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 1 month to a product that scales. 15 years of iOS development. 20+ apps in production. 3M+ combined downloads.
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 $3,000–$30,000+. An MVP for one store starts at $3,000. 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 1 month. 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 $3-5k in 1 month, 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. Working with the App Store / Google Play since 2011, 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.