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Fly.io vs Northflank

Fly.io scores higher on the AgentReady, 53/100 against 46/100. They differ on 11 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.

Northflank. The runtime platform for AI-native companies.

Where Fly.io is ahead

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

It also holds understand: pricing understandable. Northflank misses it.

And on adopt, official typescript sdk and mcp integration available. Northflank misses those.

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

Where Northflank is ahead

Northflank 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: agent-compatible signup flow, fast time to first request and copyable quickstart. Fly.io misses those.

And on operate, structured, predictable output. Fly.io misses it.

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, no mandatory sales call, programmatic credential creation, free trial or free allowance, 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. Fly.io leads 80 to 73. Fly.io misses clear product positioning, llms-full.txt / full agent docs; Northflank misses llms.txt published, llms-full.txt / full agent docs, mcp discoverable.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Fly.io leads 23 to 15. 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; Northflank misses structured api reference, openapi / spec quality, authentication documented, pricing understandable, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Fly.io leads 55 to 50. 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; Northflank misses no mandatory sales call, programmatic credential creation, free trial or free allowance, official typescript sdk, mcp integration available.

Operate. Fly.io leads 53 to 47. Fly.io misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable; Northflank misses machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

Fly.io starts at $29/mo. Northflank does not publish one.

Signal by signal

Which to pick

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

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