Adaptive plans
Resets weekly based on your progress.
Consumer mobileMobile
AI fitness coach (iOS / Android)
A cross-platform AI coach app that builds personalized programs, adapts to weekly progress, and delivers real-time form feedback from your phone camera.
- Client
- Pulse
- Timeline
- 10 weeks
- Team
- 3 engineers + designer
- Year
- 2025
92%Week-1 retention
4.8★App Store rating
180+Workouts library
3.2kBeta users
What we walked into.
Existing fitness apps felt like static PDFs. Pulse needed an experience that felt like a coach who actually paid attention.
- Personalization without a giant content team
- On-device form feedback at 60fps
- Cross-platform from week one
Our approach, in four moves.
Tight feedback loops, weekly demos, code you fully own.
01→
Coach voice
Worked with a real S&C coach to define the system prompt, weekly check-ins, and tone.
02→
Adaptive plans
Programs regenerate every Sunday from the prior week's effort and adherence data.
03→
On-device feedback
ML Kit pose estimation runs locally so users get real-time form cues without a cloud round-trip.
04
Beta to launch
8-week TestFlight + Play Store internal track with weekly cohort reviews before the public launch.
Gallery
A look at the build.
What we built
Every surface, considered.
Real-time form
On-device pose estimation, no lag.
Voice coach
Cues that feel coached, not scripted.
Habit streaks
Light gamification that does not get annoying.
Wearable sync
Apple Health and Google Fit on day one.
Offline mode
Full workouts without a signal.
Tech stack
What's under the hood.
App
React NativeTypeScriptReanimated
Backend
FirebaseCloud FunctionsFirestore
AI
ML KitOpenAICustom prompts
Quality
DetoxSentryTestFlight
Outcomes
The numbers we are proud of.
Beta cohort, n = 3,200.
Across 1,400+ reviews at launch.
Right in the sweet spot for habit.
Vs. the static PDF baseline.
“Our beta users said it felt like the app was actually paying attention to them. That is the whole product, and the team nailed it.”
LG
Lena GarciaFounder · Pulse
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