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u/FlowBuilder-yoga

Shipped a major update to my yoga app. A few technical things I built that might be interesting to this community.
▲ 1 r/appledevelopers

Shipped a major update to my yoga app. A few technical things I built that might be interesting to this community.

Landing page: https://h.flowbuilder.yoga

I've been building FlowBuilder solo for over a year. It's a yoga sequencing app with a permanently free core and a freemium model above that. Just pushed the biggest update yet and wanted to share some of the more technically interesting parts with people who might appreciate them.

A few things worth talking about from a dev perspective:

The on device flow generator runs entirely locally with no API calls and no internet requirement. It takes your level, focus areas, duration, and hold length preferences and builds a sequence through a probability weighted pose selection model. Getting it to produce genuinely varied and coherent flows without any LLM involved took a while to get right.

Pose to Flow uses the camera to score body alignment joint by joint in real time and surfaces specific coaching cues. Building on top of Apple's Vision framework for this was the most technically demanding thing I've done on this project. Getting latency low enough to feel responsive while running analysis on each frame was a real challenge.

Posture Check uses the gyroscopic sensors in AirPods to track posture data passively throughout the day. The Apple background processing restrictions mean it can only run for up to three minutes after the app closes, which required some creative UX decisions to work around cleanly.

Music Sync pairs an Apple Music playlist alongside a flow so you can build sequences that move with the music. Due to App Store restrictions this works as a display and timing layer rather than directly controlling playback, which was an interesting constraint to design around.

The analytics screen uses interactive 3D body models built with SceneKit to visualize which muscle groups a flow targets. Making those feel smooth and readable at the sizes they render on iPhone was more work than I expected.

The web app at flowbuilder.yoga runs a parallel version of the core features in the browser.

Happy to get into specifics on any of the above if anyone is curious about implementation.

App Store: https://apps.apple.com/us/app/flowbuilder-yoga/id6758913355

Web app: https://flowbuilder.yoga

u/FlowBuilder-yoga — 1 day ago
Image 1 — A year into building a yoga app solo. Here is what the journey actually looked like.
Image 2 — A year into building a yoga app solo. Here is what the journey actually looked like.
Image 3 — A year into building a yoga app solo. Here is what the journey actually looked like.
Image 4 — A year into building a yoga app solo. Here is what the journey actually looked like.
Image 5 — A year into building a yoga app solo. Here is what the journey actually looked like.
Image 6 — A year into building a yoga app solo. Here is what the journey actually looked like.
Image 7 — A year into building a yoga app solo. Here is what the journey actually looked like.
Image 8 — A year into building a yoga app solo. Here is what the journey actually looked like.
▲ 1 r/TheFounders

A year into building a yoga app solo. Here is what the journey actually looked like.

Landing page: https://h.flowbuilder.yoga

I started FlowBuilder because I was frustrated. Every yoga app I tried locked the useful stuff behind a subscription before I had any reason to trust them. So I built something that doesn't do that.

The core is free and always will be. 190 plus poses, drag and drop flow builder, voice guided playback in English or Sanskrit, breathwork, meditation, analytics. No trial period. No credit card. No expiry.

Above that I built a freemium model with four tiers, topping out at $12.99 a month for the full premium feature set including real time joint scoring through the camera, on device flow generation, posture tracking via AirPods, and a 3D interactive body heat map in analytics. Every premium feature is free to try once.

The web app at flowbuilder.yoga runs the same core features in the browser on any device, also free.

Here is what a year of building this alone actually looked like.

I shipped a version. Then I rebuilt the UI. Then I rebuilt the branding. Then I rebuilt the onboarding. Every time it felt like going backwards. Every time the product came out better. I have started over more times than I planned and I think that is just the shape of the process when you are doing it alone without anyone to pressure test decisions in real time.

The hardest part has not been the technical side. It has been figuring out who the app is actually for. Yoga practitioners who want to build their own flows. Teachers planning classes. People who want AI assisted guidance without paying a subscription to try it. The product serves all of them but I have not found the message that reaches all of them cleanly.

Downloads are growing. Monetization is still early. Android is in development. Achievements and goals are coming.

If you are building something alone I would genuinely like to hear what the hardest part has been for you and what you wish you had known earlier.

