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Private · Offline · Fast

Think with your brain.
Work with your thumbs.

Notes, math, unit conversions, and time zones — all in one scratchpad. Type a line, get an answer. Nothing leaves your device.

Coming soon to the App Store
▶ Coming soon to Google Play
thumbs.work adding up a dinner bill with tax, split four ways, plus a monthly budget

Calculate as you type

Every line evaluates instantly — no equals button, no modes. Plus a full scientific set: sqrt, log, trig, factorial, pi, e.

Convert anything

Length, volume, weight, temperature, data, speed, area, CSS units. Exact ratios, clean decimals.

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Skip the timezone math

“9am PST to UTC”, “time in Tokyo” — written the way you'd actually say it.

Many thumbs

Keep a scratchpad for everything. Rename, reorder, search, import and export.

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Private & offline

No account, no tracking, no network. Everything stays on your device.

Share & export

Send a thumb as text, or back it all up as JSON, Markdown, or CSV.

See it in action.

Real screens. Type it how you'd say it — the answer lands on the same line.

Every line calculates
Every line calculates
Convert anything
Convert anything
Across time zones
Across time zones
Math, built in
Math, built in

One app. Many thumbs.

A separate scratchpad for each corner of your life. Reorder them, rename them, keep them forever.

Groceries Travel Bills Budget Project Recipes
Groceries
$48.20 this trip
Trip to Japan
¥ → $ at a glance
Monthly bills
rent + utils + ⋯
Garden beds
sq ft & soil
“The calculator I always wanted on my phone — it reads like my notes, and every line just works.”
— the idea behind thumbs.work

A notepad for your thoughts.
A calculator for real life.

Coming soon to the App Store
▶ Coming soon to Google Play