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holehe

Which sites is this email address registered on?

Overview

holehe checks an email address against dozens of platforms' "forgot password" or account-creation endpoints to infer whether an account exists — without ever logging in, since most sites leak this via subtly different response behavior for registered vs. unregistered addresses.

Field Note

Sites change their signup/reset flows often enough that modules break silently — a "not found" result can just as easily mean the module is stale as it can mean no account exists, so cross-check anything you plan to rely on. It is genuinely useful as a fast triage step before a manual per-platform check.
Best for
Quickly narrowing which platforms to check manually once you have a target email.
Pricing
Free & open source (GPL-3.0)
Last updated
August 17, 2026