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Fly.io vs Koyeb

Koyeb scores higher on the AgentReady, 57/100 against 53/100. 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

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.

Koyeb. Developer-friendly serverless platform designed to let businesses and developers easily deploy reliable and scalable applications globally, with high-performance infrastructure for AI inference, sandboxes, and microservices on CPUs, GPUs, and accelerators

Where Fly.io is ahead

Fly.io passes clear canonical domain and llms.txt published, and Koyeb does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds operate: agent compatibility verified. Koyeb misses it.

Where Koyeb is ahead

Koyeb passes clear product positioning, 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 adopt: no mandatory sales call, agent-compatible signup flow, free trial or free allowance, fast time to first request and copyable quickstart. Fly.io misses those.

What neither does

Both fail llms-full.txt / full agent docs, structured api reference, 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, 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. Both sit at 80/100 here. Fly.io misses clear product positioning, llms-full.txt / full agent docs; Koyeb misses clear canonical domain, llms.txt published, llms-full.txt / full agent docs.

Understand. Both sit at 23/100 here. 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; Koyeb misses structured api reference, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt is whether an agent can get a key and make its first successful call without a human in the loop. Koyeb leads 90 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; Koyeb misses programmatic credential creation.

Operate. Fly.io leads 53 to 35. Fly.io misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable; Koyeb misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

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

Signal by signal

Which to pick

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

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