Mnemosphere
Mnemosphere is an AI chat workspace that gives you frontier models from several labs in one place. Ask once and compare up to three models side by side, run parallel prompts, turn answers into mind maps and chat with files, web pages and YouTube videos.
Pros
- Up to three models answer the same prompt side by side
- models can respond to each other's answers
- parallel prompts
- one-click mind maps and critique
- highlighter and notes
- web search across models
- uploads of PDF, CSV, Excel, images and code
Cons
- No free plan
- Pro is capped at 200 messages a month
- no image or video generation
- up to 5 attachments per question
Cost
Pro: $25/month, up to 200 messages a month. Ultra adds multi-model deep research and up to 1,000 messages a month. Yearly billing gives 2 months free; 14-day money-back guarantee.
Verdict
Best for researchers, analysts and product managers who want to compare answers from several frontier models without paying for each subscription.
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