You want a real app in your users' hands and live in the stores, not another Figma prototype that never ships. As a mobile app development company in Poland, that is the only thing I get paid for: an iOS and Android app people can actually download this quarter, built from one codebase so you never fund two separate native teams. One senior developer, a fixed quote, a release date, and code you own from day one.
Most people who write to me start with the same fear: "won't I have to pay for two apps?" No. That is the whole point of how I build.
What you get from mobile app development in Poland
Concrete deliverables, not a wish list:
- One React Native (Expo) codebase that compiles to genuine native iOS and Android apps. Around 90% of the code is shared, so you pay once and maintain one thing.
- Native feel. Real gestures, smooth transitions, dark mode, haptics, offline support. Users should not be able to tell it is cross-platform, and they can't. Instagram, Discord and Shopify run on React Native.
- Push notifications wired up on both platforms from launch.
- Payments and subscriptions. One-off purchases and checkout via Stripe, in-app subscriptions through RevenueCat (it handles Apple and Google billing in one place), and BLIK where a web payment flow makes sense.
- Backend and API. Auth, database, admin panel on Supabase/Postgres so you manage content and users yourself.
- UX/UI design that fits your brand, not a stock template.
- App Store and Google Play publishing included. I prepare the store listings, screenshots, privacy answers and submit. Publishing is in the price, not an extra line item later.
- Post-launch support and updates so the app keeps working when Apple and Google ship their yearly OS versions.
Why hire one senior developer instead of an app agency in Warsaw
I am one senior full-stack developer based in Warsaw, working with clients across all of Poland remotely and internationally. When you hire me, you talk to the person writing the code, not an account manager who forwards your messages to a junior.
Three things I put in writing before we start:
- You own the code. The Git repository is created in your name or your company's from commit one. No lock-in, no "hostage" situation if we stop working together.
- You own the store accounts. Apple Developer and Google Play Console are registered under your business, not mine. The app is legally yours, listed under your name.
- Fixed quote and a release date. After a 30-minute discovery call I send a fixed price and a real launch date within 24 hours. No open-ended hourly meter.
Being solo has an honest downside: one person is one person, so I take a limited number of projects at once. That is also why the price is lower than an agency - there is no office, no sales team, no margin stacked on top of the build.
Proof: a fitness app shipped to the App Store
The best answer to "can you actually get it published?" is an app that is already live. Body Forge is an AI fitness coach I designed, built and shipped to the App Store in Poland end to end.
During a workout the screen shows only what you need between sets - last week's numbers, a rest timer, one tap to log a set. After the session an AI coach on GPT-4o reads the whole workout and writes a personal analysis in about 10 seconds ("stalled on incline press three weeks running, deload to 80% next week"). It has a library of 200+ exercises with video form demos and Apple Health integration.
Body Forge is native SwiftUI, because deep HealthKit access and performance justified it. That is the honest rule I work by: cross-platform React Native by default to save you money, native only when the app genuinely needs it. Either way, the case proves the part clients actually worry about - I take an app all the way through Apple review and into the store, not just to a demo build.
Mobile app development cost in Poland
Here is what real projects cost, in PLN and euro, so you can plan a budget instead of guessing from an agency's "it depends."
| Type | What's included | Price | Timeline |
|---|---|---|---|
| MVP | 1 app for iOS + Android, 5-8 screens, auth, basic backend, published to both stores | from 13,000 zł (€3,000) | 4-8 weeks |
| Standard product | Payments (Stripe / RevenueCat), push, profiles, content feed, admin panel, analytics | 26,000-65,000 zł (€6,000-15,000) | 8-14 weeks |
| Complex app | Real-time chat, maps/geolocation, offline sync, roles, CRM/ERP integrations | 65,000 zł+ (€15,000+) | 14-24 weeks |
On top of development there are fixed costs everyone forgets: Apple Developer is $99/year, Google Play Console is a one-time $25, and backend hosting runs €0-50/month at launch on Supabase or Railway free tiers, growing with usage. Budget 15-20% of the build per year for maintenance.
