Diffbot alternatives
The highest-scoring alternative to Diffbot is Apollo at 64/100 on the AgentReady, against 59/100 for Diffbot.
All scored in Company & Contact Data APIs.
What Apollo does that Diffbot does not
Apollo passes clear canonical domain, agent-compatible signup flow, cli available, observable execution, agent compatibility verified, and Diffbot fails them. That is the whole of the gap between the two scores, so if none of those matter to your agent the ranking above overstates the difference.
Why people look for an alternative
Diffbot fails clear canonical domain, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart, cli available, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution, agent compatibility verified. Each one is a place an unattended run stops, which is usually what sends someone looking in the first place.
Where Diffbot loses the points
| Pillar | Diffbot | What it measures |
|---|---|---|
| Discover | 93 | Can an agent find it at all: sitemap, robots, structured data. |
| Understand | 54 | Is there a spec, an llms.txt, a machine-readable description. |
| Adopt | 55 | Signup, keys, SDKs, and whether a human has to be involved. |
| Operate | 35 | Rate-limit headers, errors, status, and behaviour under load. |
Diffbot is weakest on operate at 35/100. Missing rate-limit headers mean an agent finds the limit by hitting it. If that is the part your agent depends on, take the ranking above seriously; if it is not, Diffbot may still be the right pick.
What an agent runs into with Diffbot
These are the findings from the last audit on 2026-08-22. Each one is a place unattended software stops, which is the practical reason to look at the list above.
- Flesh out the OpenAPI: paths, schemas, and descriptions.
- Document error responses as an enum in your OpenAPI.
- Let agents create API keys programmatically.
- Return X-RateLimit / Retry-After headers so agents pace themselves.
- Return request IDs and expose status/usage so runs are observable.
- Add request examples to your API reference.
- Add response examples to your API reference.
- Add a copyable quickstart so first success is fast.
What this category actually supports
Across the 7 products scored in Company & Contact Data APIs, enrich a person is offered by 29%, find b2b contacts is offered by 29%, enrich a company is offered by 14%, research a company is offered by 14%. Anything under half is a gap you should expect to fill yourself whichever one you pick.
An agent can get this list directly: resolve("alternative to Diffbot") over the MCP server, or GET /v1/categories/data-enrichment.