Mobile app development company that builds apps which cross 3M+ installs
We build mobile apps for iOS and Android — native (Swift/Kotlin) or cross-platform with Flutter. From an MVP in 6-8 weeks to a product that scales. 15 years of iOS development. 20+ apps in production. 3M+ combined downloads.
Which stack to choose for your app
There is no “best” technology — there is the right one for the job. At discovery we recommend a specific stack for your budget, timeline and performance needs. Each direction has its own in-depth page.
Flutter cross-platform →
One codebase for iOS and Android — roughly 30% saved on budget and time. Ideal for B2B SaaS, e-commerce, marketplaces, service platforms and MVPs. We’ve worked with Flutter since its first releases.iOS development (Swift) →
Native iOS apps in Swift — top performance and full access to the system. For AR, games, heavy 3D graphics and demanding hardware integrations. 15 years of experience.Android development (Kotlin) →
Native Android apps in Kotlin — for the largest device market. Work with the device matrix, background processes and integrations. We prepare and support the Google Play release.Cost calculator →
Not sure about budget? Estimate an approximate cost in 2 minutes — pick the platform, features and design and get a range plus a per-stage breakdown.How we build an app end-to-end: from idea to release
Sprint-based delivery — weekly demos, you see progress every 7 days. No “just one more month”.
Discovery + spec (2-3 weeks)
Founder interview, market analysis, user stories, technical architecture. We fix the MVP / v2 / v3 scope and form a roadmap. We recommend a stack for the job and the budget.UI/UX design (3-5 weeks)
Wireframes → Figma prototype → high-fidelity mockups. We test with 3-5 real users before development — it’s cheaper to fix in a mockup than in code.Development (50-60% of budget)
Clean architecture, code review on every PR, test coverage. You own the code and see every commit in GitHub from day one.QA + testing
Functional, regression, performance testing and a security audit on popular devices. We catch bugs before your users do.Release + support
Submission to the App Store and Google Play, ASO, handling rejections. We prepare for review and support the app through to publication. First 30 days of support are free.What’s included in our mobile app development services
Discovery & technical architecture
Scope, user stories, stack choice and a delivery roadmap with budgets and milestones.UI/UX design
From wireframes to a full design system. Testing with real users. An interface that helps users reach their goals fast.Native & cross-platform builds
Swift, Kotlin or Flutter — the right tool for your product, not a one-size-fits-all template.Backend + integrations
REST/GraphQL, databases, payments, push, geolocation, chats, offline sync, CRM/ERP.QA + security audit
Functional, regression, performance and security testing across the device matrix.Publishing + ASO
App Store & Google Play submission, store-page optimisation, launch promo. We support moderation and quickly fix any review notes.Apps we build by industry
Cross-platform or native — chosen by what the product actually needs.
Fintech & banking
Banking apps, wallets, crypto. Security comes from architecture, not the language — so fintech runs perfectly on Flutter as well as native.E-commerce & marketplaces
Catalogue, cart, payments, profiles, push. Cross-platform is the sweet spot here.Healthcare
Booking, telemedicine and secure exchange of medical data with industry privacy requirements in mind.SaaS & internal tools
CRM, ERP, communication platforms, client portals. Sadok.app — our own SaaS, live in 3 countries.Utility & AR
WiFi Heatmap (3M+) and Wi-Fi AR (2M+) — computer vision, AR and real-time data on a phone.On-demand & delivery
Orders, real-time tracking, driver and customer apps — high-load logic without bloating the budget.Why companies choose us for mobile app development
A transparent process, fixed timelines and a result you see before development even starts.
Timeline
We forecast the development timeline accurately. We finish 80% of projects ahead of schedule.
Cost
We build an interactive prototype. Better to spend 10% of the budget on a prototype than 130% on a product you’ll have to redo.
Control
We keep you informed at every stage and report 2-week interim results.
Responsive design
Clean UX/UI-driven design, visualised already at the prototype stage.
