Top Mobile App Development Companies

Q: Who are the top mobile app development companies?

The list of top mobile app development companies in 2026 includes agencies like Utility, AppMakers USA, Chop Dawg, Openxcell, Goji Labs, WillowTree, Instinctools, Closeloop Technologies, Plavno, SDLC Corp, and Tech Exactly, among others. These top app development companies are recognized for technical depth, delivery track records, and client satisfaction ratings on platforms like Goodfirms. Rankings shift annually based on portfolio strength, adoption of emerging technologies, and verified client reviews — so always cross-check current ratings before shortlisting.

Q: How to choose the top mobile app development agency?

Selecting the right partner from the list of top mobile app development agencies requires more than comparing quotes. Look for:Verified portfolio with apps similar to your category and complexity, Client reviews on trusted platforms like Goodfirms cover communication and delivery, Best mobile app developers who ask smart questions during the discovery call, Transparent project governance — sprint structure, reporting cadence, escalation paths, Post-launch maintenance is included in the scope, not sold separately, Trusted mobile app development partners with clear IP ownership and data security policies,

Q: How much does it cost to hire a mobile app development firm?

The cost to hire a mobile app development firm ranges from $75 to $250/hour. If you choose a fixed pricing model for your app development project, it can cost you from $15,000 to $40,000 for basic apps, $40,000 to $120,000 for mid-level apps, $100,000 - $250,000+ for advanced apps, and $ 250,000 to $ 500,000+ for enterprise-level apps. AI-integrated apps can cost you $50,000–$300,000+. These costs can vary significantly based on your team’s experience level and geographic location. For detailed information on how much it costs to hire a mobile app development company, you can go through Goodfirms’ survey - How Much Does It Cost to Develop an App in 2026? Full Development Cost Breakdown.

Q: How can I find an app development agency that fits my budget?

Start on Goodfirms, where the best mobile app development agencies are filterable by budget range, location, team size, and technology stack. Narrow your list to 5–8 best mobile development firms that have delivered projects in your budget tier — not just your app category. Request itemized proposals rather than lump-sum quotes. Top mobile app developers worldwide with offshore or nearshore delivery models often provide enterprise-quality output at significantly lower rates than US or UK-based studios. Budget fit matters, but scope clarity matters more.

Q: What questions should I ask before hiring a mobile app development provider?

Before signing any contract with a mobile app development provider, ask these:What mobile apps have you built in my industry, and can I speak to those clients?, How do your custom mobile app developers handle OS updates and device fragmentation in QA?, Who owns the source code and all IP at project close?, How does your team manage scope changes mid-sprint?, What do your mobile app development services include post-launch, and at what cost?, How do you integrate third-party APIs or advanced features like AI into your builds?, What makes your team stand out from other best mobile app development companies in your tier?,

Q: Should I hire an in-house developer or outsource to a mobile app development agency?

In-house hiring gives you control and cultural alignment but carries real costs — salary, benefits, recruiting time, and bench risk during slow periods. Top mobile app developers hired in-house work for you exclusively, but replacing gaps in skills means additional hires. Outsourcing to established mobile app development companies gives instant access to full-stack teams, proven delivery processes, and enterprise mobile app development services without headcount overhead. For most startups and mid-market businesses, outsourcing to trusted mobile app development partners delivers faster launches at lower total cost.

Q: How long does it take to develop a mobile app?

For basic apps, it can take 3-6 months to complete the project; a mid-complexity app development project can take 6-9 months to complete, whereas advanced and enterprise-level mobile app projects can take 9-18+ months to complete. These are just estimates; you can ask the trusted mobile app developers you hire for the exact time it can take to develop your mobile app.

Q: What services do mobile app development providers offer?

Mobile app development services typically span the full product lifecycle. Here's what most established app development companies provide:Product discovery, market research, and feasibility consulting, UI/UX design and interactive prototyping, Native iOS and Android app development, Cross-platform development using Flutter or React Native, Backend architecture, API development, and third-party integrations, QA testing across devices, OS versions, and network conditions, App Store and Google Play submission and compliance support, Post-launch maintenance, performance monitoring, and iterative feature releases,

Q: What types of apps do mobile app development companies build?

