MythOS is a web-based knowledge platform that works as a shared memory between a person and the AI tools they use. Users write notes, journals, articles and lists, and each note becomes what the company calls a Living Document that an AI can read, cite and update from MythOS, ChatGPT or Claude.
The product is built around a library of Markdown memos linked by @mentions and #hashtags. Founder Brian Swichkow says he began the library in 2017. The site organizes the product into Memory, Mind and Mouth, and states it is not related to Anthropic's Claude MythOS.
How does MythOS work?
A user writes a memo in the editor, and books or topics become @mentions and #tags that link notes together. Later, from ChatGPT or Claude, the user can ask the AI to add to the same note over MCP. The result is one current copy rather than stale duplicates across tools.
Beyond MCP, MythOS offers an agent API authenticated with a personal key sent in an x-mythos-key header, limited to 60 requests per minute per key. Users can also ask their library a question and receive an answer in their own words, with a citation to the memo.
Key features of MythOS
On the capture side, MythOS provides a Markdown editor with collapsible headings and pasted images, a daily journal, voice transcription and custom memo URLs. Scholar and Oracle add email ingestion, so a forwarded email lands as a memo. Content is stored as Markdown so it stays portable.
On the AI and publishing side, the MCP server lets agents search, create and update memos, and a single context memo can replace duplicated CLAUDE.md files. Public memos can be published with one toggle, sent as newsletters, opened for community discussion and exposed to search through JSON-LD and /llms.txt.
Key Features
Markdown editor with mentions and hashtags — A rich-text editor that saves Markdown, with @mentions, #hashtags, collapsible headings and pasted images. Memos link to each other automatically.
Daily journal and voice transcription — Every tier includes unlimited memos, a daily journal and voice transcription, with media uploads of 5MB per file on Scribe.
MCP server for AI clients — Claude, ChatGPT and Cursor connect over MCP to search, create and update memos. Access is read-only on Scribe, read and write on Scholar, and adds tools on Oracle.
Reusable context memos — A context block can live as one memo indexed by hashtag and invoked on demand, instead of duplicating CLAUDE.md files across projects.
Chat with your library — Ask questions and get answers in your own words, with a citation to the memo where you wrote it. Search works by meaning, not only keywords.
Agent API and automation access — A JSON API lists, creates and updates memos, using a personal key sent in an x-mythos-key header, limited to 60 requests per minute per key.
One-toggle publishing — Any memo can be made public, unlisted or shared with specific contacts. Public memos show a chat panel that answers from the author's own memos.
Newsletter and community spaces — Public memos can become discussion spaces with upvotes, comments and forks, or be sent as newsletter issues to subscribers.
JSON-LD and /llms.txt discovery — Public content is exposed to Google and AI indexers through JSON-LD and an /llms.txt file that indexes the API, MCP server and public content.
Email-to-memo ingestion — On Scholar and Oracle, forwarding an email to the library's ingestion address creates a memo.
Markdown export — All memos and media can be exported as Markdown at any time, including after cancellation.
Pros & Cons
Pros
Works with Claude, ChatGPT, Cursor and other MCP clients, so one library serves several AI tools.
Markdown export on every plan, including after cancellation, which limits lock-in.
Private by default, and the company says it does not train on user libraries or sell context.
Publishing, newsletter and /llms.txt discovery sit in the same product as the notes.
Entry price of $9/month, with 50% off Scribe and Scholar for students, teachers and nonprofits.
Cons
No free tier according to the pricing page, only a 14-day trial of Scribe and Scholar, while the homepage says free to start.
Scribe's MCP access is read-only, so write access from AI tools needs the $49/month Scholar plan.
Oracle is annual-only and invoiced, with pricing that scales and is not fully published.
Automation tools connect through generic HTTP steps, since there are no dedicated Zapier, n8n or Make plugins.
Pricing
Scribe $9 per month (yearly billing saves 20%)
Scholar $49 per month (yearly billing saves 20%)
Oracle $99 per month (annual-only, invoiced)
Frequently Asked Questions
What is MythOS?
MythOS is a knowledge platform where notes are stored as linked Markdown memos that AI tools can read, cite and update. It connects to Claude, ChatGPT and Cursor over MCP and offers an agent API. It also lets users publish memos, send newsletters and host communities.
How much does MythOS cost?
Scribe costs $9/month, Scholar costs $49/month and Oracle costs $99/month, with a 20% saving on yearly billing. Oracle is annual-only and invoiced. Verified students, teachers and registered nonprofits get 50% off Scribe and Scholar.
Does MythOS have a free plan or free trial?
The pricing page states there is no free tier but offers a 14-day free trial on Scribe and Scholar with no card required. The homepage uses the phrase free to start, so check the current sign-up flow before relying on either.
What AI tools does MythOS work with?
The site names Claude, ChatGPT, Cursor, Windsurf, Gemini, Grok and Perplexity, and says any tool that speaks HTTP or MCP can connect. Bring-your-own API keys for OpenAI and Anthropic are supported on every tier. Scholar and Oracle include hosted AI.
Can I export my notes from MythOS?
Yes. All memos and media can be exported as Markdown at any time. After cancelling, the library stays with read-only access, and public memos become unlisted.
Is my MythOS library private?
Every memo starts private. Users can make memos public, unlisted or shared with specific contacts through permission tags. The company says it does not train on user libraries and does not sell context.
Does MythOS integrate with Zapier and n8n?
Yes, through the HTTP or webhook step in those tools, using the JSON API and a personal API key. There is no dedicated plugin. Requests are limited to 60 per minute per key.
Is MythOS related to Anthropic's Claude MythOS?
No. The company says it has used the MythOS name since 2017 and is not related to Anthropic or Claude.