Built a Cross-AI Chat History Searcher
Ok_Negotiation_2587 · reddit · 2026-07-15
Using ChatGPT, Claude, Gemini, and Grok simultaneously, the author accumulated around 2,000 conversations. The pain point was often remembering asking something, but forgetting which assistant they asked.
They built a browser extension that syncs chat histories from all four platforms into a unified local index:
- Content scripts on each site sync conversation increments;
- The extension's own service worker maintains a shared IndexedDB;
- Search results are grouped by platform and link directly back to the original conversation;
- Disabled by default, users can enable it per platform, and disabling clears the corresponding data.
The author emphasized that no data is uploaded to the cloud. For security, write permissions only check the sender origin without trusting the message body itself. The results window is also placed inside a closed shadow root to prevent page scripts from snooping on cross-platform snippets.
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