Mobile app development companies build across a wide spectrum - consumer-facing apps, enterprise tools, eCommerce platforms, healthcare apps, fintech solutions, on-demand service apps, EdTech products, and IoT-connected mobile experiences. Many top app development agencies also build AR/VR applications, wearable integrations, and AI-powered mobile products. The category of an app shapes every decision - from tech stack to compliance requirements. Before approaching any mobile app development company, have a clear sense of your app's category, target user, and primary business function.

Q: What technologies do top app development companies use?

Top app development companies in 2026 build across a layered technology stack. For native development: Swift and SwiftUI for iOS, Kotlin for Android. In cross-platform app development, Flutter and React Native dominate. Backend infrastructure typically runs on Node.js, Python, or Go, with cloud hosting via AWS, GCP, or Azure. AI-driven app development expertise increasingly involves Google's ML Kit, TensorFlow Lite, and OpenAI APIs for on-device and server-side intelligence. Strong mobile app development services also cover CI/CD pipelines, automated testing frameworks, and App Store compliance tooling.

Researched by:Goodfirms Research TeamUpdated:September 6, 2026

Goodfirms has reviewed 26,592 Mobile App Development Companies as of September 2026 across 143 countries. The top-ranked firm is Utility (5.0 stars, 18 verified reviews, $150 - $199/hr, founded 2013, NYC). Across the category, the median hourly rate is $37, median client rating is 4.9, and 24% of firms employ 50+ members. Explore the vetted Mobile App Development Companies below, compare their strengths, and connect with the provider best suited to your requirements.

Goodfirms helps businesses find and connect with the leading mobile app development companies and top mobile app developers worldwide. Companies are independently ranked based on technical expertise, portfolio quality, market presence, and verified client reviews, helping businesses confidently identify trusted mobile app development partners. Use smart filters to compare app development companies by verified client reviews, location, hourly rates, team size, industry expertise, and technologies including AI-driven mobile app development services, cross-platform app development, Flutter, React Native, Swift, Kotlin, iOS, and Android development. Businesses can also evaluate service providers based on their AI-driven app development expertise and ability to build AI-powered mobile applications, intelligent user experiences, and scalable digital products. Browse the best mobile app development companies by region, including mobile app developers in the United States, India, the United Kingdom, Australia and Canada. Whether you need a startup app development company, enterprise mobile app development services, custom mobile app developers, cross-platform app development companies, or AI-powered mobile app development experts, Goodfirms helps you find and compare the right partner for your goals, timeline, and budget.

26,592Verified firms

$37/hrMedian hourly rate

4.9 ★Median rating

143Countries

24%Have 50+ members

How this list is built: All 26,592 firms below pass Goodfirms' 4-step verification process (background check, client interviews, portfolio audit, ongoing quality review). Listings marked "Sponsored" are agencies that pay for premium placement - sponsorship does not affect star ratings or review content.

Top 10 at Glance

Compare the highest-ranked firms first side by side.

Rank

Company

Rating

Reviews

Hourly Rate

Team Size

Founded

Headquarters

Action

List of the Best Mobile App Development Companies (iOS & Android)

Sort By:

Post your project. Get proposals from PRO-verified firms.

Goodfirms recommends the top 3. You pick the winner.

Post a Project

Why Trust Goodfirms

Goodfirms is the world’s leading reviews and ratings company featuring 100,000+ tech companies from across the globe, complete with 80,000+ humanly vetted client reviews, detailed portfolios, hourly rates, employee strength, and more to help you choose your perfect tech partner.

Humanly-Vetted Client Reviews

Our researchers have personally vouched for the authenticity of 80,000+ client reviews by speaking directly with clients, cross-checking project details, timelines, and results to ensure 100% credibility.

Data-Driven Rankings

Data powers our company listings. Every company listed is evaluated based on its expertise, experience, market presence, reviews, and client satisfaction rate, which helps buyers confidently choose the right tech partner.

Global Trust & Recognition

Goodfirms is trusted by 100,000+ businesses in 160+ countries to connect with reliable tech partners. Our reputation is built on 80,000+ verified reviews and rankings you can trust.

Transparency In Detail

From verified client reviews and portfolio highlights to service focus and pricing, Goodfirms provides a 360-degree view of every company, helping 2+ million monthly users find the perfect tech partner.

Frequently Asked Questions

Who are the top mobile app development companies?

