Tomohiko Saitoh's profile on Product Hunt

About

Solo developer in Japan, shipping small iPhone games alone. Most recently Reversi NEXT, where the board expands past 8x8 mid-match and new corners appear, so a losing position can turn. I spend most of my time hand-tuning the 20 AI rivals until they feel fair.

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Badges

Tastemaker

Gone streaking 10

Gone streaking

Gone streaking 5

Maker History

Bear HornTurn your phone into a loud bear-deterrent horn for hikes
Aug 2026
RetailCalc ProA Japan tax calculator that shipped the new 1% rate in days
Aug 2026
Still BoxAn offline vault for your private photos and videos
Aug 2026
SpeedShotAn iPhone camera that turns into an AI speed gun
Aug 2026
PickFace: Face Album MakerA group photo that sorts itself into a face album
Aug 2026

Forums

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17d ago

Bear Horn - Turn your phone into a loud bear-deterrent horn for hikes

Bear Horn turns your iPhone into a loud bear-deterrent horn for hikes and campsites — no separate gadget to buy or charge, just your phone at full volume. 10 sound types: hiking bells, a barking dog, a wolf howl, human conversation, a campfire, and more. Random intervals avoid a robotic loop. Fully offline. No account, no data collected. One-time purchase, no subscription. Also on Android as "Mountain Bell."

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25d ago

RetailCalc Pro - A Japan tax calculator that shipped the new 1% rate in days

Type a price, apply a discount, flip tax-inclusive/exclusive - RetailCalc Pro calculates Japan's consumption tax instantly, floor-rounded like real cash registers. Japan is weighing a cut to the reduced tax rate on groceries, from 8% to 1%, for two years from April 2027 - I shipped a dedicated 1% option within days of the news. Also included: calculation history, customizable rates, dark mode. Free for 10 calcs/day, one-time unlock for unlimited use. No ads, no subscription.

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27d ago

Still Box - An offline vault for your private photos and videos

Still Box locks away the photos and videos you don't want anyone else to find, behind a passcode and Face ID, encrypted with AES-256-GCM. There's no cloud, no server, and no account - every file stays on your device, and only you hold the key. On import it also strips GPS, device, and timestamp metadata, so nothing carries a hidden trail. Organize everything into named albums, and the app locks itself the instant you switch away - no delay, no exceptions. Free to use. iOS and Android.