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Guess who wrote what in your group chats, without uploading a thing
Drop in the export of a group conversation (WhatsApp, Messenger or Instagram), and the game picks a message and asks who wrote it: three lives, the longest streak you can manage, and a "context" view to reread the surrounding chat. Everything stays in the browser, and you can check it: the page declares a Content-Security-Policy that forbids any outgoing connection, and a build audit blocks deployment if a network primitive shows up. The draw picks the author first and then one of their messages, so that always naming the chattiest person is not a winning strategy.
What shines
- Privacy enforced by the browser itself: CSP connect-src 'none', plus an automated bundle audit in CI (fetch, XHR, WebSocket, sendBeacon forbidden)
- Robust parsers: iOS/Android WhatsApp variants, FR/EN/US dates, 12-hour format, and the latin-1 mojibake in Meta exports repaired
- Archives streamed in a Web Worker without decompressing the media: 50 MB of photos takes only about 1 MB of memory
- Balanced draw (an author picked uniformly, then one of their messages) and distractors that are always plausible
- Duplicate identities merged and phone numbers masked everywhere, so you can play while sharing your screen
How to use it
Drop in a conversation export (or click "Try with demo data"), merge the duplicates, then guess who wrote each message
Made with
- Svelte 5
- TypeScript
- Vite
- Tailwind CSS 4
- fflate (lecture ZIP en flux)
- Web Worker
- Vitest
- Testing Library
- GitHub Actions
- Content-Security-Policy