# Gym app built through constant testing

A gym app whose founder treats product development like a science experiment, using A/B tests and feature validation to decide what to build.

| Tag | Value | Confidence |
|---|---|---|
| Category | Software and apps | 97% |
| Earns from | Subscriptions | 91% |
| Startup cost (estimate) | $1k to $10k | 47% (low) |
| Time (estimate) | Part-time | 50% (low) |
| Where | Online | 97% |
| Coding | Needs coding | 98% |

Owner-reported (not verified): $160,000 last month

Source: [How I Built This $160K/Month Gym App](https://www.youtube.com/watch?v=OV09yPLf8BI), Starter Story, Mauro, with Pat Walls, 2026-09-09
Page: https://allsidehustleideas.com/ideas/gym-app-built-through-constant-testing-c6008e

## About this data

- Sources are public, first-person accounts: interviews, podcasts and community threads.
- Cost, time and the other tags are machine estimates, each with a confidence score.
- Income figures are the owner's own claim. We don't verify them.
- Link the idea page and its source. Call income figures the owner's unverified claim, and cost and time estimates.