The list of top mobile app development companies in 2026 includes agencies like Utility, AppMakers USA, Chop Dawg, Openxcell, Goji Labs, WillowTree, Instinctools, Closeloop Technologies, Plavno, SDLC Corp, and Tech Exactly, among others. These top app development companies are recognized for technical depth, delivery track records, and client satisfaction ratings on platforms like Goodfirms. Rankings shift annually based on portfolio strength, adoption of emerging technologies, and verified client reviews — so always cross-check current ratings before shortlisting.

How to choose the top mobile app development agency?

Selecting the right partner from the list of top mobile app development agencies requires more than comparing quotes. Look for:

Verified portfolio with apps similar to your category and complexity
Client reviews on trusted platforms like Goodfirms cover communication and delivery
Best mobile app developers who ask smart questions during the discovery call
Transparent project governance — sprint structure, reporting cadence, escalation paths
Post-launch maintenance is included in the scope, not sold separately
Trusted mobile app development partners with clear IP ownership and data security policies

How much does it cost to hire a mobile app development firm?

The cost to hire a mobile app development firm ranges from $75 to $250/hour. If you choose a fixed pricing model for your app development project, it can cost you from $15,000 to $40,000 for basic apps, $40,000 to $120,000 for mid-level apps, $100,000 - $250,000+ for advanced apps, and $ 250,000 to $ 500,000+ for enterprise-level apps. AI-integrated apps can cost you $50,000–$300,000+. These costs can vary significantly based on your team’s experience level and geographic location. For detailed information on how much it costs to hire a mobile app development company, you can go through Goodfirms’ survey - How Much Does It Cost to Develop an App in 2026? Full Development Cost Breakdown.

How can I find an app development agency that fits my budget?

Start on Goodfirms, where the best mobile app development agencies are filterable by budget range, location, team size, and technology stack. Narrow your list to 5–8 best mobile development firms that have delivered projects in your budget tier — not just your app category. Request itemized proposals rather than lump-sum quotes. Top mobile app developers worldwide with offshore or nearshore delivery models often provide enterprise-quality output at significantly lower rates than US or UK-based studios. Budget fit matters, but scope clarity matters more.

What questions should I ask before hiring a mobile app development provider?

Before signing any contract with a mobile app development provider, ask these:

What mobile apps have you built in my industry, and can I speak to those clients?
How do your custom mobile app developers handle OS updates and device fragmentation in QA?
Who owns the source code and all IP at project close?
How does your team manage scope changes mid-sprint?
What do your mobile app development services include post-launch, and at what cost?
How do you integrate third-party APIs or advanced features like AI into your builds?
What makes your team stand out from other best mobile app development companies in your tier?

Should I hire an in-house developer or outsource to a mobile app development agency?

In-house hiring gives you control and cultural alignment but carries real costs — salary, benefits, recruiting time, and bench risk during slow periods. Top mobile app developers hired in-house work for you exclusively, but replacing gaps in skills means additional hires. Outsourcing to established mobile app development companies gives instant access to full-stack teams, proven delivery processes, and enterprise mobile app development services without headcount overhead. For most startups and mid-market businesses, outsourcing to trusted mobile app development partners delivers faster launches at lower total cost.

How long does it take to develop a mobile app?

For basic apps, it can take 3-6 months to complete the project; a mid-complexity app development project can take 6-9 months to complete, whereas advanced and enterprise-level mobile app projects can take 9-18+ months to complete. These are just estimates; you can ask the trusted mobile app developers you hire for the exact time it can take to develop your mobile app.

What services do mobile app development providers offer?

Mobile app development services typically span the full product lifecycle. Here's what most established app development companies provide:

Product discovery, market research, and feasibility consulting
UI/UX design and interactive prototyping
Native iOS and Android app development
Cross-platform development using Flutter or React Native
Backend architecture, API development, and third-party integrations
QA testing across devices, OS versions, and network conditions
App Store and Google Play submission and compliance support
Post-launch maintenance, performance monitoring, and iterative feature releases

What types of apps do mobile app development companies build?

Mobile app development companies build across a wide spectrum - consumer-facing apps, enterprise tools, eCommerce platforms, healthcare apps, fintech solutions, on-demand service apps, EdTech products, and IoT-connected mobile experiences. Many top app development agencies also build AR/VR applications, wearable integrations, and AI-powered mobile products. The category of an app shapes every decision - from tech stack to compliance requirements. Before approaching any mobile app development company, have a clear sense of your app's category, target user, and primary business function.

