The situation
Anyone tracking a weight loss journey with smart scales and a fitness tracker already knows the problem. Your weight data lives in one app. Your workout data lives in another. Neither talks to the other. If you want to see patterns between your activity and your progress, you're copying numbers into a spreadsheet by hand.
The commercial alternatives don't help much either. AI coaching apps like Noom or Future cost £30 to £150 a month, and they still don't pull your data together into one place. If you're on GLP-1 medication like Wegovy or Ozempic, nothing on the market tracks both your weight journey and your injection schedule in a single view.
The client wanted one platform that brought everything together. Weight and body composition from Withings smart scales. Activity data from Strava. AI coaching that actually understands your progress. Predictions based on real trends. And a motivational layer that keeps you coming back every day. All without paying hundreds a month for the privilege.
What we built
A complete health and fitness dashboard that pulls data from Withings and Strava automatically every hour, analyses it with AI, and presents everything in one place.
The platform connects to both services through a single login. Once linked, it syncs body composition data and workout history in the background without the user lifting a finger. No manual imports. No spreadsheets. No switching between apps.
The AI coaching system uses Amazon Bedrock to generate daily insights, spot patterns in your data, predict where you'll be in 30, 60, or 90 days based on current trends, and suggest adjustments to your goals when the numbers warrant it. A smart caching system keeps running costs minimal compared to the A smart caching system means the AI runs at under £2 a month instead of the £30 to £150 that commercial coaching apps charge.pound;30 to A smart caching system means the AI runs at under £2 a month instead of the £30 to £150 that commercial coaching apps charge.pound;150 that commercial coaching apps charge.
The dashboard includes 23 visualisation components designed around motivation, not just data display. A mountain climb graphic shows your weight loss as an ascent. A momentum meter tracks whether you're accelerating, holding steady, or stalling. A calendar view shows your consistency over time, like the contribution graphs developers use on GitHub. When you hit a milestone, the screen celebrates with confetti and unlocks an achievement badge.
The gamification layer tracks over 50 achievements across weight loss milestones, consistency streaks, and activity targets. All of it persists in the cloud, so it survives clearing your browser or switching devices.
Progress photos are compressed on your phone before upload, keeping storage costs low and upload times fast. You can export everything to PDF, CSV, or JSON at any point. Your data belongs to you.
The entire platform is installable as an app on your phone. It works offline. And because it runs on serverless infrastructure, there's no server ticking over burning money when nobody's using it.
The numbers
| Traditional build | Tyree Digital | |
|---|---|---|
| Cost | £79,585 | £9,500 |
| Timeline | 9 to 14 months | 52 days |
| Speed | 1x | 8 to 12x faster |
| Saving | £70,085 (88%) |
The equivalent commercial stack (separate apps for tracking, coaching, and analytics) would cost £101 to £220 per month in subscriptions. This platform replaces all of them. The build cost pays for itself within 4 to 8 years on subscription savings alone, and the platform continues delivering value indefinitely after that.
If this were packaged as a SaaS product targeting the GLP-1 medication market (projected at 40 million users globally by 2030), a subscription of £4.99 per month with serverless infrastructure would produce gross margins approaching 99%.
What the client owns
A production-deployed platform with 52,970 lines of code, running 24/7 on AWS. Withings syncs body composition data automatically. Strava syncs activities hourly. AI coaching generates fresh insights throughout the day. Email notifications arrive via SES. Progress photos store securely in S3. The entire infrastructure is defined as code, version-controlled, and reproducible from scratch.
325 automated tests. 27 documentation files. A full CI/CD pipeline that deploys on every push to the main branch. A 613-line security audit with every identified issue resolved before launch.
No vendor lock-in. No monthly licensing. No third party controlling the roadmap. Full ownership.
What happens next
A monthly subscription covers hosting, maintenance, and ongoing development. The serverless architecture means infrastructure costs stay minimal regardless of how the platform evolves. New features, additional integrations, and improvements to the AI coaching are all buildable on the existing foundation without any infrastructure changes.