App development company in Madrid
Mobile app development for Madrid companies: iOS, Android and web apps in Spanish and English, for users in Spain and beyond, from first brief to store release.
- Custom quote after a brief
- No sales pitch
Company-wide:★★★★★ 4.9+ on Clutch·250+ brands·10 offices
UnFoldMart is an app development company with an office at P.º de la Castellana, 259C, Planta 19, 28046 Madrid. We design and build iOS, Android, cross-platform (Flutter, React Native) and web apps for Madrid companies, in Spanish and English, with the GDPR and Spain's LOPDGDD planned in, from discovery to store release and support. Meetings with Madrid 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 | P.º de la Castellana, 259C, Planta 19, Fuencarral-El Pardo, 28046 Madrid, Spain |
| 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 Madrid companies
Madrid is Spain's capital and largest economy, the base of many Spanish banks, telecoms and retailers, and a gateway to Spanish-speaking markets in Latin America. A Spanish-language app can reach users well beyond Spain.
Madrid at a glance
- IndustriesBanking and insurance, retail, telecoms, travel, real estate, SaaS
- Data lawGDPR and Spain's LOPDGDD, supervised by the AEPD
- PaymentsBizum, cards, Apple Pay, Google Pay
- LanguagesSpanish and English
- Time zoneCET in winter, CEST in summer
Banking and insurance
Customer and onboarding apps with security built in.
Retail and consumer brands
Shopping, loyalty and delivery apps.
Travel and hospitality
Booking and guest apps for visitors.
What our Madrid app developers build
App development (desarrollo de apps) end to end: iOS and Android apps, Flutter and React Native apps, web apps and the backend behind them.
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 an app development company in Madrid
Six checks before you sign, whoever you hire.
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.
- Regional settingsServing Spain and Latin America adds languages, currencies and testing.
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 LOPDGDD and accessibility
This is general information, not legal advice. Your legal adviser has the final word.
GDPR and the LOPDGDD
The GDPR sets the rules for personal data across the EU; Spain's Organic Law 3/2018 (LOPDGDD) adds the national rules and digital rights. We plan consent, data minimisation and deletion into the app from the first sprint.
Official source: LOPDGDD (BOE) ↗AEPD
The Spanish Data Protection Agency (AEPD) supervises how organisations in Spain handle personal data and publishes guidance for them.
Official source: aepd.es ↗Accessibility (Law 11/2023)
Spain's Law 11/2023 transposes the European Accessibility Act. From 28 June 2025 it 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: Ley 11/2023 (BOE) ↗Public standards we align our work to
Working with us from Madrid
One dedicated team; projects are led by UnFoldMart from our international offices.
Our Madrid office
P.º de la Castellana, 259C, Planta 19, Fuencarral-El Pardo, 28046 Madrid
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 Amsterdam, Frankfurt, Zürich, Paris and Warsaw 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 Madrid: before you book a call.
Do you have an office in Madrid?
Yes. UnFoldMart's Madrid office is at P.º de la Castellana, 259C, Planta 19, Fuencarral-El Pardo, 28046 Madrid. Workshops, design reviews and weekly check-ins with Madrid clients take place by video, in English.
How much does it cost to build an app in Madrid?
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 work for Spain and Latin America?
Yes. We set up languages, currencies and regional settings so one app can serve users in Spain and in Spanish-speaking markets abroad. Spanish is one of our eight working languages.
How do you handle the GDPR and the LOPDGDD?
We plan consent, data minimisation and deletion into the app from the first sprint, and collect only the data the app needs. The AEPD is the Spanish regulator; your legal adviser has the final word.
Can you connect Bizum and the other payment methods Spanish users expect?
Yes. Many Spanish users pay with Bizum, alongside cards, Apple Pay and Google Pay. We connect the methods your payment provider supports.
Do you build apps for banks and insurers in Madrid?
Yes, we build customer and internal apps for financial companies. Security testing runs before every release, and we document how the app handles data and access so your compliance team can review it.
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.
Can you add AI features to our app?
Yes, for example a chat assistant, smart search, document reading or recommendations, built in with your data under control. See our AI agent development service for more.
Building an app in Madrid?
Tell us what you want to build; the quote follows in writing.