What technologies do top app development companies use?

Top app development companies in 2026 build across a layered technology stack. For native development: Swift and SwiftUI for iOS, Kotlin for Android. In cross-platform app development, Flutter and React Native dominate. Backend infrastructure typically runs on Node.js, Python, or Go, with cloud hosting via AWS, GCP, or Azure. AI-driven app development expertise increasingly involves Google's ML Kit, TensorFlow Lite, and OpenAI APIs for on-device and server-side intelligence. Strong mobile app development services also cover CI/CD pipelines, automated testing frameworks, and App Store compliance tooling.

What are AI-driven mobile app development services?

AI-driven mobile app development services refer to building mobile products with embedded machine learning, natural language processing, computer vision, or generative AI capabilities. AI-powered mobile app development experts integrate these features directly into app architecture — not as surface-level additions. Top AI mobile app development companies like Topflight Apps and EX Squared use on-device ML models, predictive personalization engines, and Gen AI interfaces to build smarter products. AI-driven app development expertise is now a core differentiator for companies building in healthcare, fintech, retail, and enterprise mobility.

What red flags should I watch out for when hiring a mobile app development company?

Even well-presented app development companies can signal problems early. Watch for:

No discovery phase — jumping to quotes without understanding your product
Portfolios without live, downloadable app examples or verifiable client references
Mobile app developers who agree with every requirement without pushing back on scope
Vague IP ownership language is buried in contracts
Cross-platform app development companies that don't disclose technology choices or their trade-offs
Unusually low pricing without explanation — a common signal of offshore code farms with no senior oversight
No defined process for handling bugs, delays, or mid-project scope changes

Mobile App Development

OTT App Development Guide for 2026: Cost, Features, Process & Tech Stack

OTT app development in 2026: real costs, tech stack picks, must-have features, and the 5 mistakes that derail even well-funded launches.

Updated on : August 26, 2026

Mobile App Development

Legacy Application Modernization: The Complete Guide for Enterprises in 2026

Explore legacy application modernization strategies, 7 Rs, costs, process, AI, challenges, and best practices for modernizing enterprise applications in 2026.

Updated on : August 25, 2026

Mobile App Development

Mobile App Development in Australia: 2026 Cost Breakdown

Mobile app development in Australia can cost AUD 30,000–300,000+. See the 2026 cost breakdown by app type, platform, developer rates, and more.

Updated on : August 24, 2026

Read all research articles

The Magical Quadrant

Hover any bubble for the firm's exact scores. Filter the view using the controls on the right.

360-PERFORMANCE VIEW (Y) →

0255075100

Industry ContendersIndustry LeadersUpcoming AchieversMarket Influencers

0255075100

CORE COMPETENCIES (X) →

The four quadrants explained

Each card shows the count of firms in that quadrant and the top 5 by composite score.

Industry Leaders

Top-right · Both axes ≥ 50

112FIRMS

Strong on both Core Competencies and 360-Performance. These firms have proven track records, deep specialisation, and solid client outcomes. Default recommendation for most buyers.

Top 5 by composite score

1Chop Dawg74 / 85 2TechGropse Pvt. Ltd.79 / 65 3DigiNeat Smart Technologies88 / 55 4Uplogic Technologies Pvt Ltd84 / 55 5AppsNation75 / 61

Industry Contenders

Top-left · Y ≥ 50, X < 50

122FIRMS

Strong execution but broader service mix. High-quality generalists - good fit if your project crosses multiple disciplines in one engagement.

Top 5 by composite score

1Promatics Technologies47 / 69 2NipsApp Game Studios46 / 68 3Sparx IT Solutions Pvt Ltd49 / 63 4Empat48 / 63 5Mobiloitte Technologies Pvt Ltd50 / 61

Market Influencers

Bottom-right · X ≥ 50, Y < 50

529FIRMS

Deeply specialised but with moderate market presence. Often the right pick when specialisation matters more than scale - boutique shops with deep technical chops.

Top 5 by composite score

1SunSmart Technologies100 / 45 2AOX Apps® 100 / 44 3HBit Technology100 / 42 4TEKIT SOLUTION96 / 46 5W2SSolutions100 / 40

Upcoming Achievers

Bottom-left · Both axes < 50

2,168FIRMS

Newer entrants and smaller boutiques. Higher risk but often the best price-performance - particularly for early-stage startups or non-mission-critical projects.

