Build That Extension

Database of 9,500+ expired Chrome extensions with 500+ users for idea hunting.

Web appone_timeglobal

A web app that provides a searchable database of 9,500+ expired Chrome extensions that each previously had 500+ users. It helps developers, indie hackers, and founders find validated extension ideas and rebuild abandoned tools to target existing demand.

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Full match profile

Behind the summary, Matchbox keeps a richer profile of Build That Extension - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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