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Deno Deploy vs Fly.io

Fly.io scores higher on the AgentReady, 53/100 against 52/100. They differ on 10 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Deno Deploy. Deno is a fast, open-source, fully Node-compatible JavaScript runtime with TypeScript and everything else you need baked right in.

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.

Where Deno Deploy is ahead

Deno Deploy 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. Fly.io misses it.

And on adopt, no mandatory sales call and agent-compatible signup flow. Fly.io misses those.

Where Fly.io is ahead

Fly.io passes clear canonical domain and mcp discoverable, and Deno Deploy 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. Deno Deploy misses it.

And on adopt, self-service signup and mcp integration available. Deno Deploy misses those.

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, free trial or free allowance, fast time to first request, copyable quickstart, 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. Deno Deploy misses clear canonical domain, mcp discoverable; Fly.io misses clear product positioning, llms-full.txt / full agent docs.

Understand. Deno Deploy leads 31 to 23. Deno Deploy misses openapi / spec quality, authentication documented, pricing understandable, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; 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.

Adopt is whether an agent can get a key and make its first successful call without a human in the loop. Fly.io leads 55 to 45. Deno Deploy misses self-service signup, programmatic credential creation, free trial or free allowance, fast time to first request, copyable quickstart, mcp integration available; 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.

Operate. Both sit at 53/100 here. Deno Deploy misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable; Fly.io misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable.

Pricing

Deno Deploy does not publish a machine-readable starting price. Fly.io starts at $29/mo.

Signal by signal

Which to pick

Signal counts are level here, so fit and price decide it. Full profiles: Deno Deploy and Fly.io. Alternatives to each: Deno Deploy, Fly.io.

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