"How much does a fitness app cost?" is the first question every wellness startup asks. The honest answer: it depends entirely on what you're building. But we can give you real numbers based on the health tech apps we've built.
Quick Cost Summary
| App Type | Timeline | Cost Range (UK) |
|---|---|---|
| MVP / Proof of Concept | 2-3 months | £25,000 - £45,000 |
| Standard Fitness App | 4-5 months | £50,000 - £80,000 |
| Full-Featured Platform | 6-9 months | £90,000 - £150,000 |
| Enterprise Health Tech | 9-12+ months | £150,000+ |
These ranges assume a UK-based development team. Offshore rates are lower but come with coordination overhead that often erodes the savings.
What Drives the Cost?
1. Platform Choice
Cross-platform (React Native / Flutter): One codebase for iOS and Android. Typically 40-50% cheaper than building both natively.
Native (Swift + Kotlin): Better for apps with heavy device integration, complex animations, or Apple Watch companions. Budget 70-80% more than cross-platform.
Web-first (Progressive Web App): Cheapest option but limited access to health APIs and background features. Only suitable for simple tracking apps.
For most wellness apps, we recommend React Native with Expo. You get native performance, access to HealthKit and Health Connect, and ship to both platforms from one codebase.
2. Core Features
Every fitness app needs these basics:
| Feature | Complexity | Cost Impact |
|---|---|---|
| User authentication | Low | £2,000 - £4,000 |
| Workout logging | Medium | £8,000 - £15,000 |
| Progress tracking & charts | Medium | £6,000 - £12,000 |
| HealthKit / Health Connect sync | Medium-High | £8,000 - £15,000 |
| Push notifications | Low | £2,000 - £4,000 |
| Basic analytics dashboard | Medium | £5,000 - £10,000 |
3. Advanced Features
These are where costs climb:
| Feature | Complexity | Cost Impact |
|---|---|---|
| Apple Watch companion app | High | £20,000 - £35,000 |
| Real-time workout tracking (GPS) | High | £15,000 - £25,000 |
| Social features (friends, challenges) | High | £20,000 - £40,000 |
| AI workout recommendations | High | £15,000 - £30,000 |
| Video streaming (workout classes) | Very High | £30,000 - £50,000 |
| Bluetooth wearable integration | High | £15,000 - £25,000 |
| Subscription payments (Stripe) | Medium | £8,000 - £15,000 |
| Offline-first architecture | High | £10,000 - £20,000 |
4. Backend Complexity
A simple fitness app might use Firebase or Supabase - low cost, fast to build. A platform with social features, real-time sync, and complex business logic needs a custom backend.
| Backend Type | Use Case | Cost Impact |
|---|---|---|
| BaaS (Firebase, Supabase) | Simple apps, MVPs | £5,000 - £10,000 |
| Custom API (Node.js, Python) | Most production apps | £15,000 - £30,000 |
| Microservices architecture | High-scale platforms | £40,000+ |
5. Design
Good UX is critical for fitness apps. Users interact with your app mid-workout - every tap matters.
| Design Level | What You Get | Cost |
|---|---|---|
| Template-based | Customised UI kit | £3,000 - £6,000 |
| Custom design | Bespoke UI, basic UX | £8,000 - £15,000 |
| Full UX process | Research, testing, iteration | £15,000 - £25,000 |
Real-World Examples
Example 1: Personal Trainer App (MVP)
A personal trainer wanted an app for their clients to log workouts and track progress.
Features: Authentication, workout logging, progress photos, basic charts, push notifications
Tech stack: React Native, Expo, Supabase, RevenueCat
Timeline: 10 weeks
Cost: £38,000
Example 2: Gym Chain Member App
A gym chain needed a member-facing app with class bookings, workout tracking, and integration with their existing member management system.
Features: Class schedule & booking, workout logging, HealthKit sync, membership management, push notifications, custom API integration
Tech stack: React Native, Node.js backend, PostgreSQL, Stripe
Timeline: 18 weeks
Cost: £85,000
Example 3: Wellness Platform with Coaching
A wellness startup building a platform connecting users with coaches, including video calls, meal planning, and workout programmes.
Features: User + coach apps, video calling, workout builder, meal planning, progress tracking, subscription payments, admin dashboard
Tech stack: React Native, Next.js web admin, Node.js microservices, PostgreSQL, Redis, Daily.co for video
Timeline: 32 weeks
Cost: £145,000
The Tech Stack We Recommend
For most wellness apps in 2026:
Mobile: React Native with Expo (EAS for builds)
State management: Zustand (simple) or TanStack Query (server state)
Health integration: react-native-health (iOS), react-native-health-connect (Android)
Backend: Node.js with Hono or Fastify, PostgreSQL, hosted on Railway or Render
Authentication: Clerk or Supabase Auth
Payments: Stripe + RevenueCat for subscriptions
Analytics: PostHog (privacy-friendly, self-hostable)
This stack balances development speed, maintainability, and cost. It's what we use for most fitness app projects.
Timeline Breakdown
A typical 4-month fitness app project:
| Phase | Duration | What Happens |
|---|---|---|
| Discovery & Design | 3-4 weeks | Requirements, wireframes, UI design |
| Core Development | 8-10 weeks | Authentication, main features, backend |
| Health Integration | 2-3 weeks | HealthKit, Health Connect, testing |
| Polish & Testing | 2-3 weeks | Bug fixes, performance, App Store prep |
| Launch | 1 week | App Store submission, monitoring |
The health integration phase often takes longer than expected. Both Apple and Google have strict requirements, and testing requires real devices.
Hidden Costs to Budget For
App Store fees: £79/year (Apple) + £20 one-time (Google)
Backend hosting: £50-500/month depending on scale
Third-party services: Push notifications, analytics, crash reporting - typically £100-300/month
Ongoing maintenance: Budget 15-20% of initial build cost per year for updates, OS compatibility, and bug fixes
App Store review delays: Apple reviews can take 1-7 days. Budget time for rejections and resubmissions.
How to Reduce Costs
1. Start with one platform: Launch on iOS first (higher-value users in wellness), add Android after validation.
2. Use a BaaS for MVP: Firebase or Supabase for your first version. Migrate to custom backend when you hit scale.
3. Skip the Watch app initially: Apple Watch apps are expensive. Most users are fine with HealthKit sync for the first version.
4. Limit social features: Social adds significant complexity. Start with individual tracking, add community features based on user feedback.
5. Manual before automated: AI recommendations can be rules-based initially. Don't build ML infrastructure until you have the data to train on.
Red Flags When Hiring
Watch out for agencies that:
- Quote fixed prices without understanding your requirements
- Promise delivery in "4-6 weeks" for a full-featured app
- Don't ask about your business model and target users
- Can't show you fitness or health apps they've built
- Don't mention HealthKit/Health Connect complexity
Building health tech isn't like building a standard consumer app. The health data APIs, background execution requirements, and privacy considerations require specific experience.
Next Steps
If you're planning a wellness app:
- Define your MVP - What's the one thing your app does better than alternatives?
- Know your users - Casual fitness enthusiasts have different needs than serious athletes
- Plan for compliance - If you're handling health data, understand GDPR and potentially medical device regulations
- Budget for iteration - Your first version won't be perfect. Reserve budget for post-launch improvements.
We help wellness and fitness startups scope, design, and build their apps. If you want a realistic assessment of what your app will cost, get in touch for a free consultation.
For a broader product budget, see our MVP development cost guide. Explore our fitness app development services for help planning a build.
