Who follows both? X audience overlap checker

The parts of two audiences PlayerSells has indexed, not the audiences themselves. Our follow graph is built by reading the following lists of accounts we crawl plus a capped sample of each crawled account's followers, so no account's follower list in it is complete. Both indexed set sizes are printed next to every number for exactly that reason.

Because dividing a sampled intersection by a full follower count is wrong by orders of magnitude while looking entirely reasonable. The rate on this page is the shared count as a share of the SMALLER indexed set, which answers the question people are really asking: how much of the narrower audience already sits inside the wider one.

No. There is no signup, no email gate, no daily limit and no export cap. The comparison runs on a plain GET request, so the result URL can be shared and it loads for whoever opens it.

A single comparison reads at most 25,000 indexed followers per account. When either side hits that ceiling the page says so, because a truncated intersection is a smaller number that looks exactly like a real one. The true overlap for a capped pair is larger than the figure shown.

We crawl a large slice of X but not all of it: 22,837,969 accounts as of 5 October 2026. A handle we have never reached is usually new, protected or spelled differently, and reporting zero shared followers for it would be a confident wrong answer rather than a missing one.

The total number following both is exact within the indexed sets. The list underneath shows the 24 largest of them, ordered by follower count, so the names that carry the most weight appear first.

Each pair is cached for a day. The follow graph is rebuilt far more slowly than that, so a fresher read would return the same answer at a much higher cost.