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Modal vs Restate

Restate scores higher on the AgentReady, 59/100 against 55/100. They differ on 9 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Modal. Modal provides a serverless cloud for engineers and researchers who want to build compute-intensive applications without thinking about infrastructure.

Restate. Restate is a lightweight runtime to turn AI agents, workflows, and backend services into durable processes.

Where Modal is ahead

Modal passes structured api reference, and Restate 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 and agent-compatible signup flow. Restate misses those.

Where Restate is ahead

Restate passes clear canonical domain and mcp discoverable, and Modal does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds adopt: fast time to first request, copyable quickstart and mcp integration available. Modal misses those.

And on operate, retry behavior documented. Modal misses it.

What neither does

Both fail openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, programmatic credential creation, structured, predictable output, machine-readable errors, idempotency support, rate-limit behavior predictable, agent compatibility verified. 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. Restate leads 100 to 80. Modal misses clear canonical domain, mcp discoverable; Restate misses nothing.

Understand. Modal leads 38 to 23. Modal misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Restate misses structured api reference, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Restate leads 70 to 65. Modal misses programmatic credential creation, fast time to first request, copyable quickstart, mcp integration available; Restate misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation.

Operate. Restate leads 41 to 35. Modal misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified; Restate misses structured, predictable output, machine-readable errors, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Modal starts at $0/mo and has a free tier. Restate starts at $0/mo and has a free tier.

Signal by signal

Which to pick

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

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