App Store: https://apps.apple.com/us/app/flowbuilder-yoga/id6758913355

Web app: https://flowbuilder.yoga

u/FlowBuilder-yoga — 1 day ago
Image 1 — I just launched a new version of my yoga app. Built it alone. Here's what it does and what I'm still figuring out.
Image 2 — I just launched a new version of my yoga app. Built it alone. Here's what it does and what I'm still figuring out.
Image 3 — I just launched a new version of my yoga app. Built it alone. Here's what it does and what I'm still figuring out.
Image 4 — I just launched a new version of my yoga app. Built it alone. Here's what it does and what I'm still figuring out.
Image 5 — I just launched a new version of my yoga app. Built it alone. Here's what it does and what I'm still figuring out.
Image 6 — I just launched a new version of my yoga app. Built it alone. Here's what it does and what I'm still figuring out.
Image 7 — I just launched a new version of my yoga app. Built it alone. Here's what it does and what I'm still figuring out.
▲ 5 r/StartupAccelerators+1 crossposts

I just launched a new version of my yoga app. Built it alone. Here's what it does and what I'm still figuring out.

Landing page: https://h.flowbuilder.yoga

I've been working on FlowBuilder for over a year as a solo developer. It's a yoga sequencing app and the latest version is the biggest thing I've shipped so far.

The product in one sentence: build custom yoga flows, practice them with voice guided playback, and track your progress over time, all free.

What makes it different from every other yoga app is that the core is genuinely free. Not a trial. Not a limited version that nudges you toward a paywall after three sessions. 190 plus poses, full flow builder, analytics, breathwork, meditation, web app. Free. Permanently.

The features I'm most proud of from this release:

Pose to Flow scores your alignment joint by joint in real time using your camera and gives specific coaching tips. It's the feature that felt hardest to build and the one I think has the most room to grow.

Generate Flow builds a sequence on device based on your level, focus area, and available time. No internet. No API calls. Runs locally.

Text to Flow lets you describe a flow in plain language and the app parses it into a sequence. It sounds like a gimmick until you use it and realize it's actually the fastest way to build.

The 3D body heat map in analytics shows which muscle groups your flows are hitting and for how long, using interactive models you can rotate and explore.

On the business side I'm running a freemium model with four tiers from free up to $12.99 a month for the full premium feature set. All premium features are free to try once. I'm still early on figuring out what actually converts and would genuinely welcome input from people who have been through that.

Android is in development. Achievements and goals are coming. A few other things I'm not ready to talk about yet.

App Store: https://apps.apple.com/us/app/flowbuilder-yoga/id6758913355 Web app: https://flowbuilder.yoga

u/FlowBuilder-yoga — 1 day ago
Image 1 — I've been building a yoga app alone for over a year. Here's where it stands.
Image 2 — I've been building a yoga app alone for over a year. Here's where it stands.
Image 3 — I've been building a yoga app alone for over a year. Here's where it stands.
Image 4 — I've been building a yoga app alone for over a year. Here's where it stands.
Image 5 — I've been building a yoga app alone for over a year. Here's where it stands.
Image 6 — I've been building a yoga app alone for over a year. Here's where it stands.
Image 7 — I've been building a yoga app alone for over a year. Here's where it stands.
Image 8 — I've been building a yoga app alone for over a year. Here's where it stands.
Image 9 — I've been building a yoga app alone for over a year. Here's where it stands.
▲ 4 r/ShowYourApp+1 crossposts

I've been building a yoga app alone for over a year. Here's where it stands.

Landing page: https://h.flowbuilder.yoga

No co-founder. No funding. No team. Just me, a lot of iteration, and an app called FlowBuilder.

I started it because I wanted a yoga sequencing app that didn't treat basic functionality as a premium feature. Every app I tried wanted a subscription before I could do anything useful. So I built my own.

The core has always been free and always will be. 190 plus poses, drag and drop flow builder, voice guided playback in English or Sanskrit, breathwork, meditation, analytics. All of it free. No credit card required.

But I kept building. The features that came after are the ones I'm most proud of:

Generate Flow creates a full sequence on device based on your level, focus areas, and available time. No internet. No third party LLM. Just runs locally.

Text to Flow lets you describe a sequence in plain language and the app parses it into a flow. You type, it builds.

Pose to Flow uses your camera to score your alignment joint by joint in real time with specific coaching tips. It's the closest thing to having a teacher in the room.

The analytics screen has a 3D interactive body heat map showing exactly which muscle groups your flows are targeting and for how long.

I also built a full web app at flowbuilder.yoga that runs the same core features in the browser, cross platform, still free.

What I've learned doing this alone is that the hardest part isn't the building. It's the restarting. I've overhauled the UI, the branding, the onboarding, the positioning, multiple times. Each time felt like going backwards and each time the product came out better.

Currently working on Android, achievements, and a few things I'm not ready to talk about yet.

If you're building something alone I'd genuinely like to hear what stage you're at and what's been the hardest part for you.

App Store: https://apps.apple.com/us/app/flowbuilder-yoga/id6758913355

Web app: https://flowbuilder.yoga

u/FlowBuilder-yoga — 1 day ago