Rallio

Strava for tennis. Record your matches and practice, then see the analytics behind your game.

Role: Solo build. Product direction and engineering.
Type: Mobile app · social
Status: In development, releasing soon

The problem

In 2026 I started taking tennis seriously, and I wanted what Strava gives runners: a way to track progress over time and share the journey. But I couldn't find anything that let me log my matches and practice sessions the way I wanted, and the part I wanted most was analytics, especially from video.

So I started building Rallio: a mobile app where players record their matches and sessions, get real analytics on how they are playing, and share that progress through a social layer.

Record and share

The feed is the social layer. You log a match, it becomes a result you can share, and you can follow other players, find courts, and build a history over time.

This is the part inspired by Strava: progress that is social by default, not a private logbook.

Rallio's home feed showing suggested courts, a match result between two players, and achievements. — Home feed

Analytics from the footage

Each match has an overview, a shot map, the recording, and notes. The footage is the source of truth, so a match turns into insight instead of just a memory.

Getting there meant going deep on video: detecting events in match footage and turning raw recordings into something the app can actually reason about.

Rallio's match detail screen with tabs for overview, shot map, recording, and notes. — Match detail

What I learned

Most of the lessons came from outside the product. I got hands-on with machine learning: training and labeling data, and working frame by frame through match footage to make the analysis accurate.

Alongside that, I learned what it really takes to build a consumer social app people would want to use, not just a tracker for myself.