 10%
  • E-commerce - 10%
  • Travel & Lifestyle - 10%
  • Startups - 10%
  • Enterprise - 10%

Client Focus

80% Small Business
20% Medium Business

AI Tools & Purpose

Cursor Cursor

AI-assisted coding and codebase navigation

Claude Claude

Code review, reasoning, and documentation

Vercel Vercel

Frontend deployment and performance optimization

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Client Portfolio of Krootl

Project Industry

  • Travel & Lifestyle - 17.6%
  • Other Industries - 17.6%
  • Startups - 5.9%
  • Education - 11.8%
  • Business Services - 5.9%
  • Hospitality - 5.9%
  • Food & Beverages - 11.8%
  • Financial & Payments - 5.9%
  • E-commerce - 11.8%
  • Media - 5.9%

Major Industry Focus

Travel & Lifestyle

Project Cost

  • $10001 to $50000 - 35.3%
  • Not Disclosed - 23.5%
  • $100001 to $500000 - 11.8%
  • $50001 to $100000 - 29.4%

Common Project Cost

$10001 to $50000

Project Timeline

  • Not Disclosed - 5.9%
  • 1 to 25 Weeks - 35.3%
  • 26 to 50 Weeks - 11.8%
  • 51 to 100 Weeks - 41.2%
  • 100+ Weeks - 5.9%

Project Timeline

51 to 100 Weeks

Portfolios: 17

Meditation & Personal Growth App

Meditation & Personal Growth App

  • Meditation & Personal Growth App screenshot 1
  • Meditation & Personal Growth App screenshot 2
  • Meditation & Personal Growth App screenshot 3
$10001 to $50000
14 weeks
Travel & Lifestyle

Radiate is a meditation and audio wellness app created by wellness influencer Amber Lyon as part of the Modern Mind ecosystem.

The app is designed to help users regulate their nervous system, shift emotional states, and build consistent self-development habits through guided audio experiences. It translates the founder’s methodology into a structured, mobile-first product focused on daily use and long-term engagement.

Core features:

Structured audio content system
Modular library of guided sessions (morning, sleep, reset) designed for scalable content delivery.
Advanced audio playback engine
Built-in player with background playback, session continuity, and uninterrupted listening experience.
Personalized content delivery layer
Adaptive content recommendations based on user behavior, engagement, and usage patterns.
State-shift interaction mechanics
Short-form audio units (“declarations”) enabling fast emotional and cognitive resets.
Habit formation & retention system
Challenge-based flows designed to drive consistency, repeat usage, and long-term engagement.
Subscription-based access model
Freemium structure with gated premium content and recurring revenue mechanics.

Retention-focused product design
UX optimized for daily interaction, low friction, and high user return rates.

Gamified Wellness Application

Gamified Wellness Application

  • Gamified Wellness Application screenshot 1
  • Gamified Wellness Application screenshot 2
  • Gamified Wellness Application screenshot 3
Not Disclosed
75 weeks
Other Industries

NestEgg is a cross-platform wellness application designed to improve employee engagement through team-based fitness challenges. The platform integrates with wearable devices to track activity and uses a complex, gamified scoring system to fairly measure progress across different fitness levels.

Built as a mobile app, it helps companies promote healthier habits, increase motivation, and create a sense of community within teams.

Core features:
Gamified scoring system that adapts to individual fitness levels
Team-based challenges 
Wearable integration for automatic activity tracking (steps, workouts, etc.)
Real-time leaderboards and progress tracking across teams
Habit-building mechanics focused on long-term engagement
User-friendly interface designed for daily interaction and retention

Job Matching Platform

Job Matching Platform

  • Job Matching Platform screenshot 1
$100001 to $500000
60 weeks
Startups

Hiring Marketplace Platform
A hiring marketplace featuring a responsive web app, mobile solutions, and an admin panel. The platform connects employers and job seekers by enabling job browsing, applications, real-time communication, and secure payments.

Core features:
Job seeker tools: browse openings, apply, use advanced filters, and communicate in real time
Employer tools: manage openings, interviews, and payments with ease
Admin panel: advanced oversight, content moderation, and actionable insights
Secure payment system integrated into the workflow

Performance:
High performance - 97/100 speed score and 100/100 SEO score through an SEO-first design and optimized UX

Al-powered Language Learning App

Al-powered Language Learning App

  • Al-powered Language Learning App screenshot 1
$10001 to $50000
4 weeks
Education

SpeakSavvy is a Flutter-built, cross-platform app that leverages the ChatGPT API to deliver endless, personalized language learning content. Using AI instead of manual curation, it offers a genuinely adaptive experience.

