App development company in Warsaw
Mobile app development for Warsaw companies: iOS, Android and web apps in Polish and English, from first brief to App Store and Google Play release, built by one dedicated team.
- Custom quote after a brief
- No sales pitch
Company-wide:★★★★★ 4.9+ on Clutch·250+ brands·10 offices
UnFoldMart is an app development company, or software house as many Polish buyers call it, with an office at plac Europejski 1, 00-844 Warszawa. We design and build iOS, Android, cross-platform (Flutter, React Native) and web apps for Warsaw companies, in Polish and English, from discovery to store release and support, with one small dedicated team led from our international offices. Meetings with Warsaw clients are by video in English, and pricing is a custom quote after a short brief and a free 30-minute call.
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Key facts
| Service | Mobile and web app development: iOS, Android, cross-platform (Flutter, React Native), web apps and PWAs, backend and store release |
|---|---|
| Company | UnFoldMart |
| Office | plac Europejski 1, 00-844 Warszawa, Poland |
| Meetings | By video (in-person meetings only at our Frankfurt and Zürich offices) |
| Languages | First call in English; project calls by video in English |
| Time zone | Central European Time (CET/CEST); project teams are led from our international offices |
| Typical timeline | Discovery 1–3 weeks · design 2–5 weeks · first version 8–16 weeks · testing and store release 1–3 weeks (ranges, not guarantees) |
| Pricing | Custom quote after a short brief: fixed-scope project or ongoing product team. No price list. |
| Booking | Free 30-minute video call ↗ |
| Company-wide | 10 offices in 10 markets · 250+ brands · 500+ projects · 4.9+ on Clutch · 8 working languages |
Mobile app development for Warsaw companies
Warsaw is Poland's capital and its largest business centre, with banks, fintechs, e-commerce companies and many international business-service centres. Polish users are used to fast mobile banking and mobile payments.
Warsaw at a glance
- IndustriesBanking, fintech, e-commerce, logistics, business services, SaaS
- Data lawGDPR, supervised in Poland by the UODO
- PaymentsBLIK, pay-by-link bank transfers, cards, wallets
- LanguagesPolish and English
- Time zoneCET in winter, CEST in summer
Banking and fintech
Account, onboarding and payment apps with security built in.
E-commerce and retail
Shopping, loyalty and delivery apps.
Business services and B2B
Portals and internal tools for teams across countries.
What our Warsaw app developers build
iOS and Android app development, Flutter and React Native apps, web apps and the backend behind them, in Polish and English.
iOS and Android apps
Swift and Kotlin, full device access.
Cross-platform apps
One React Native or Flutter codebase.
Web apps and PWAs
Portals and tools, no store needed.
Backend, APIs and integrations
Accounts, payments, CRM, ERP.
MVPs and first versions
Test your idea with real users.
Takeover and support
Review, fixes, upgrades, rebuilds.
Native, cross-platform or web app?
Native iOS app development in Swift, Android in Kotlin, or one Flutter or React Native codebase. We recommend one in discovery.
| Native | Cross-platform | Web app / PWA | |
|---|---|---|---|
| Code | Swift (iOS) and Kotlin (Android) | One codebase: Flutter or React Native | One codebase: TypeScript, React |
| Performance and device features | Best; full device access | Very good for most apps | Good; limited device access |
| Time to both stores | Longest: two apps | Usually faster | No store needed |
| Best for | Demanding, device-heavy apps | Most business and consumer apps | Portals and internal tools |
Apps we can build
Common app types; illustrative screens, not client work.
Booking and scheduling
Pick a slot, pay, get reminders.
Shop and loyalty app
Browse, buy, collect points.
Customer portal
Orders and documents, one login.
Field-service tool
Jobs and checklists on site.
Marketplace
Two sides meet and book.
Finance dashboard
Balances and reports at a glance.
- Chat assistant
- Smart search
- Document reading
- Recommendations
How we work
From brief to store release, with a working build at every stage.
- 1BriefScope and quote
- 2PrototypeClickable design
- 3SprintsDemo every two weeks
- 4Store releaseApp Store · Google Play
Timeline
| Phase | Typical duration | You get |
|---|---|---|
| Discovery and scope | 1 to 3 weeks | Written scope and quote |
| UX and UI design | 2 to 5 weeks | Clickable prototype |
| Build in sprints | 8 to 16 weeks for a first version | Test build every sprint |
| Testing and store release | 1 to 3 weeks | Real-device and security testing, store submission |
| Support and next versions | Ongoing, as agreed | Monitoring, updates, next versions |
Typical ranges in weeks, not a guarantee.
How to choose a software house in Warsaw
Six checks before you sign, whether you hire a software house, a freelancer or your own team.
Platform fit
Ask which approach they recommend (native, Flutter, React Native or web) and why.
UnFoldMart: We recommend one in discovery.
A written scope and quote
What is in, what is out, and how changes are priced.
UnFoldMart: Scope, timeline and price in writing.
A visible process
A clickable prototype first, then demos and test builds you can install.
UnFoldMart: A demo after every two-week sprint.
Security and data protection
How data is protected and tested before release.
UnFoldMart: OWASP MASVS, security testing before launch.
