Holehe Online is an OSINT tool that lets you find out which websites an email address is registered with. No installation required, free, and privacy-friendly.

Holehe.online lets you check whether a specific email address is being used to create an account on over 120 major websites and platforms (such as Twitter, Instagram, LinkedIn, Netflix, etc.).

Unlike other tools that attempt to hack or force access, Holehe uses a passive and legitimate method: it queries the password recovery or login features of the target sites to see if the email is registered there.