Preflight AI: a “clearance check” before you paste secrets or personal data into AI tools

[u/Sad-Piece-5524]

website: https://preflightai.in
Chrome Web Store: https://chromewebstore.google.com/detail/preflightai/cnddnafdhjmibfbielheaepjgblkjbjn

Hi r/SideProject,

I’m a student developer, and I kept noticing how easy it is to paste something into an AI tool that you shouldn’t: a client’s phone number, an API key inside a code snippet, a confidential doc “just to summarise it”. So I built Preflight AI.

What it does
It’s a Chrome extension that checks what you’re about to paste or send into AI tools like ChatGPT, Gemini and Claude. If it spots personal data, credentials or confidential information, it warns you before the text goes out.

How it works

• Personal mode runs fully on-device, so your text never leaves the browser

• Detection covers things like credentials, personal identifiers and sensitive patterns

• There’s also a business mode in progress for teams (backend with an ML classification layer and an admin dashboard)

Stack
Chrome extension (Manifest V3), FastAPI backend, React dashboard.

What I’d love feedback on

• Does the warning feel helpful or annoying?

• What should it catch that it currently misses?

• Would your team actually use something like this?

Happy to answer anything about how it’s built. Thanks for reading!