Core features:
Personalized content
Customizable reminders 
Endless audio examples, never run out of things to listen to
Built-in feedback tools to track and improve learning
In-app analytics to track progress over time
Fresh, intuitive design that makes learning enjoyable
Freemium model – free core features with an option to upgrade for more

GPT-Powered Chatbot Application

GPT-Powered Chatbot Application

  • GPT-Powered Chatbot Application screenshot 1
$10001 to $50000
4 weeks
Business Services

An AI-powered chatbot app built with Flutter, designed to make conversations with artificial intelligence accessible and effortless. The app combines casual, everyday use with practical learning and creative support — all without requiring registration or upfront payment.

Core features:
Academic help: solve math problems, draft essays, or prepare for tests
Content generation: create tweets, blog posts or emails
Knowledge support: get clear answers across a wide range of topics
Language assistance: translate text, correct grammar, or simplify complex content
Always-on companion: start chatting right away, no sign-up required
Cross-platform experience: seamless performance across iOS and Android

An Inclusive App for audiobooks

An Inclusive App for audiobooks

  • An Inclusive App for audiobooks screenshot 1
  • An Inclusive App for audiobooks screenshot 2
$50001 to $100000
50 weeks
Other Industries

A mobile application that combines a classic bookstore shopping experience with a built-in e-book reader and audiobook playback for a Ukrainian publisher. The app features a rich catalog of audio, paper, and e-books, seamless payment and delivery integrations, and a strong focus on accessibility - validated through testing with blind and low-vision users.

Core features:
Book catalog, homepage banners & highlights, categories, and fast search
Checkout & Orders: cart, checkout, delivery integration, payment integration, order history, and a loyalty program
E-book reader and audiobook playback to read or listen to purchased titles; easy navigation by chapters and bookmarks
Offline Support: local caching, so reading/listening works even without internet
Accessibility: UI and UX designed for visually impaired users, with accessible annotations for each interface element and comprehensive testing with blind and low-vision readers

Gamified Business Learning App

Gamified Business Learning App

  • Gamified Business Learning App screenshot 1
$50001 to $100000
56 weeks
Education

SkillRange is a cross-platform learning application designed to help users build real-world business skills through interactive content, simulations, and AI-guided learning.

The platform combines structured learning paths with hands-on activities, allowing users to progress through topics like marketing, finance, and operations while applying knowledge in simulated business scenarios. Instead of passive content consumption, SkillRange focuses on learning by doing, supported by short-form content and adaptive guidance.
Our role:
Krootl was responsible for Flutter development of the user-facing application, including frontend architecture, UI implementation, and integration with backend services.

Core features:

Structured learning tracks: skill-based progression paths across business domains (marketing, finance, operations).

Interactive learning experience: short-form content, scrollable lessons, and hands-on activities instead of traditional lectures.

Built-in simulation engine: business scenarios and tycoon-style simulations to apply knowledge in real-world contexts.

AI-powered mentor system: in-app assistant providing guidance, explanations, and contextual support during learning.

Custom learning playlists: users can create personalized tracks aligned with their goals and career paths.

Progress tracking & skill mapping
Visual tracking of user growth across different business competencies.

Gamification & engagement mechanics: challenges, streaks, and progression systems designed to increase retention.

Cross-platform architecture: mobile-first experience with scalable backend for content and user progression.

Corporate Wellness & Team Engagement Platform

Corporate Wellness & Team Engagement Platform

  • Corporate Wellness & Team Engagement Platform screenshot 1
  • Corporate Wellness & Team Engagement Platform screenshot 2
  • Corporate Wellness & Team Engagement Platform screenshot 3
$100001 to $500000
Ongoing
Other Industries

NestEgg is a cross-platform wellness application designed to improve employee engagement through team-based fitness challenges. The platform integrates with wearable devices to track activity and uses a complex, gamified scoring system to measure progress across different fitness levels fairly.

Built as a mobile app, it helps companies promote healthier habits, increase motivation, and create a sense of community within teams.

