Diffbot API review
Best entity extraction
Diffbot reads a page the way a person would and returns structured fields without you writing a parser. Point it at an article and get title, author, date and body; point it at a product and get price and specification. That generalisation across sites is the product.
Behind it sits a Knowledge Graph of more than 246 million organisations, which is where the SEO relevance gets interesting: entity data, organisation relationships and the kind of structured facts that matter as search shifts toward entities and AI answers.
Who Diffbot API is for
Teams doing entity-based SEO, large-scale content analysis or competitive intelligence across many sites. It is a poor fit for anyone whose need is ranking or keyword data, which it does not provide at all.
Strengths and limits
What it does well
- Extraction that generalises across sites, so a new source needs no new parser.
- A Knowledge Graph of 246 million-plus organisations, useful for entity and schema work.
- Specialised article, product and discussion APIs with sensible field sets.
- A genuine free tier at 10,000 credits with no card required.
Where it falls short
- Expensive past the free tier, starting at $299 a month.
- No SEO metrics whatsoever: no rankings, volumes or backlinks.
- Extraction accuracy varies on unusual page structures, so spot-check before trusting it at scale.
Diffbot API pricing
Free at 10,000 credits with no card required, then Startup at $299 a month for 250,000 credits and Plus at $899 for 1,000,000, with custom enterprise pricing above.
The free tier is large enough for real evaluation and for small ongoing jobs. The jump to $299 is steep, so be clear about which specific question the Knowledge Graph is answering before committing.
Verdict
A specialist worth knowing about as SEO moves toward entities. The extraction is genuinely good and the Knowledge Graph has no real equivalent here. Start on the free tier and be honest about whether it answers a question you actually have, because it is expensive to keep around otherwise.
Diffbot API FAQ
How much does Diffbot cost?
Free at 10,000 credits with no card required, then $299 a month for 250,000 credits on Startup and $899 for 1,000,000 on Plus, with custom enterprise pricing above.What is the Diffbot Knowledge Graph?
A structured database of over 246 million organisations plus people and products, built from continuous web crawling. For SEO it is useful for entity research and understanding how an organisation is represented across the web.Can Diffbot replace a scraping API?
For structured extraction, often yes, because it identifies fields automatically instead of needing selectors. For raw high-volume fetching it is far more expensive than Zyte or ScraperAPI.Does Diffbot provide SEO metrics?
No. There are no rankings, search volumes or backlinks. It is a content and entity extraction platform that complements an SEO API rather than replacing one.
Other providers worth a look
This is an independent review. We have no affiliate relationship with Diffbot API, earn nothing if you sign up, and no provider pays for placement in the directory. Prices were read from the vendor's own pages in August 2026 and change without notice.