Fitness app concept that needs workout tracking, video demos, and progress charts but unsure whether to build iOS-first, Android-first, or cross-platform -- and what the trade-offs actually cost?
Fitness app built on a white-label platform that can't support the specific workout format or progression logic your methodology requires?
Fitness App Development
Custom fitness mobile apps for iOS and Android -- workout tracking, exercise libraries, video demonstrations, wearable integration, and in-app billing built around your training methodology.
We build apps that members open daily, not apps that get deleted after the first week.
Workout tracking with exercise library and custom program builder
Wearable integration with Apple Health, Google Fit, and Garmin
Video exercise demonstrations with offline playback
In-app subscription billing for iOS and Android
RaftLabs builds custom fitness mobile apps for iOS and Android -- workout tracking, exercise libraries, training plan delivery, progress logging, wearable integration with Apple Health and Google Fit, coach-to-client messaging, and in-app subscription billing. We build native and cross-platform fitness apps for consumer brands, coaching businesses, and fitness startups. Most fitness app projects deliver in 12-16 weeks at a fixed cost.
100+Software products shipped
·FixedCost delivery
·12-16Week delivery cycles
·24+Industries served
Fitness apps that get used, not deleted
Most fitness apps fail at retention, not features. Members download the app, complete the onboarding, and stop opening it after week two because the experience doesn't match how they actually train. The workout format doesn't fit their schedule. The video library covers exercises they don't do. The progress tracking shows numbers but not what to do with them.
We build fitness apps around the specific training methodology, member type, and business model of each client. The workout logic, progression rules, and content structure reflect how your coaches actually program -- not a generic template. The result is an app that fits the training experience you've already built, delivered as a product your members can access anywhere.
What we build
Workout and training plan delivery
Structured workout delivery with exercise-by-exercise guidance, sets and reps or duration tracking, rest timers, and completion logging. Custom program builder for coaches to create, assign, and update training plans. Support for strength, cardio, HIIT, mobility, and circuit formats. Progression logic that adjusts weights, volume, or intensity based on performance data. The training engine built around your programming methodology, not a generic one-size-fits-all structure.
Exercise library and video demonstrations
Searchable exercise library with video demonstrations, written cues, and coach notes. Content management interface for coaches to add, edit, and organise exercises. Video delivery optimised for mobile -- adaptive bitrate streaming and offline download for members who train without reliable connectivity. Multi-angle demonstration support for technique-heavy movements. Exercises tagged by muscle group, equipment, difficulty, and training modality for filtering and program building.
Progress tracking and body metrics logging
Performance logging for strength (weight lifted, reps completed, personal records), cardio (pace, distance, heart rate), and body metrics (weight, measurements, progress photos). Trend charts that show progress over weeks and months. Check-in forms and assessment tools for coaches to track client progress outside of workout data. Milestone and personal record notifications that give members a reason to keep logging. The data layer that makes training progress visible and keeps members engaged.
Wearable and health data integration
Integration with Apple Health and Google Fit for automatic activity, heart rate, and sleep data import. Garmin Connect, Whoop, and Fitbit API integration for clients using those devices. Wearable data displayed alongside training plan data so members and coaches see objective activity in context. Heart rate zone tracking during workouts for cardio and HIIT programming. The integrations that make your app the single place members see all their fitness data -- not just the workouts done inside your platform.
Coach-to-client messaging and feedback
In-app messaging between coaches and clients with workout-specific feedback threads. Video message support for form feedback on uploaded workout videos. Check-in response workflows for weekly progress reports. Push notification management for workout reminders, coach messages, and program updates. For coaching businesses with multiple coaches, a coach assignment system with client roster management. The communication layer that makes remote coaching feel like in-person support.
In-app subscription and purchase management
In-app subscription billing for iOS (App Store) and Android (Google Play) with monthly, annual, and tiered plan support. Free trial and introductory pricing flows. One-time program and content purchases alongside subscriptions. Stripe integration for web payment as a complement to in-app billing. Subscription management for members -- upgrade, downgrade, pause, and cancel from inside the app. Revenue reporting and subscription metric dashboards for the business. The billing infrastructure built for the way fitness businesses actually monetise.
Frequently asked questions
For most fitness apps, React Native or Flutter is the right choice. You get iOS and Android from one codebase, which cuts development cost and ongoing maintenance effort significantly. The performance gap between cross-platform and native is small for fitness app use cases -- workout tracking, video playback, and wearable data sync all work well in both. Native development makes sense when you need deep hardware access, very high-performance UI animations, or you're targeting a single platform first and want to optimise for it. We'll recommend the right approach based on your feature requirements and release timeline.
Apple Health integration uses HealthKit on iOS to read and write workout, activity, heart rate, and body metrics data. Google Fit integration uses the Fitness REST API and the Android Health Connect API for similar data types. Garmin integration uses the Garmin Health API, which requires a Garmin developer partnership agreement. We handle the implementation and help you navigate the API agreements during the project. The depth of integration -- what data types you read and write -- is a design decision we make based on your app's core functionality.
We build video delivery on cloud infrastructure -- typically AWS S3 and CloudFront or equivalent -- with adaptive bitrate streaming so video quality adjusts to the member's connection speed. For offline playback, we implement encrypted local download so members can use the app without connectivity. A content management interface lets coaches upload and manage video without developer involvement. Video storage and delivery cost scales with your library size and member volume -- we model the expected cost during scoping so there are no surprises.
A focused fitness app MVP -- workout tracking, a basic exercise library, progress logging, and in-app subscription billing -- typically runs $20,000-$50,000 and delivers in 12-14 weeks. A full-featured fitness app with wearable integration, video library, coach-to-client messaging, and custom program builder typically runs $40,000-$100,000. Cost is driven by the depth of the training engine, video infrastructure requirements, and the number of integrations. We scope before pricing so you know the full cost before development starts.
