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One workspace to run the same prompt across GPT, Claude, and Gemini side by side, with mindmaps and notes.
Mnemosphere is a research workspace that sends a single prompt to multiple frontier chat models at once so you can compare their answers side by side, rather than switching between separate apps or tabs. It adds research-oriented extras on top of raw model comparison: instant mindmaps built from a conversation, one-click critique of a model's answer, a highlighter and notes layer over chat transcripts, and a mode for extracting information from YouTube videos. There is no free tier visible on the pricing page; access starts with the Pro plan, backed by a 14-day money-back guarantee rather than a trial.
$25/month Pro plan is the entry tier (up to 200 messages/month across models); a higher Ultra tier adds deep research and more messages. Both plans carry a 14-day money-back guarantee instead of a free trial.
Use tool ↗Mnemosphere is built for people who already compare model outputs by hand and want that workflow in one place, with mindmaps and note-taking layered on top of raw chat. There is no free way to try it beyond the refund window, which is a real barrier compared with aggregators that offer a free tier.
Watch out: The 200 messages/month cap on the entry plan can run out fast if you're querying several models per prompt.
Side-by-side fact sheets against the competitors our research names — pricing, platforms, API and both verdicts on one page.
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