Payment
We set a payment schedule that’s convenient for both sides.
Result
We test the app, publish it to the store and push it to the TOP.
Mobile app development cost & timeline
The final cost is hard to define without a preliminary product estimate. We have been building apps for iOS, Android and VR/AR since 2011. 50+ successful projects. Prototype in 2 weeks.
| Project type | Examples | Screens | Platform | Timeline | Cost | What’s included |
|---|---|---|---|---|---|---|
| MVP / Startup | Business card, catalog, promo app | 5-10 | Android or iOS | 1-2 mo | from $5,000 | Basic UI/UX, simple backend, 1-2 integrations, testing, publishing, 1 mo warranty |
| MVP cross-platform | Business card, catalog on Flutter | 5-10 | Android + iOS | 1.5-2 mo | from $6,000 | One codebase for both platforms, ~30% savings, basic design, publishing to both stores |
| Mid-size project | Online store, delivery service, loyalty app | 15-30 | Android or iOS | 2-4 mo | from $15,000 | Custom UI/UX, mid backend, 3-5 integrations (payment, CRM), 2 mo warranty |
| Complex project | Marketplace, fintech, services aggregator | 30-50 | Android + iOS | 4-6 mo | from $30,000 | Premium UI/UX, complex backend, 5+ integrations, user accounts, analytics, 3 mo warranty |
| VR/AR app | Augmented reality, virtual tours, training | 10-30 | Android or iOS | 3-6 mo | from $20,000 | 3D modeling, AR/VR engine, performance optimization, on-device testing |
| Enterprise | Corporate CRM/ERP, internal systems | 50+ | Android + iOS | 6-12 mo | from $50,000 | Full development cycle, integration with corporate systems, training, 3+ mo support |
For an exact figure for your task, use the calculator — it takes 2 minutes.
Technologies we use for mobile app development
Java
One of the most popular languages for Android. OOP, reliability and a large library ecosystem.Swift
The language for iOS and macOS apps. Products stand out for security, usability and high speed.Kotlin
A modern language for Android (with Kotlin/Native for cross-platform logic). Officially recommended by Google.Flutter
A framework for Android, iOS and Fuchsia in the Dart language. One codebase for both platforms, performance close to native.React Native
A cross-platform framework (iOS, Android, Windows) in JavaScript — reusing code across platforms.Our team
We’ve built mobile apps for business since 2011. Over 14+ years — 50+ successful large-scale projects, from MVP startups to corporate solutions.
Yevhenii Chyzh — Founder
Founder of the digital agency since 2011. 14+ years in digital products and internet marketing.Serhii Kolodynskyi — Head of Mobile Development
10+ years of mobile development. Expert in Java, Flutter, Swift, Kotlin. High-load apps, IoT, banking and fintech solutions.Mykola Tabuchenko — Senior iOS Developer
15 years of iOS development — since the first iPhone. Flutter since its first releases. 20+ live apps.Serhii Diachenko — Head of Design
8+ years in UI/UX design. Apple Human Interface Guidelines, Material Design 3. Design systems and interactive prototypes.Andrii Zahorodnii — Head of PM
Certified Agile/Scrum specialist. 30+ projects from concept to release. Control of timelines, budget and quality.Karina Fedorova — CMO
ASO optimisation and growth marketing. App Store and Google Play promotion strategies.Recent mobile work
Sadok.app
A cross-platform CRM for nurseries and parents — from architecture to release.
UkrAvit
A native B2B app for the agro sector — iOS+Android with integrations.
WiFi Heatmap
An Android app for Wi-Fi diagnostics — complex mesh analytics.
Reviews from clients we’ve built mobile apps for
Khvylya Zdorovya · healthcare
“The app gives users a simpler way to place orders — many prefer the mobile option. The delivery process is almost fully automated.”International logistics company
“CHYZH Agency developed an effective approach to project management. The team finds answers fast and strictly meets deadlines.”Gas & energy company
“Two months after launch, the number of iOS and Android users grew significantly. Seamless communication via messengers and Zoom.”Frequently asked questions
What does turnkey (full-cycle) mobile app development include?
