I set myself one rule for a side project: every tool has to run entirely in the user's browser. No file ever gets uploaded to a server. If I couldn't do something client-side, it didn't ship.
Source: [Dev.to](https://dev.to/dodly-jr/i-shipped-three-ai-tools-that-run-entirely-in-the-browser-heres-everything-that-broke-1o0e)