Mnemosphere
Verified Oct 15, 2026 ActiveOne workspace to run the same prompt across GPT, Claude, and Gemini side by side, with mindmaps and notes.
Listed on EffectHub ·
Pricing
- Pricing model
- Paid
- Paid options from
- $25/mo
- Billing
- Monthly
Paid plans only: Pro at $25/month covers every listed model with up to 200 messages a month, and Ultra raises that to 1,000 messages with multi-model deep research. Yearly billing gives two months free; both plans carry a 14-day money-back guarantee instead of a free trial.
Use tool ↗About Mnemosphere
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.
- Platforms
- Web
- API
- Not confirmed
- Last verified
- Oct 15, 2026
Verified sources
- Pricing section: Pro per month with up to 200 messages, Ultra with up to 1,000 messages, 14-day money-back guarantee on both, yearly billing with 2 months free; FAQ says paid plans only, starting at $25/mo (15 October 2026)mnemosphere.ai ↗
- Home page: 'Plans start from $25/mo'; multi-model comparison, parallel prompts, mindmaps, critique, highlighter and notes, YouTube chat (15 October 2026)mnemosphere.ai ↗
- Terms: the service is run by Mnemosphere Pte Ltd, Robertson Road, Singapore (15 October 2026)mnemosphere.ai ↗
Is Mnemosphere legit?
We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.
- Domain registered
- Apr 9, 2024 (2 years ago)Registry record (RDAP), registrar GoDaddy.com, LLC, looked up Sep 14, 2026
- TLS certificate
- Issued by Google Trust Services, valid until Dec 27, 2026Seen in our own connection to the site on Oct 15, 2026
- Last checked
- Oct 15, 2026The site answered
- Operated by
- Mnemosphere Pte Ltd, SingaporeOur research, card verified Oct 15, 2026
Pros & cons of Mnemosphere
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.
Pros
- Runs one prompt across multiple frontier models in parallel
- Generates mindmaps directly from conversations
- Includes a highlighter/notes layer and YouTube-video intelligence features
Cons
- No free tier, only a paid plan with a refund window
- Message caps apply even on the entry Pro plan
- No API or platform details beyond the web app
Best for
- Researchers comparing how different models answer the same prompt
- Users who want mindmap summaries of long chat threads
- Structured critique of AI-generated answers
Not for
- Users wanting to try before paying anything upfront
- Casual single-model chat users who don't need comparison
Watch out: The 200 messages/month cap on the entry plan can run out fast if you're querying several models per prompt.
Alternatives to Mnemosphere
Mnemosphere head-to-head
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