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reef

Stores shared markdown pages for households and groups, readable by Claude, ChatGPT and Codex over MCP.

Actively maintained

KnowledgeFree tierFor consumers
reefwith.me ↗
Open reefwith.meAlternativesSet it up for my teamIs reef yours? Claim the card →
At a glanceswept Oct 26, 2026

not read yet

Use

For
Households and small groups who want a shared memory their AI assistants can read, such as family or trip planning
Activity
Actively maintainedrelease 7 weeks ago
Company
Haai BVprivacy policy
Runs as
CLI
Used for
  • Keep a shared household list of allergies and trusted tradespeople
  • Record household decisions so every AI chat already knows them
Worth knowingcomputed from what we read · each with its source
Your datawhat they publish, each line with its page · read Oct 26, 2026

“When you do that, the pages your assistant reads are sent to whoever runs it, and their privacy terms apply to that exchange — not reef 's. reef does not choose your assistant and does not send your pages anywhere on its own. reef does not train any model on your content.”

privacy policy ↗

These are reef's own statements, read from its pages. We did not audit them. A line that is missing was not found on the pages we read; it does not mean the practice is absent.

How a program reaches itfound, not claimed · read Oct 26, 2026
  • MCP serverme.reefwith/reefverified in the MCP registry
  • Stateanswers, requires sign-inchecked 2026-10-26
  • Address to connectreefwith.me/mcp

MCP server details →

This card as JSON, for your agent →

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.

Alternatives in Knowledgeby use, among tools still maintained

Figure and bar: visits/mo, estimate · year: online since

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Three tools from the Atlas for the job you describe, each with what fits and what does not.

From people who use itnot part of the reading

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Questions this page answers
  • What is reef?

    Stores shared markdown pages for households and groups, readable by Claude, ChatGPT and Codex over MCP. It is listed in the Atlas under Knowledge and made by Haai BV.

  • Who is reef for?

    Households and small groups who want a shared memory their AI assistants can read, such as family or trip planning

  • Do people use reef?

    Little sign of use.

  • Is reef still maintained?

    Actively maintained: release 7 weeks ago.

  • Who owns reef?

    reef is run by Haai BV, per its privacy policy (2026-10-26).

  • Does reef train AI on your data?

    No, per its privacy policy (2026-10-26): “When you do that, the pages your assistant reads are sent to whoever runs it, and their privacy terms apply to that exchange — not reef 's. reef does not choose your assistant and does not send your pages anywhere on its own. reef does not train any model on your content.”

  • Is reef safe?

    We do not audit vendors. What reef publishes, read 2026-10-26: on training with your data, “When you do that, the pages your assistant reads are sent to whoever runs it, and their privacy terms apply to that exchange — not reef 's. reef does not choose your assistant and does not send your pages anywhere on its own. reef does not train any model on your content.”.

  • What are alternatives to reef?

    In Knowledge, by use: Plurality Network, Agentage Memory, Kepos, SkyOS, Kognite, Context Engine.

How we read a tool

No votes, no reviews, no vendor claims. Every week a crawler reads each tool's own site and a few public registries, and the words on the card are bands over what it read.

  • Use: visits to the site (estimated), installs from npm and PyPI, presence in Chrome's usage report.
  • Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
  • Price: the vendor's own pricing page, read with the date. A figure is printed only when it is on that page.
  • The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.

How AI assistants read each site — the reading vendors ask us about — is on each tool's own visibility page.

How we read every tool → · By INITE Atlas Desk