Kalkudam
Nine calculators · one app · zero tracking

Every calculator you need, in one place.

From the everyday simple keypad to AR room measurements and AI-assisted step-by-step solutions — Kalkudam runs the lot. Offline. Private. On every Apple device you own.

Free: Simple + Scientific. Everything else included with Kalkudam Pro.

Nine calculators that actually fit together

Each one is built around the same engine and the same history.

Simple calculator

Free

Exact base-10 arithmetic — 0.1 + 0.2 actually equals 0.3, not 0.30000000000000004. Memory, percent, sign toggle, and a rolling local history.

Scientific

Free

Trig in radians or degrees, logarithms, factorials, constants, x^y. Same immediate-execution feel as the simple keypad.

Unit conversion

Pro

Length, mass, area, volume, and the affine temperature scales — the formula handles a tilted plane the same way it handles a flat one.

BMI

Pro

Metric and imperial inputs against the WHO bands, with a visual scale. Screening metric, not medical advice — and the app says so.

Currency

Pro

Cached offline rates with a clear last-updated stamp. Indicative, not real-time — the in-app banner makes that clear, and so do we.

Bitcoin

Pro

BTC / mBTC / bit / sat conversions plus a fiat readout against the cached quote. Decimal money math throughout.

AI Math Solver

Pro

Ask in plain language; the on-device Apple Intelligence model proposes an answer, and our deterministic engine re-checks it before you see it. iOS 26+.

AR Measure

Pro

Distance, area, and volume in real space using ARKit. Most accurate on LiDAR devices; falls back gracefully where it isn't supported.

Universal history

Pro

Every result from every feature lands in one searchable, filterable timeline. Tap an entry to jump back to where it came from.

Privacy

Built so we have nothing to hand over.

Kalkudam collects no data, performs no tracking, and makes no network calls. Everything runs on your device. The App Store nutrition label reads Data Not Collected— and that's checked in by the privacy manifest we ship inside the app.

  • No analytics, no SDKs, no third-party packages

    The only dependency the app ships is Point-Free's Composable Architecture. SwiftMath was removed.

  • No networking

    Currency and Bitcoin run on a bundled, timestamped rate table. The AI Solver uses Apple Intelligence on-device only.

  • Camera access only for AR Measure

    Used while you're actively pointing — never recorded, never transmitted.

  • Preferences only

    UserDefaults stores last-used units and angle mode. That's the entirety of what gets written to disk on your behalf (declared per Apple's required-reason API category, CA92.1).

What we don't claim

Three things to be straight about.

Currency and Bitcoin rates are cached, not real-time.They're meant for ballpark conversions — confirm against a live source before transacting. The in-app screens label rates as cached with the date of the last update.

BMI is a screening metric, not medical advice.It doesn't account for muscle mass, body composition, age, or pregnancy. Talk to a healthcare professional for actual health decisions.

AR measurements have sensor variance. Even on LiDAR devices, expect a few centimetres of error on real-world surfaces. The geometry math itself is exact — the limit is the camera and tracking.

Every Apple device you own.

One purchase, one Apple ID — works wherever you've signed in.

iPhone

iOS 17+

iPad

iPadOS 17+

Mac

Designed for iPad on Apple Silicon

Vision Pro

Designed for iPad on visionOS

Apple Watch

watchOS 10+ companion

Ready when you are.

Free to download. Simple and Scientific are free forever. Kalkudam Pro adds every paid feature with a one-week free trial.

Questions? Read the support page or check the privacy policy.