Takahiro Tannai

Mathematician (Ph.D.) & iOS Developer

About

Ph.D. mathematician turned indie developer. Building Apple-native tools for deep thinkers and small businesses. Creator of Scout — a Zettelkasten notes app for iOS/macOS.

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Tastemaker

Gone streaking

Maker History

Scout: Zettelkasten NotesThe minimalist thinking OS with zero viscosity.
Apr 2026

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Joined Product HuntApril 29th, 2026

Forums

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2mo ago

Scout: Zettelkasten Notes - The minimalist thinking OS with zero viscosity.

Fast, local, and utterly distraction-free. Scout is a beautifully dark, Zettelkasten-inspired note app built for deep thinkers. Your ideas stay strictly on your device—a pure, zero-friction canvas to turn daily chaos into absolute clarity.