All tools
Building the product · 3 of 110 stories
PHP
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 |
|---|---|---|---|---|---|
| Photo AI | Language of the whole product: one index.php file with inline HTML, CSS and JavaScript. one file, no framework | C | Pieter Levels, 3 July 2023: Photo AI is almost 14,000 lines of raw PHP making $61,808 per month | ||
| Interior AI | Language of the site's server code; the 2026 dispute system for Interior AI is written in it. | C | Pieter Levels, 6 April 2026: Made an auto-dispute response system for Interior AI | ||
| Sheets Resume | The programming language of the web application. | C | Starter Story, 21 March 2025: We Built A $20K/Month AI Resume App |
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.