Tsumu
HABIT TRACKER · iOS / Android
Keep habits, quietly.
A simple habit tracker for exercise, reading, quitting smoking — anything. Streaks, grace days and a calendar make sticking with it effortless.
Completely freeVisit site
k-stone-works
@k_stone_works
Building apps, solo.
RELEASED APPS
Omakase Message
AI MESSAGE ASSISTANT · iOS / Android
Stop overthinking your messages.
AI replies, proofreading and summaries in one tap. Launches straight from the share menu — no copy-paste. Business or casual, just pick a tone.
Free / from ¥1,200/moVisit site
ABOUT
I'm a solo developer building apps on my own — from concept and design through to development. I make small, careful products that quietly take the friction out of everyday life.
For work or collaboration, the easiest way to reach me is a DM on X. @k_stone_works
COMPANY
- Representative
- Akira Toyozaki
- Address
- Wizard Building 402, 1-4-4 Asahicho, Nishi-ku, Yokohama, Kanagawa 220-0072, Japan