# usedby

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

- name: ai.usedby/usedby
- version: 1.2.0
- connection class: R0 (autonomous)
- trust: 83/100 flags: no-repository
- quality: 86/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/ai.usedby%2Fusedby
- tools: https://api.protogrid.dev/v1/servers/ai.usedby%2Fusedby/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "usedby": {
      "type": "http",
      "url": "https://www.usedby.ai/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 100
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-100% +updated-12d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 86/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 100 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 5 of 5 tools declare readOnlyHint or destructiveHint
- pass `tools.directory_hints`: every tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
- pass `tools.token_cost`: about 1,072 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 75 (weight 15)

- warn `stability.changes`: 14 tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 5, about 1,072 tokens to load them all
- tool set hash: 916379698aaccdf74bfe4201f251e69c
- tools last changed: 2026-10-16T18:18:18.689Z
- badge: [![protogrid quality](https://protogrid.dev/badge/ai.usedby/usedby.svg)](https://protogrid.dev/servers/ai.usedby/usedby)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-16 `compare` changed (outputSchema)
- 2026-10-16 `recent_changes` changed (outputSchema)
- 2026-10-16 `company_stack` changed (outputSchema)
- 2026-10-16 `who_uses` changed (description, outputSchema)
  - before: Companies that publicly use a tool, strongest proof first, each with its proof level (CONFIRMED, OBSERVED, or SIGNAL: a job post, the weakest proof), source page and first public proof date.
  - after: 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.
- 2026-10-12 `compare` changed (inputSchema, outputSchema)
- 2026-10-12 `company_stack` changed (inputSchema, outputSchema)
- 2026-10-12 `who_uses` changed (inputSchema, outputSchema)
- 2026-10-11 `compare` changed (description, outputSchema)
  - before: Two tools side by side: public customers with their proof mix, top industries, companies confirmed or observed on both, and vendor facts with their sources.
  - after: 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.
- 2026-10-09 `search_tools` changed (description, outputSchema)
  - before: Find AI and software tools tracked on usedby by name or category, with how many companies publicly use each.
  - after: 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.
- 2026-10-08 `compare` changed (outputSchema)

Full history: https://api.protogrid.dev/v1/servers/ai.usedby%2Fusedby/changes

## Remotes

- https://www.usedby.ai/mcp (streamable-http, auth none, reachable true, uptime30d 1)

## Packages

_none_

## Tools (5)

- `company_stack`: Tools a company publicly uses according to usedby, strongest proof first, each with its proof level (job-post signals last) and source page.
- `compare`: 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.
- `recent_changes`: Companies newly listed as customers by tool vendors in the last N days, optionally for one tool. Departures are not published.
- `search_tools`: 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.
- `who_uses`: 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.