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SavvyCal vs Windmill

Windmill scores higher on the AgentReady, 64/100 against 39/100. They differ on 13 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

SavvyCal. A scheduling platform that provides a fresh way to find a time to meet, with flexible controls to keep calendars sane and an ultra-convenient booking experience for recipients.

Windmill. Windmill is a fast, open-source workflow engine and developer platform.

Where SavvyCal is ahead

SavvyCal passes authentication documented, and Windmill does not. That is understand, whether an agent can read the docs and work out how the API behaves before calling it.

It also holds adopt: no mandatory sales call. Windmill misses it.

Where Windmill is ahead

Windmill passes search discoverable, clear canonical domain, clear product positioning, llms.txt published and llms-full.txt / full agent docs, and SavvyCal does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: structured api reference and limits / constraints documented. SavvyCal misses those.

And on adopt, official typescript sdk, official python sdk and cli available. SavvyCal misses those.

Finally, on operate, agent compatibility verified. SavvyCal misses it.

What neither does

Both fail mcp discoverable, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, programmatic credential creation, mcp integration available, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable. If your agent needs any of those, you will be building it yourself either way.

Score, pillar by pillar

The AgentReady splits into four pillars, scored separately, because a product can be easy to find and still impossible to adopt.

Discover is whether an agent can find the product at all without being told it exists. Windmill leads 87 to 40. SavvyCal misses search discoverable, clear canonical domain, clear product positioning, llms.txt published, llms-full.txt / full agent docs, mcp discoverable; Windmill misses mcp discoverable.

Understand. Windmill leads 46 to 31. SavvyCal misses structured api reference, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Windmill misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented.

Adopt. Windmill leads 67 to 50. SavvyCal misses programmatic credential creation, official typescript sdk, official python sdk, cli available, mcp integration available; Windmill misses no mandatory sales call, programmatic credential creation, mcp integration available.

Operate. Windmill leads 56 to 35. SavvyCal misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Windmill misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable.

Pricing

SavvyCal starts at $10/user/mo and has a free tier. Windmill does not publish one and has a free tier.

Signal by signal

Which to pick

Windmill clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: SavvyCal and Windmill. Alternatives to each: SavvyCal, Windmill.

An agent can fetch this as data: POST /v1/compare {"slugs": ["savvycal", "windmill"]}