All tools
Building the product · 3 of 110 stories
Expo
Who uses it, and for what
One row per story. The grade is for the claim that the business uses this tool, not for its revenue.
| Story | What it does there | When | Cost stated | Grade | Source |
|---|---|---|---|---|---|
| Umax | Framework used with React Native to build the app, in the stack the founder described in December 2024. | C | Starter Story, 29 December 2024: He made $10M with 3 iPhone apps (video interview with transcript) | ||
| SoundBoost.ai | Toolkit for the phone app; the founder wrote the app with it in about four months. | C | Berkan Cesur on X, 15 August 2025: the iPhone app and its tech stack | ||
| Polsia | Builds and distributes the mobile apps that agents make for customer companies. EAS builds | C | Polsia Terms of Service and app code, read 12 October 2026 |
Grade A: the tool's maker or a payment processor confirms the use. Grade B: an independent report, or the tool is visible in public code. Grade C: the founder or the company says so.
Used in the same businesses
Other tools in the stories above, with the number of stories that share both.
Other tools for the same job
Building the product, with the number of stories that use each.