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usedby

by usedby.ai · remote · no sign-in to list tools · v1.2.0 · published by ai.usedby

Which companies publicly use which AI and software tools, each line with its public source.

Changes · 3
CompareRegistry entry

5 tools: 3 change things and 2 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http usedby https://www.usedby.ai/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

5 tools

Changes things 3Claude Code: ask
  • company_stackTools a company publicly uses according to usedby, strongest proof first, each with its proof level (job-post signals last) and source page.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Tools a company publicly uses according to usedby, strongest proof first, each with its proof level (job-post signals last) and source page.

    Annotations the server declares

    • title: Company stack
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • recent_changesCompanies newly listed as customers by tool vendors in the last N days, optionally for one tool.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Companies newly listed as customers by tool vendors in the last N days, optionally for one tool. Departures are not published.

    Annotations the server declares

    • title: Recent changes
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • who_usesCompanies that publicly use a tool, strongest proof first, each with its proof level (CONFIRMED, DECLARED: the company states it, OBSERVED, or SIGNAL: a job post, the weakest proof…No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Companies that publicly use a tool, strongest proof first, each with its proof level (CONFIRMED, DECLARED: the company states it, OBSERVED, or SIGNAL: a job post, the weakest proof), source page and first public proof date.

    Annotations the server declares

    • title: Who uses a tool
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
Only reads 2Claude Code: allow
  • compareTwo tools side by side: public customers with their proof mix, top industries, the companies on both (every proof level, each side's level given), and vendor facts with their sourc…No findings

    Why it is in this group

    • The name "compare" says "compare": a word for reading.
    Description, as the server wrote it
    Two tools side by side: public customers with their proof mix, top industries, the companies on both (every proof level, each side's level given), and vendor facts with their sources.

    Annotations the server declares

    • title: Compare two tools
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
  • search_toolsFind AI and software tools tracked on usedby by name, other product name, or what they do (category or topic, e.g.No findings

    Why it is in this group

    • The name "search_tools" says "search": a word for reading.
    Description, as the server wrote it
    Find AI and software tools tracked on usedby by name, other product name, or what they do (category or topic, e.g. 'CRM', 'translation'), with how many companies publicly use each.

    Annotations the server declares

    • title: Search tools
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.2.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http usedby https://www.usedby.ai/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__usedby__search_tools",
      "mcp__usedby__compare"
    ],
    "ask": [
      "mcp__usedby__who_uses",
      "mcp__usedby__company_stack",
      "mcp__usedby__recent_changes"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as usedby. Review it before you use it.