by Lethal Arts

Math that gets
out of the way.

We make focused calculator apps for people who build, cook, and create. No account. No ads in the results. Just the answer — right now, on your phone.

The Apps

Each one does a single job — for the people who actually need it done right.

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ShopMath
For the workshop, the garage, and the job site.
  • Fractional inch conversions at 1/64" precision — the #1 thing generic converters get wrong
  • Bolt circle calculator — BCD, hole count, X/Y coordinates
  • Wrench equivalent finder — "I lost my 10mm, what imperial fits?"
  • Drill bit cross-reference: fractional, number gauge, letter, metric
  • Board feet, torque, wire gauge, sheet metal gauge
  • Camera-based circle detection (Pro)
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Screenshots coming soon
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KitchenMath
For home cooks and serious bakers.
  • Recipe scaling that speaks your language — "1 1/2 cups", not "354.88 ml"
  • Volume and weight conversions: cups, tablespoons, ounces, grams, and more
  • Temperature converter with named oven temps ("350°F = Moderate oven")
  • Auto unit promotion — scaled 48 tsp? It suggests 1 cup instead
  • No login, no cloud, no nonsense — works fully offline
📱
Screenshots coming soon

See it in action

A quick look at what makes these different from a generic converter app.

Demo video coming soon

Why we built these

Generic converters are made for everyone. These are made for you.

🎯

Built for the task

ShopMath knows what fractional inches are. KitchenMath knows what "1 1/4 cups" means. Generic apps don't.

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No account required

Everything runs locally on your device. There's no server, no login, no syncing — nothing to sign up for.

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One-time Pro unlock

No subscriptions. Pay once for Pro features — or use the free tier forever. We won't beg you to upgrade.

Fast by design

Results update as you type. No loading spinners, no network calls, no waiting.