The bugs. The decisions. The program-generation logic. The pre-launch status updates. What a triathlon training app actually looks like when an engineer builds it in public.
I'm a software engineer who got into triathlon a few years ago. I tried every training app on the market. Each one was broken in a different way. This is the story of why I started building.
Four sessions a week drive 80% of your Ironman result. Most training apps treat every session as equal. Here's the exact ranking function Rift uses, and why it changes everything when your week explodes.
I almost shipped Rift with brick workouts in week 1 of every Ironman plan. Then I read four years of Coach Rob Wilby's transcripts and changed my mind. Here's the rule, the reason, and the code that enforces it.
I used TrainingPeaks for eighteen months before I started building Rift. This isn't a takedown. It's a list of the specific things TrainingPeaks does well, the specific things it doesn't, and how I made Rift different.
TestFlight opens September 2026. $17.99/mo or $129/yr when paid subscriptions open.
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