Where cost blows up with other providers is the "two apps" trap - paying a Swift developer for iOS and a Kotlin developer for Android to build the same features twice. One React Native codebase removes that entirely and cuts the bill by 40-60% against native.
Objections, handled straight
"Apps always overrun budget and timeline." They overrun when the scope is vague. I fix the scope, price and release date before writing code, so a change of mind becomes a clear add-on, not a surprise invoice.
"What if Apple rejects the app?" First submissions do sometimes bounce on something small (privacy text, a login requirement, a metadata detail). I know the common rejection reasons, submit correctly the first time, and build one or two review iterations into the plan. Rejection is a step, not a disaster.
"Who is stuck maintaining it?" You choose. Because you own the code and the accounts, you can keep me on a light support retainer or hand the repo to an in-house developer later. No lock-in either way.
"Freelancer or agency?" For a defined app with a clear goal, a senior freelancer ships a better result for less money and you talk to the builder directly. An agency makes sense when you need a large team running for years in parallel. If that is you, I will tell you honestly.
Built for the Polish market
Serving clients across Poland remotely means I build with local reality baked in. Payments cover BLIK and Przelewy24 where a web checkout fits, alongside Stripe and native in-app subscriptions. Everything is GDPR-RODO compliant from the design stage: consent, data handling, and storage on EU-side infrastructure, plus a privacy policy that passes App Store and Google Play review. I invoice with faktura VAT and work on a B2B contract, so the cost goes cleanly through your firm - whether you run a jednoosobowa działalność or a sp. z o.o.
Cross-sell: the full stack around your app
An app rarely lives alone. I also build the website or web app and backend behind it - the marketing site, the admin dashboard, the same API feeding both mobile and web. If you want to validate demand before committing to a full app, a Telegram mini app is a lighter, cheaper way to put a working product in front of users inside a chat, then graduate to native once the numbers justify it. And if your app needs AI features like Body Forge's coach, I build AI agents straight into the product.
FAQ
How much does it cost to build a mobile app in Poland? An MVP for iOS and Android starts at 13,000 zł (€3,000) and ships in 4-8 weeks with publishing included. A standard product with payments, push and an admin panel runs 26,000-65,000 zł (€6,000-15,000), and complex apps start at 65,000 zł. You get a fixed quote for your exact scope within 24 hours of a discovery call.
Native or cross-platform (React Native / Flutter) - which is better? For roughly 90% of business apps, cross-platform React Native is the right call: one codebase for iOS and Android, one budget, one thing to maintain, and a native feel users can't distinguish. Native (Swift/Kotlin) only pays off for heavy graphics, games, or deep hardware access. I default to React Native and go native only when the app truly needs it.
How long does app development take? An MVP takes 4-8 weeks, a standard product 8-14 weeks, and a complex app 14-24 weeks. The timeline is fixed with the scope before we start, and it includes App Store and Google Play submission, not just the build.
Do you publish the app to the App Store and Google Play? Yes, publishing to both stores is part of every project, not an extra. I prepare the listings, screenshots and privacy answers, submit for review, and handle the one or two iterations Apple sometimes asks for. The accounts are registered under your business.
Do I own the code and the app accounts? Completely. The Git repository is in your name from the first commit, and the Apple Developer and Google Play accounts are registered to your company. There is no lock-in - you can move the project to another developer any time you want.
Do you handle updates and maintenance after launch? Yes. iOS and Android release new OS versions every year, so I keep the app compatible on a light support retainer, typically 15-20% of the build cost per year. Because you own the code, you can also bring maintenance in-house whenever it suits you.
Every week you wait is a week your competitor's app is in the store and yours is not. I take a limited number of projects at once, so slots are real. If you want an iOS and Android app shipped this quarter, see mobile app development or write to me today - within 24 hours you'll have a fixed quote, a release date, and your place in the queue.