Store release and ownership
Who submits to the App Store and Google Play, and who holds the accounts and code.
UnFoldMart: App Store and Google Play submission is part of our release step.
Support after launch
Updates for new iOS and Android versions, monitoring and a clean handover option.
UnFoldMart: Support agreed in your quote.
Agency, freelancer or in-house team?
| App agency | Freelancer | In-house team | |
|---|---|---|---|
| Skills | Design, build, testing and release in one team | Usually one specialism | The roles you hire |
| Start | After scope and quote | Often quick | After hiring |
| Continuity | Team covers absences and handover | Depends on one person | High while the team stays |
| Your management effort | Low to medium | Medium to high | High |
| Cost model | Project quote or monthly team | Hourly or daily rate | Salaries, hiring and tools |
| Best for | A full app, start to finish | A defined, smaller task | A long-term core product |
What affects the cost
No price list. Your quote depends on these factors.
- PlatformsiOS, Android, web.
- Screens and featuresHow many, how complex.
- IntegrationsPayments, CRM, ERP.
- Design depthStandard or custom.
- TimelineYour launch date.
- Two languagesPolish and English text, layouts that fit longer Polish words and testing in both languages add time.
Ways to work with us
Fixed-scope project
Scope and price in writing.
Ongoing product team
A dedicated team, monthly.
Discovery first
A scope you can use anywhere.
How quoting works
- Short briefWhat and for whom.
- Free 30-minute callBy video, in English.
- Written estimateScope, timeline, price.
- You decideNo obligation.
GDPR, the UODO and accessibility
This is general information, not legal advice. Your legal adviser has the final word.
GDPR
The EU General Data Protection Regulation applies directly in Poland. We plan lawful basis, consent, data minimisation and deletion into the app from the first sprint.
Official source: GDPR (EUR-Lex) ↗Polish Data Protection Act and the UODO
Poland's Act of 10 May 2018 on the Protection of Personal Data supplements the GDPR. The Personal Data Protection Office (UODO) is the Polish supervisory authority and publishes guidance for organisations.
Official source: uodo.gov.pl ↗European Accessibility Act
Since 28 June 2025, the European Accessibility Act, implemented in Polish law, sets accessibility requirements for many consumer services, such as e-commerce and consumer banking, including their apps. We design and test against WCAG 2.2.
Official source: Directive (EU) 2019/882 (EUR-Lex) ↗Public standards we align our work to
Working with us from Warsaw
One dedicated team; projects are led by UnFoldMart from our international offices.
Our Warsaw office
plac Europejski 1, 00-844 Warszawa
By video
Workshops, demos and weekly check-ins by video.
Language
Calls and project work in English.
Time zone: Central European Time (CET/CEST)
Office-hours overlap: –
09:00–18:00 local time in both offices. Same time zone as our Frankfurt, Amsterdam, Zürich, Paris and Madrid offices.
Company-wide figures across all our services, not app projects.
- Zürich · in person
- Frankfurt · in person
- London
- Amsterdam
- Paris
- Madrid
- Warsaw
- Singapore
- Vancouver
- Gurugram
Frequently asked questions
App development in Warsaw: before you book a call.
Do you have an office in Warsaw?
Yes. UnFoldMart's Warsaw office is at plac Europejski 1, 00-844 Warszawa. Workshops, design reviews and weekly check-ins with Warsaw clients take place by video, in English.
Are you a software house?
Yes, in the sense Polish buyers use the term: we design, build, test and release custom apps and the backend behind them, with one dedicated team. Our app work covers iOS, Android, cross-platform and web apps.
How much does it cost to build an app in Warsaw?
Pricing is custom. Cost depends on platforms, screens and features, integrations, design depth, compliance needs and your timeline. After a short brief and a free 30-minute call, you get a written estimate.
How long does it take to build an app?
Typically: discovery 1 to 3 weeks, design 2 to 5 weeks, build 8 to 16 weeks for a first version, testing and store release 1 to 3 weeks. These are ranges, not guarantees.
Should we build a native app or use Flutter or React Native?
Native (Swift for iOS, Kotlin for Android) suits top performance and deep device features. Cross-platform (Flutter or React Native) shares one codebase and usually reaches both stores faster. We recommend one in discovery.
Can the app be in Polish and English?
Yes. We set up the app for both languages from the start, so adding or changing text later is a content task, not a rebuild. Polish is one of our eight working languages.
Can you connect BLIK and other Polish payment methods?
Yes. BLIK is widely used for mobile payments in Poland, alongside pay-by-link bank transfers, cards and wallets. We connect the methods your payment provider supports.
How do you handle the GDPR in Poland?
We plan lawful basis, consent, data minimisation and deletion into the app from the first sprint, and collect only the data the app needs. In Poland, the UODO supervises data protection. Your legal adviser has the final word.
Who works on our project, and how do we communicate?
Projects are led by UnFoldMart from our international offices, with a small dedicated team. Calls are by video, in English, with a demo after each sprint.
Can you take over an existing app?
Yes. We start with a review of the code, the store listings and the backend, then fix, upgrade or rebuild in steps, so your app stays available.
Building an app in Warsaw?
Tell us what you want to build; the quote follows in writing.