Who follows both? X audience overlap checker
Put two X accounts in and this page shows which accounts follow both of them, drawn from our own follow graph of 79 million edges. Useful for sizing up a competitor, checking whether two creators share a crowd before paying either of them, or finding the people who already sit in both worlds. Every other tool that does this asks you to sign up first. This one does not, and there is no export limit because there is nothing to export around.
Worked examples
What this measures, exactly
This is the overlap between the parts of two audiences we have indexed, not between the audiences themselves. Our graph is built by reading the following lists of accounts we crawl and a capped sample of each crawled account's followers, so nobody's follower list in it is complete. An account with four million followers might be represented by a few thousand of them here. Because of how those edges are collected, the accounts you see skew toward ones substantial enough to have been crawled themselves, which makes the answer closer to "which notable accounts follow both" than to a raw headcount. That is usually the more useful question, but it is a different one, so the page states both indexed set sizes next to every number rather than reporting a sampled overlap as if it were a total.
Handles we have never crawled are reported as missing rather than fetched on demand. Comparisons are cached for a day, so a link you share loads instantly for whoever opens it.