Turnkey development is the full cycle of building an iOS and Android app from idea to launch: spec, design, development, testing, release to the App Store and Google Play, and ongoing support. You get a finished product in the stores and full ownership of the code — with no lock-in to the contractor.
How much does mobile app development cost?
The real 2026 range is $1,000–$30,000+. An MVP for one store starts at $1,000. A full Flutter product with backend is $5,000–$15,000. A native iOS+Android enterprise app is $15,000+. Our calculator gives an exact figure in 2 minutes.
How long does development take?
An MVP takes 4-8 weeks. A mid-level product is 3-5 months. A complex enterprise app with native development is 6-9 months. Weekly demos let you see progress every 7 days.
Native or cross-platform (Flutter) — what should I choose?
Flutter saves around 30% of budget and time, with performance 5-15% lower. Native is worth it for AR/VR, heavy 3D games and direct hardware integrations. Fintech, banking and crypto run perfectly on Flutter (PrivatBank is built on it). For 80% of business apps Flutter is optimal; we’ll advise specifically for your case at discovery.
Do you offer offshore / outsourced app development?
Yes — we’re a full-cycle mobile team working with clients internationally. One team, your IP, transparent GitHub access from day one — without the overhead of an in-house department.
Who owns the code after delivery?
You do. Full GitHub access from day one; all IP rights transfer to your company after the final milestone is paid.
Can we start with an MVP and add features later?
Yes — that’s our recommended approach. An MVP for $1-5k in 4-8 weeks, launch, gather real data, then quarterly sprints of $1-3k. You pay only for what’s validated.
Do you help pass App Store and Google Play moderation?
Yes. In 15 years with the App Store / Google Play we know the typical rejection reasons, prepare the app for submission and support the process. If it’s rejected because of our mistake, we fix it for free.
What does the cost of mobile app development depend on?
On the number of screens and feature complexity, the platform, design uniqueness and required integrations. We give an exact estimate after a short discovery.
Which companies is a mobile app right for?
Almost any modern business, especially e-commerce, services with repeat purchases and companies with a complex sales cycle. An app boosts loyalty and convenience for customers.
What types of mobile apps are there?
Business apps, promo apps, games, utilities, and AR/VR/MR apps — depending on the product’s goal.
What are VR, AR and MR apps?
VR is virtual reality — glasses with a smartphone immerse you in a virtual world. AR is augmented reality — virtual elements added to the real world (like our Wi-Fi AR). MR is mixed reality — interacting with virtual objects in the real world.
Can I track the development?
Yes. At any time you see the process: Android/iOS test builds, GitHub access and 2-week interim results.
A word from the person who’ll lead your build
“Most mobile estimates fail because studios are afraid to tell the client the truth. I’ve written code for 15 years and seen 20+ apps go from MVP to 3M+ downloads. An honest budget, realistic timelines and clear trade-offs — that’s what professionalism in mobile actually is.
Mykola TabuchenkoSenior iOS Developer · chyzh.agency · 15 years iOS · Flutter since first releases · 20+ live apps · practice led by Serhii Kolodynskyi, Head of Mobile Dev
Individual development directions
Each technology is a separate page with details, cases and when to choose it.
Flutter cross-platform →
One codebase for both platforms. Around 30% saved on budget.iOS development (Swift) →
Native iOS apps. Top performance and security.Android development (Kotlin) →
Native Android apps for the largest device market.Cost calculator →
Estimate your app’s budget in 2 minutes.Ready to discuss your app?
A free 30-minute discovery call with Mykola and a PM. We’ll outline 3 scope options at different budgets and tell you honestly which stack fits you. No commitment.
Or email us directly: info@chyzh.agency