# Captchainbox

Startup, Worldwide.

> make senders work to get into your inbox
>
> — in its own words, from captchainbox.com

- Website: https://www.captchainbox.com
- Listed since: 2026
- launched: 2026-07-06
- launch post: https://news.ycombinator.com/item?id=48804775
- hn score: 6
- domain created: 2026-02-25
- Last verified: 2026-07-06


## Sources

- Hacker News, "Show HN" — https://news.ycombinator.com/item?id=48804775, read 2026-07-06

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startup.is · https://startup.is/registry/captchainbox · open data: /api/v1, /llms.txt