# getactuators

> Open, spec-level directory of robot actuators (QDD motors, integrated joints, smart servos, harmonic and cycloidal reducers) and the robots that use them.

The catalog holds 68 actuators from 30 brands in 6 categories, plus 6 robots with the motor in each joint. It is free, public and read-only: no account, API key or payment is needed for the site, the REST API or the MCP server. Data last updated 2026-09-26.

## When to use getactuators

Reach for getactuators when a user needs numbers about robot joint actuators:

- Pick an actuator for a quadruped leg, humanoid joint or robot arm given a torque, weight or budget target (filter by use_case, min_peak_torque_nm, max_weight_g, max_price_usd).
- Rank actuators by torque density, price per Nm, backlash or speed.
- Compare two or more specific actuators side by side (peak and rated torque, gear ratio, weight, voltage, bus, encoder, price).
- Find which motors a real robot uses in each joint, or which robots use a given actuator.
- Look up one actuator's datasheet-level specs with source links before recommending it.

How to call it:

- MCP: connect a Streamable HTTP client to https://getactuators.com/mcp (no auth). Tools: search_actuators, get_actuator, compare_actuators, recommend_actuators, list_actuator_categories, list_brands, list_robots, get_robot, find_robots_using_actuator.
- REST: GET https://getactuators.com/api/v1/actuators?use_case=quadruped_leg&sort=torque_density_nm_per_kg returns JSON, no key needed.
- Markdown: append .md to any page URL, or send Accept: text/markdown.

## Connect

- MCP server: `https://getactuators.com/mcp` (Streamable HTTP, server name getactuators, anonymous and read-only)
- Docs MCP server: `https://getactuators.com/mcp/docs` (the site documentation over MCP, same terms)
- [MCP server card](https://getactuators.com/.well-known/mcp/server-card.json): tools and endpoint before you connect
- [OpenAPI description](https://getactuators.com/openapi.json): machine-readable REST contract
- [API reference](https://getactuators.com/docs/api): endpoints, parameters and examples
- [API index](https://getactuators.com/api): JSON list of every endpoint
- [auth.md](https://getactuators.com/auth.md): why no credentials are needed

## Docs for agents

- [llms-full.txt](https://getactuators.com/llms-full.txt): the whole catalog as text in one fetch
- [agents.md](https://getactuators.com/agents.md): agent guide: when to use, MCP, REST, limits
- [pricing.md](https://getactuators.com/pricing.md): free plan, rate limit and license
- [Actuators section](https://getactuators.com/actuators/llms.txt): one line per actuator with its markdown spec sheet
- [Robots section](https://getactuators.com/robots/llms.txt): robots and the motors in each joint
- [API docs section](https://getactuators.com/docs/llms.txt): REST endpoints and discovery documents
- [Agent skill](https://getactuators.com/.well-known/agent-skills/getactuators/SKILL.md): SKILL.md teaching an agent to use the API and MCP server

## Catalog pages (markdown)

- [Home](https://getactuators.com/index.md): overview, top actuators by torque density, FAQ
- [All actuators](https://getactuators.com/all.md): every actuator in one table
- [Gallery](https://getactuators.com/actuators.md): actuators grouped by category
- [Robots](https://getactuators.com/robots.md): robots with per-joint motors

## About

- [About](https://getactuators.com/about.md): who runs the catalog and how data is verified
- [Contact](https://getactuators.com/contact.md): report wrong data or contribute via GitHub
- [Privacy](https://getactuators.com/privacy.md): no accounts, cookies or analytics

## Optional

- [Sitemap](https://getactuators.com/sitemap.xml): every indexable URL
- [JSON Lines feed](https://getactuators.com/feeds/actuators.jsonl): one actuator object per line
- [Source repository](https://github.com/Miyamura80/getactuators): dataset, site code and AGENTS.md, MIT License