Toshiharu Katami

Toshiharu Katami

Building Arrows Lite for focused work

About

I'm a solo maker based in Japan, building practical tools that make everyday digital work and media use simpler. My current projects include Channel Timeline Viewer, an iPhone and Android app for watching YouTube channels from the beginning and tracking your progress, and Arrows Lite, a Chrome extension for saving unfinished work and resuming it without losing context. My background is in IT administration and e-commerce operations, so most of what I build starts with a real problem I’ve experienced myself. I'm here to learn from other makers, share what I'm building, and improve through honest feedback.

Badges

Tastemaker
Tastemaker
Gone streaking
Gone streaking
Gone streaking 5
Gone streaking 5

Maker History

  • Channel Timeline Viewer
    Channel Timeline ViewerWatch YouTube channels from the beginning, in order
    Sep 2026
  • 🎉
    Joined Product HuntJuly 13th, 2026

Forums

Channel Timeline Viewer - Watch YouTube channels from the beginning, in order

Channel Timeline Viewer turns a YouTube channel into a watchable timeline. Sort uploads oldest-first, track watched videos and progress, resume from the exact second, and keep notes as you work through a channel. Built for archives, lecture series, tutorials, and long-running shows. Available on iPhone and Android, with 10,000+ installs.
View more