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Fly.io vs Replicate

Replicate scores higher on the AgentReady, 82/100 against 53/100. They differ on 14 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Fly.io. Fly.io provides real hardware-isolated Linux computers (called Sprites and Machines) for agents, evals, and tools, with a pay-as-you-go model where billing goes to zero when not in use.

Replicate. Platform to run and fine-tune AI models, deploy custom models, and generate images, speech, music, and video via API

Where Fly.io is ahead

Fly.io passes agent compatibility verified, and Replicate does not. That is operate, whether an agent can run against it in production and recover when a call fails.

Where Replicate is ahead

Replicate passes clear product positioning and llms-full.txt / full agent docs, and Fly.io 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, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented and limits / constraints documented. Fly.io misses those.

And on adopt, programmatic credential creation and free trial or free allowance. Fly.io misses those.

Finally, on operate, structured, predictable output and machine-readable errors. Fly.io misses those.

What neither does

Both fail no mandatory sales call, agent-compatible signup flow, fast time to first request, copyable quickstart, 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. Replicate leads 100 to 80. Fly.io misses clear product positioning, llms-full.txt / full agent docs; Replicate misses nothing.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Replicate leads 100 to 23. Fly.io misses structured api reference, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Replicate misses nothing.

Adopt. Replicate leads 70 to 55. Fly.io misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, free trial or free allowance, fast time to first request, copyable quickstart; Replicate misses no mandatory sales call, agent-compatible signup flow, fast time to first request, copyable quickstart.

Operate. Replicate leads 59 to 53. Fly.io misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable; Replicate misses retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Fly.io starts at $29/mo. Replicate does not publish one and has a free tier.

Signal by signal

Which to pick

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

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