# Ear Training Exercise

Startup, Worldwide.

> Clarena turns decades of cognitive-science research into 20 adaptive exercises for memory, reasoning, pitch, visual attention, and mental math. Practice deliberately and track your scores over time.
>
> — in its own words, from clarena.app, read 2026-07-13

- Website: https://clarena.app/app/try
- Listed since: 2026
- launched: 2026-09-17
- launch post: https://news.ycombinator.com/item?id=49737154
- hn score: 2
- domain created: 2026-06-18
- Last verified: 2026-09-17


## Sources

- Hacker News, "Show HN" — https://news.ycombinator.com/item?id=49737154, read 2026-09-17

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startup.is · https://startup.is/registry/ear-training-exercise · open data: /api/v1, /llms.txt