Top 5 by composite score

1CodeChaps Technologies Pvt. Ltd.49 / 50 2App Maisters Inc48 / 50 3Cerebrum Infotech50 / 47 4SimbirSoft47 / 50 5Unified Infotech48 / 49

The Industry Leaders in detail

The 8 highest-scoring firms in the Industry Leaders quadrant. Each has both Core Competencies and 360-Performance ≥ 50. Click any card for the full profile.

1LEADER

Chop DawgSponsored

5.0117 reviews

Visit Website

$25 - $4950 - 2492009Toronto, Ontario, Canada

Core Competencies74

360-Performance85

2LEADER

TechGropse Pvt. Ltd.

4.957 reviews

Visit Website

< $2550 - 2492015Dubai, Dubai, UAE

Core Competencies79

360-Performance65

3LEADER

DigiNeat Smart Technologies

5.027 reviews

Visit Website

$50 - $9950 - 2492022Yerevan, Yerevan, Armenia

Core Competencies88

360-Performance55

4LEADER

Uplogic Technologies Pvt Ltd

4.935 reviews

Visit Website

< $2510 - 492017Madurai, Tamil Nadu, India

Core Competencies84

360-Performance55

5LEADER

AppsNation

4.920 reviews

Visit Website

$50 - $9950 - 2492016Karachi, Sindh, Pakistan

Core Competencies75

360-Performance61

6LEADER

Probey ServicesSponsored

5.031 reviews

Visit Website

< $25250 - 9992016Asker, Akershus, Norway

Core Competencies62

360-Performance72

7LEADER

You are launchedSponsored

5.021 reviews

Visit Website

$25 - $4910 - 492016Limassol, Limassol, Cyprus

Core Competencies75

360-Performance59

8LEADER

Young Decade IT Software Solut...

5.0101 reviews

Visit Website

< $2510 - 492014Indore, Madhya Pradesh, India

Core Competencies69

360-Performance65

View all companies

How firms are placed on the matrix

Every position on this chart is the output of the Goodfirms ranking algorithm - a weighted composite of signals across two axes. The algorithm is recomputed regularly and is fully documented.

Sponsorship does not affect placement. PRO members receive visible badges and ad placements, but their algorithmic scores are calculated identically to free listings.

Read the full methodology

Algorithm at a glance

X-axis (Core Competencies): Service Focus Ratio + Portfolio Depth + Quality + Experience

Y-axis (360-Performance): Client Reviews + Market Presence + Goodfirms Score

Missing signals are excluded from a firm's score, not substituted with defaults - weights redistribute across remaining inputs

Recency decay over the last 18 months keeps stale reviews from dominating

Eligibility floor: ≥ 1 published review in this category scope

5 countries with the best Value Score for hiring.

Ranked by a composite blending firm count (supply), average rating (quality), and average hourly rate (cost). Affordability is weighted highest (50%), so this surfaces genuinely affordable destinations - not just the biggest markets.

IN★ TOP PICK

India

Home to 10,148 vetted firms, with an average rate of $38/hr and a 4.9★ client rating.

Pakistan

Home to 1,029 vetted firms, with an average rate of $44/hr and a 4.9★ client rating.

Ukraine

Home to 493 vetted firms, with an average rate of $43/hr and a 4.9★ client rating.

Belarus

Home to 71 vetted firms, with an average rate of $38/hr and a 5★ client rating.

Vietnam

Home to 251 vetted firms, with an average rate of $38/hr and a 4.9★ client rating.

Firms251

Avg Rate$38/hr

Value Score83 / 100

Where the firms are.

Bubble size shows how many firms each country has; colour shows its average hourly rate. Tap any country for its firm count, average rate, rating, and Value Score.

Loading map…

Average hourly rates by region.

Where you hire affects what you pay by up to 3×. Comparable quality is available across regions - the rate gap between the priciest and cheapest is the single biggest lever on a project budget.

