If you opened this page, you probably went looking for “WhatRuns API” or “WhatRuns API key,” hit a dead end, and started searching for an alternative. That’s the right move— WhatRuns has no public API , no key, and no documentation. It is a browser extension, full stop. The good news is that the use cases people associate with WhatRuns—identifying JavaScript frameworks, spotting CMS platforms, mapping hosting and CDN providers, enriching lead lists—are well covered by APIs you can hit with curl in a few seconds. This guide walks through four practical WhatRuns alternative API options, the trade-offs between them, and a working example you can copy and run today. Why WhatRuns Has No Public API WhatRuns’ founder shipped the extension as a free product several years ago and effectively walked away from active development. The extension still works as a manual lookup tool, but the team never published a REST endpoint, never released SDKs, and never documented an authentication flow.…