Find websites similar to any domain.
Enter a domain and we'll surface sites with overlapping referring-domain footprints — useful for competitor research, link prospecting, and partnership scouting.
Need this for 1,000 domains?
The same data is available via the REST API — pay only for what you use, credits never expire.
# Same data, programmatically — first 100 credits free on signup
curl "https://api.rankparse.com/v1/similar-domains?domain=example.com" \
-H "X-API-Key: rp_your_key"About this tool
Two websites are "similar" in SEO terms when they share a meaningful slice of the same backlink sources. If 200 different domains link to both Stripe and Square, that overlap tells you they operate in the same competitive space — far more reliably than tag-based or category-based heuristics.
RankParse builds this graph from Common Crawl's 3 billion-page index. We pull the top referring domains for the input site, then count how often those same sources also link out to other sites. The result is a ranked list of competitors weighted by shared link sources, not by editorial guesswork.
How it works
Submit a domain and we sample its top 50 referring domains, then walk their outbound links to find the most common co-cited targets. The output is a ranked list of up to 25 similar sites with an "overlap" score — the number of referring domains that link to both.
Anonymous users get 5 free checks per day. Sign up free for 25/day. Need bulk? The same data is on the REST API as /v1/similar-domains — first 100 credits free on signup.
Frequently asked questions
- How is this different from SimilarWeb?
- SimilarWeb infers similarity from clickstream/audience data they buy from ISPs and panels. We infer it from the public link graph. Both signals are useful — link-based similarity is stronger for SEO use cases (competitor research, link prospecting); audience similarity is stronger for paid-marketing use cases.
- Why are some big sites missing?
- We need the input domain to have at least a handful of referring domains in the latest crawl. Sites blocked by robots.txt, behind login walls, or very new may have sparse data and return fewer (or no) similar sites.
- How fresh is the data?
- The current dataset is built from Common Crawl January–March 2026. New crawls ship every quarter.
- Can I get more than 25 results?
- The free tool caps at 25 to keep it readable. The /v1/similar-domains API endpoint supports up to 100 results per request — sign up for an API key (first 100 credits free).