Who makes these
Hi, I'm Wataru. Father, solopreneur, and student of life. I build small, sharp tools that solve real problems, starting with my own friction points.
How they're made
AI tools are involved in making these spreadsheets, with a human at every step. I decide what goes into each file, and nothing ships until I've checked it.
- Every file is recalculated and every total is checked against an independent calculation before release.
- Product photos are actual screenshots with sample data.
- The files are plain formulas: no macros, no add-ons, no AI inside, and nothing you type leaves your copy.
Get in touch
A question, a formula that isn't behaving, or an idea for a spreadsheet you wish existed.