Strava turned an idea for tracking runs and rides into a platform used by over 100 million people worldwide. Apps like Peloton and Calm followed a similar path — a simple idea, built well, that grew into something people rely on every day. Your fitness app idea could follow the same trajectory. The question isn’t whether the market exists — it clearly does — it’s whether you can get your version built properly, at a fair price, without losing control of it.
That’s where By Design UK comes in. We’re not a freelancer who might disappear halfway through your build, and we’re not a traditional agency with a six-figure quote and a three-month wait just to see a wireframe. We sit between the two: a UK-based team that builds working fitness platforms — activity tracking, route mapping, leaderboards, social feeds, subscription tiers — at a fixed price, using AI-accelerated development to move faster than either alternative, and you own every line of code when it’s done.
Behind the clean interface, a platform like this involves several moving parts working together:
None of that requires you to understand code. It requires a technical partner who can translate your idea into a working product without disappearing into jargon or delay.
Fitness and activity-tracking platforms typically fall within our SaaS development pricing range of £18,000–£650,000+, depending on complexity — a focused MVP with core tracking and social features sits at the lower end, while a full-scale platform with wearable integrations, advanced analytics, and multi-tier subscriptions sits higher. If your idea is closer to a simpler storefront or booking-style tool rather than a full activity platform, our Shopify builds from £499–£18,999 may be a better fit. Either way, you get a fixed price agreed upfront — no open-ended hourly billing, no surprise invoices.
Once your app is live, ongoing reliability matters. Our support plans start from £797/month for SaaS platforms and £299/month for Shopify builds, covering monitoring, updates, and fixes so your app keeps running smoothly as your user base grows.
Freelancers are often cheaper upfront, but a single person handling a fitness platform means single points of failure — if they get busy, get ill, or move on, your project stalls, and you’re rarely left with clean, well-documented code you actually own. Traditional agencies solve the reliability problem but introduce new ones: slow timelines, opaque pricing that creeps upward, and layers of account managers between you and the people actually building your app. By Design UK was built to close that gap — a proper team, fixed pricing agreed before work starts, and direct access to the people writing the code.
We don’t just claim this works — we run on it ourselves. Tackly.co.uk is a live, multi-toolkit platform we built and continue to operate, handling real users and real infrastructure daily. It’s proof that our AI-accelerated development process produces platforms that hold up in production, not just in a demo.
If you’ve got an idea for a fitness or activity-tracking app and want to know what it would actually take to build it, get in touch for a straightforward conversation — no jargon, no pressure. You can also read more about how we work on our about page.
No. Most of our clients have an idea and no coding background at all. We handle the technical decisions and explain everything in plain English throughout the process.
Yes. Full source code ownership is part of every build. There’s no ongoing licence fee to us and no lock-in — the platform is yours outright.
Timelines depend on scope, but our AI-accelerated development process means a focused MVP can typically be built significantly faster than with a traditional agency. We agree a timeline upfront alongside the fixed price.
Yes — Tackly.co.uk is a live multi-toolkit platform we built and run ourselves, demonstrating the same development approach and infrastructure capability we’d apply to your fitness app.
Image via Pixabay
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