Core features:

  • Gamified scoring system that adapts to individual fitness levels
  • Team-based challenges
  • Wearable integration for automatic activity tracking (steps, workouts, etc.)
  • Real-time leaderboards and progress tracking across teams
  • Habit-building mechanics focused on long-term engagement
  • User-friendly interface designed for daily interaction and retention
Community Food Platform

Community Food Platform

  • Community Food Platform screenshot 1
$10001 to $50000
8 weeks
Travel & Lifestyle

Oriri is a community platform that connects food lovers, culinary professionals, and sustainable businesses through stories highlighting the origins, people, and practices behind every plate.

Core features:

  • Business profiles auto-generated from websites
  • Story publishing and discovery
  • Search and connection builder
  • Interactive map to locate producers, shops, and restaurants
  • Notifications center
  • Instagram integration
  • Multi-language support
Online Ordering App for Restaurant

Online Ordering App for Restaurant

  • Online Ordering App for Restaurant  screenshot 1
$50001 to $100000
80 weeks
Hospitality

Worderfood is a food tech product designed to simplify the dining experience. 
The app facilitates kitchen operations by allowing guests to place orders directly from their smartphones. It fits well with different types of places, offering a simple solution for both guests and restaurants. 
The solution consists of a guest app, a restaurant app, and a super admin.

Core functionality:

  • QR code ordering – guests scan a table QR to access a contactless digital menu
  • Real-time order tracking – from placement to kitchen preparation and notifications
  • Dynamic menu control – instant updates to items, prices, and availability
  • Customizable orders – allow guests to modify dishes based on preferences
  • Robust merchant tools – menu management, QR generation, flexible charges, discounts, order history, and search
  • Role-based access control – super admin panel supports merchant onboarding and data oversight
FMCG Distribution Management App

FMCG Distribution Management App

  • FMCG Distribution Management App screenshot 1
  • FMCG Distribution Management App screenshot 2
$10001 to $50000
16 weeks
Food & Beverages

A supply chain optimization app built for a leading FMCG manufacturer. The platform helps vendors restock products, track orders, and manage documentation, reducing the need for in-person visits and speeding up internal workflows.

Core features:

  • Product catalog access – vendors browse an up-to-date inventory including availability, pricing, and specs
  • Order placement & tracking – intuitive restocking orders with real-time status updates
  • Offline support – key functionality remains accessible even without internet connection
  • Documentation management – centralized access to essential agreements and contracts by retail location
  • Call center support – web-based interface for support agents to manage orders during customer calls
  • Odoo integration – syncs order data with CRM/accounting systems for automated shipment documentation and planning
  • Role-specific interfaces – tailored views for vendors, merchants, and admins to match their operational needs
  • Marketing materials – branding, logo, landing pages, and promotional site crafted to showcase solution features
Food delivery App: Client and Courier apps

Food delivery App: Client and Courier apps

  • Food delivery App: Client and Courier apps screenshot 1
$50001 to $100000
65 weeks
Food & Beverages

Cooker is a complex solution for fast grocery delivery service. The platform includes both a user-friendly customer app and an on-demand courier delivery application.
The iOS application reached the top 10 in Ukraine’s AppStore’s “Shopping” category ranking, which we think is a great achievement overall (because of fierce competition from global companies such as eBay, Zara, AliExpress, Lidl, etc. in the delivery/shopping segment).

Core functionality:

  • Real-time Delivery Tracking - users can easily track their orders from start to finish, tracking every step of the delivery process, from submission to arrival 
  • Flexible Payment options- the app allows users to choose multiple payment options including paying card, ApplePay, and Gpay, or opting for cash on delivery
  • Instant Push Notifications - on the order status are sent to all app users, from customers to the delivery crew.
  • Route Optimization & GPS -the app automatically suggests the quickest and the most efficient route, while also estimating the delivery time. 
  • Dynamic Product Catalog - the dynamic catalog tailors the item selection to individual users based on their location and demographics. Matching the featured products with users’ interests and needs.
  • Seamless delivery process - the developed technical infrastructure and its seamless and efficient work made it possible to deliver products in a record time of 15 minutes.
     
