Dev clones $3B Calendly with Codex for ~$15k in tokens, open-sources the repo
GrowthHackingEU · x · 2026-08-29
Nate Herk used OpenAI's Codex to clone Calendly, an app valued around $3 billion (rival Cal.com is valued near $150M). The project consumed roughly $15k in tokens, but the result is now "free forever" — and he open-sourced the repo, linking it in the replies along with a write-up titled "I Cloned a $3 Billion App With Codex".
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