Average hourly rate · USD

AUOceania$73/hr$73

USNorth America$65/hr$65

GBWestern Europe$65/hr$65

ZAAfrica$56/hr$56

MXLATAM$52/hr$52

UAEastern Europe$51/hr$51

SGAsia Pacific$50/hr$50

INSouth Asia$39/hr$39

What the gap actually buys you

The rate gap between the highest- and lowest-cost regions is largely a cost-of-living and labor-market gap - not a quality gap. Top-tier firms in lower-cost regions routinely deliver work competitive with premium markets at a fraction of the cost.

That said, time-zone overlap, language alignment, and IP protection vary by region. Eastern Europe and LATAM hit a sweet spot: meaningful cost savings with same-day overlap for US/EU clients.

~70%

Typical cost savings when moving a $100K/year dev contract from a premium market to a top value destination - comparable skill, comparable delivery quality.

All countries ranked by Value Score.

Every country with 100+ vetted firms in this category, ranked by Value Score.

Country	Firms	Avg Rate	Avg Rating	Value Score	Action
INIndia	10,148	$38/hr	4.9	89	View firms
PKPakistan	1,029	$44/hr	4.9	84	View firms
UAUkraine	493	$43/hr	4.9	83	View firms
VNVietnam	251	$38/hr	4.9	83	View firms
BDBangladesh	342	$44/hr	4.9	83	View firms
NPNepal	105	$40/hr	5	83	View firms
PLPoland	438	$54/hr	5	82	View firms
LKSri Lanka	124	$40/hr	4.9	82	View firms
EEEstonia	113	$51/hr	5	81	View firms
GBUnited Kingdom	1,184	$59/hr	4.9	81	View firms
ESSpain	144	$51/hr	5	81	View firms
USUnited States	5,149	$66/hr	4.8	80	View firms
RURussia	123	$45/hr	4.9	80	View firms
AEUAE	644	$57/hr	4.9	80	View firms
KEKenya	113	$48/hr	4.9	80	View firms
EGEgypt	152	$49/hr	4.9	80	View firms
RORomania	191	$53/hr	4.9	79	View firms
CACanada	678	$58/hr	4.8	78	View firms
MYMalaysia	132	$54/hr	4.8	77	View firms
TRTurkey	157	$62/hr	4.9	77	View firms
SGSingapore	124	$63/hr	4.9	76	View firms
AUAustralia	565	$72/hr	4.9	76	View firms
DEGermany	223	$70/hr	4.9	75	View firms
IDIndonesia	102	$58/hr	4.8	75	View firms
ZASouth Africa	132	$67/hr	4.9	75	View firms
NLNetherlands	113	$73/hr	4.9	73	View firms
NGNigeria	105	$67/hr	4.8	73	View firms
FRFrance	116	$71/hr	4.7	70	View firms

INIndia

10,148 firms$38/hr4.9

Value Score89 / 100

Top Mobile App Development Companies

Top 10 at Glance

List of the Best Mobile App Development Companies (iOS & Android)

Using AI Tools

Why Invedus Outsourcing?

Using AI Tools

Why YUAL, Inc?

Post your project. Get proposals from PRO-verified firms.

Why Trust Goodfirms

Humanly-Vetted Client Reviews

Data-Driven Rankings

Global Trust & Recognition

Transparency In Detail

Frequently Asked Questions

Who are the top mobile app development companies?

How to choose the top mobile app development agency?

How much does it cost to hire a mobile app development firm?

How can I find an app development agency that fits my budget?

What questions should I ask before hiring a mobile app development provider?

Should I hire an in-house developer or outsource to a mobile app development agency?

How long does it take to develop a mobile app?

What services do mobile app development providers offer?

What types of apps do mobile app development companies build?

What technologies do top app development companies use?

What are AI-driven mobile app development services?

What red flags should I watch out for when hiring a mobile app development company?

Specialized Service Providers

Trending insights from Goodfirms

The four quadrants explained

Top 5 by composite score

Top 5 by composite score

Top 5 by composite score

Top 5 by composite score

How firms are placed on the matrix

5 countries with the best Value Score for hiring.

India

Pakistan

Ukraine

Belarus

Vietnam

Where the firms are.

Average hourly rates by region.

Average hourly rate · USD

What the gap actually buys you

All countries ranked by Value Score.

Match by work-hour overlap with your team.

How firms are placed on the matrix

Found your target region?

Countries with the best Value Score for mobile app development hiring.

Top 15 recommended companies by Value Score.

How the heatmap is built

Found your target region?