keikei

I build tools that save creators time.

About

Solo developer based in Japan. I build and ship tools to solve problems I actually run into — so they're practical, focused, and built for real use. All my tools are one-time purchase. No subscriptions, ever.

Links

OwnKit

Badges

Tastemaker

Gone streaking

Gone streaking 5

Maker History

Proposal EngineAI proposals that get replies — built on data, not guesses
Jul 2026
CourseKitGenerate a complete course kit in 5 minutes — buy once
Jul 2026
ContextTubeStop switching YouTube accounts. Switch modes instead.
May 2026

🎉

Joined Product HuntMay 22nd, 2026

Forums

•

1d ago

CourseKit - Generate a complete course kit in 5 minutes — buy once

CourseKit generates everything you need to build and sell an online course — in one click. Enter your topic and audience. Get: • Complete course outline • Per-lesson outlines (objective, key points, exercise) • Quiz questions (5 MCQ per section) • Sales page copy (headline, benefits, FAQ, CTA) • Platform descriptions (Udemy/Teachable-ready) All 5 outputs save to your desktop. Uses your own Anthropic API key (~$0.20 per course). No subscription — $39 once.

•

1d ago

Proposal Engine - AI proposals that get replies — built on data, not guesses

Most AI proposal tools give everyone the same generic output. This one is built on what actually drives reply rates. Hits the 150–250 word Upwork sweet spot, auto-extracts screening questions (70% of rejections miss these), writes in your real voice, and tells you which work sample to attach (+35% reply rate). Runs on your own Claude API key (~$0.01/proposal). One-time purchase. No installation needed.

•

1mo ago

ContextTube - Stop switching YouTube accounts. Switch modes instead.

Switch YouTube to match what you're doing. Separate work, hobbies, and everything else with one click.