Minfullness App for guided Meditations

Minfullness App for guided Meditations

  • Minfullness App for guided Meditations screenshot 1
  • Minfullness App for guided Meditations screenshot 2
$50001 to $100000
42 weeks
Travel & Lifestyle

WBP is a meditation app and a smart companion for individuals seeking to enhance their well-being and cultivate mindfulness.
Users can join guided programs designed for their objectives, whether it is improving sleep, handling anxiety, or nurturing personal development. The app offers customized meditation sessions and progress tracking based on a unique methodology and creates a nurturing space for people to build a steady meditation routine.

Core functionality:

  • Custom meditation controls.
  • Timer functionality for seamless meditation sessions
  • Dynamic meditation design based on daytime
  • Seamless video/audio player integration
  • Organized original content categories for easy navigation.
  • Efficient content search for quick access to specific topics.
  • Custom Scores and In-App Achievements
  • Daily Affirmation Collection
  • Push-Notifications to encourage Consistent Meditation:
  • Custom reminders to maintain a consistent meditation routine
  • Journaling 
  • English and Chinese languages support
  • User Goal Setting
Financial Well-Being App

Financial Well-Being App

  • Financial Well-Being App screenshot 1
Not Disclosed
100+ weeks
Financial & Payments

The Grassfeld application is a comprehensive personal finance management system that empowers users to control their finances right in the smartphone. 
With the ability to track expenses, manage budgets, and stay on top of financial matters, iBilly is an essential tool for anyone seeking to maintain a healthy financial lifestyle.

Our ultimate goal was to provide a secure and user-friendly personal financial management tool with a focus on consistent functionality across iOS and Android platforms. 

Core functionality: 

1. Open Banking Integration: iBilly connects users to over 15,000 financial institutions through Klarna Kosma's Open Banking API.
2. Transaction Management: The app synchronizes and categorizes users' bank transactions using Kosma's API.
3. Financial Insights: iBilly generates intelligent insights into users' present and future financial well-being.
4. Intelligent search: functionality to efficiently navigate financial data
5. Cloud-based storage for the effortless organization of receipts, guarantee cards, and other financial documents

All-in-One AR print studio

All-in-One AR print studio

  • All-in-One AR print studio screenshot 1
  • All-in-One AR print studio screenshot 2
Not Disclosed
100 weeks
E-commerce

| AR | E-commerce | Media |

A suite of apps designed to create AR-enhanced live photo books. 
The app enables users to create print products with embedded AR videos from their phone's media. Scan a print product with the app, and its AR video overlay brings it to life, revolutionizing the interaction with physical items. 

A marker-based augmented reality application for both iOS and Android platforms complemented by a MacOs admin panel and an iPad Showroom application.

Client App core functionality:
Catalog
Product Details
Shopping Cart
Shipping Options
ApplePay
Order Summary
Image and video editing tools
Print editor 

Showroom (iPad App):
Catalog
Product Details
Direct in-store WiFi data transfer to ease sending media from the user’s phone
Editing tools

Admin panel CMS (Mac OS)
User Management
Sales Data Aggregation
Order Management
Customer Support Integration
Reporting and Analytics

Mobile Shopping App

Mobile Shopping App

  • Mobile Shopping App  screenshot 1
Not Disclosed
100 weeks
E-commerce

A mobile shopping cart solution for Eastern Europe's leading manufacturer and distributor of household and hygiene products. Our goal was to build iOS and Android applications and seamlessly integrate them with the Magento engine e-commerce shop.

The app features a streamlined catalog, categorized by product types and brands, to facilitate easy navigation and help customers locate desired items. The home screen showcases new arrivals, exclusive offers, bestsellers, and special deals, providing users with convenient options to explore.

Core functionality:
Product Details
Shopping Cart
Secure Checkout
Payment Integration
Wishlist
Personalized Recommendations
Notifications
Customer Reviews and Ratings

Augmented reality video filter app

Augmented reality video filter app

  • Augmented reality video filter app screenshot 1
$10001 to $50000
10 weeks
Media

AR video effect app that allows users to create surreal live videos and photos using a variety of amazing digital filters.

The app is powered by Apple's AR engine (ARKit) and advanced low-level graphics programming to ensure seamless real-time effects application.

Core functionality:

  • Real-time people recognition with iOS built-in machine learning
  • Huge collection of filters
  • Customizable effects - adjust color, speed, size, delay, and many more
  • Music playback through iTunes or any other app and video recording with Empio at the same time
  • iPad support - we made great use of the iPad's screen real estate in creating   this app
  • Ability to share creations or save locally