Jinwoo Cheon

Jinwoo Cheon

Build products that stays in my head

Badges

Tastemaker
Tastemaker
Gone streaking
Gone streaking

Maker History

  • Rankr
    RankrSee your app's chart rank in 175 countries, on both stores
    Oct 2026
  • Coin Cat
    Coin CatTurboTax for Korean crypto investors
    Feb 2026
  • 🎉
    Joined Product HuntDecember 13th, 2022

Forums

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19d ago

Rankr - See your app's chart rank in 175 countries, on both stores

Add your app and Rankr finds every chart it's in, across 175 countries on the App Store and Google Play: Top Free and Top Paid in every category, plus Top Grossing on Google Play. See your rank in every country side by side, a rank heatmap and history, and get an alert when your app hits a new best rank or enters a new country. Share cards for your wins. No account needed. Free tracks 2 apps; Pro tracks 25 apps in every country, to #200.
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9mo ago

Coin Cat - TurboTax for Korean crypto investors

Korea enforces 22% crypto tax in 2027. Most investors aren't ready. Coincat syncs your trades from Korea's top exchanges (Upbit, Bithumb, and more), calculates tax liability, and finds savings you'd miss. ✓ One-click exchange sync (read-only API) ✓ Real-time portfolio tracking ✓ Capital gains calculation (FIFO) ✓ Tax-loss harvesting alerts ✓ Export reports for filing Free to start. Built by ex-Naver, Toss, Banksalad engineers.
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