Repstack

Most gym apps do one thing: log your workouts. You enter the weight, the reps, the sets — and that's it. No feedback, no direction, no intelligence. Just a digital notebook that does nothing with the data you hand it every single day.

RepStack is different.

RepStack is an AI-powered workout tracker built for people who actually want to make progress — not just keep records. From the moment you start training, RepStack learns how you move, how you recover, and how your strength evolves over time. It doesn't just store your data. It uses it.

The app's progressive overload engine analyzes your performance after every session and tells you exactly what to do next — when to add weight, when to push harder, and when to pull back. No guesswork. No wasted sessions. Just a clear, intelligent path forward every time you walk through the gym door.

Your Strength Score gives you a single, evolving metric that reflects your overall lifting ability across every movement pattern. Watch it climb as you get stronger, use it to spot weaknesses, and finally have an honest measure of where you stand — not just how many days you showed up.

RepStack also visualizes your muscle engagement across every workout, so you can see at a glance which muscle groups you're hitting, which ones you're neglecting, and how balanced your training really is. It's the kind of clarity that used to require a personal trainer. Now it lives in your pocket.

Whether you're coming from Strong, Hevy, or a notes app with a chaotic list of PRs, RepStack imports your history and picks up exactly where you left off. Apple Watch support, Live Activity, and Dynamic Island integration keep your workout flowing without ever pulling out your phone mid-set.

And because your data should work for you — not disappear when you switch apps — RepStack is built around privacy-first principles with no mandatory account required. Just download, start training, and let the AI do the thinking.

RepStack is for the lifter who's tired of showing up without a plan. For the person who knows consistency isn't enough if the training itself isn't intelligent. For anyone who's ever finished a session and thought — what should I actually be doing next?

Now you'll always have an answer.