sumikiri

Digital tools for a simpler life

Tools for the moments when the numbers matter.

Small offline tools that turn a complicated decision into something you can actually see clearly — from wedding budgets to property decisions and beyond.

Free · no account · nothing uploaded

Try one of the tools right now, in your browser

The Decision Tool, free web version: thirteen questions, about a minute, and a direction on the thing you keep going back and forth on. Open it →

One fileDownload it, double-click it, it opens in your browser.
No accountNothing to sign up for, nothing to install.
No subscriptionBuy it once. Nobody can raise the price on you.
Nothing uploadedYour figures never leave your computer.

The tools

Each one does a single job properly. You supply the figures you know; it handles the arithmetic, the timing and the what-ifs.

The workbooks

Printable breathing and drawing practices. The originals this shop started with, still here.

Why not a spreadsheet

A template gives you empty boxes. These give you the answer. Enter what you know and the file handles the calculations, allocations, deadlines and what-ifs — then tells you plainly when the answer is no.

How the tools work ›