A clean, private calculator that never collects your data.
 Light Theme |
 Dark Theme |
 Scientific Functions |
 Calculation History |
 Landscape Mode |
 Foldable Support |
 AI Math Solver |
 On-Device Models |
 Solved On-Device |
- Full expression evaluation with parentheses and operator precedence
- Live result preview as you type
- Scientific functions — square root, pi, power, factorial
- Calculation history — persists across restarts
- Expression cursor — tap to edit mid-expression
- AI Math Solver — photograph handwritten math and solve it on-device (experimental; hidden until you unlock it — see below)
- Dynamic color theming that matches your wallpaper (Android 12+)
- Automatic light and dark mode
- Adaptive layout — portrait, landscape, and foldable support
- Haptic feedback and smooth animations
Point your camera at a handwritten math expression and let an on-device AI model solve it for you. Everything runs locally — no data leaves your device.
The AI Math Solver is hidden by default. To reveal it, rapidly tap AC seven times — the same idea as Android's "tap Build number 7 times" to unlock developer options. A countdown toast guides the final taps, and once unlocked a camera icon appears in the top-left corner. The unlock is remembered across restarts.
How it works:
- Unlock the feature (see above), then tap the camera icon (top-left)
- Choose and download an AI model (one-time, ~2.6–4.9 GB; the download runs in a background service and survives the screen turning off). Gated models (Gemma 3n) first prompt a one-tap Sign in with Hugging Face
- Take a photo with your camera, or choose an existing photo from your gallery
- The model solves it entirely on-device — GPU-accelerated where supported — and streams its working, rendered with proper math formatting
- Tap "Use" to insert the answer into the calculator
Available models:
All models are vision-capable and run on Google's LiteRT-LM on-device engine.
| Model | Download | Min RAM | Auth |
|---|---|---|---|
| Gemma 4 E2B | ~2.6 GB | 6 GB | — |
| Gemma 3n E2B | ~3.7 GB | 6 GB | HuggingFace sign-in |
| Gemma 4 E4B | ~3.7 GB | 8 GB | — |
| Gemma 3n E4B | ~4.9 GB | 8 GB | HuggingFace sign-in |
Requirements:
- Android device with 6+ GB RAM — the smallest model (Gemma 4 E2B) needs 6 GB and the larger E4B models need 8 GB; on devices with less, the solver shows a "not enough RAM" notice
- A camera or gallery app (photos are taken via the system camera — no in-app camera permission required)
- Internet for the one-time model download (Wi-Fi recommended)
- Gemma 3n models require a free HuggingFace account — you sign in once, in-app, and accept the model license; Gemma 4 models need no account (setup)
Powered by:
- Google LiteRT-LM — on-device multimodal LLM inference, GPU-accelerated with automatic CPU fallback
Every calculation you make is your business — not Big Tech's. Calculator M3 is a beautifully designed calculator built with Material 3 Expressive with zero data collection and zero analytics.
Unlike Google Calculator, this app doesn't phone home. No usage tracking, no telemetry, no ad frameworks buried in the code.
- No tracking
- No analytics
- No ads
- No data harvesting
- AI models run entirely on-device — no cloud processing
- Internet is only used to download AI models (optional, one-time)
- Kotlin + Jetpack Compose
- Material 3 Expressive design system
- BigDecimal high-precision arithmetic
- System camera + photo picker for image capture (no in-app camera permission)
- LiteRT-LM for on-device multimodal model inference (GPU-accelerated, CPU fallback)
- WorkManager foreground service for resumable background model downloads
- Markwon + jlatexmath for rendering the answer's math and markdown
CalculatorM3
Copyright (c) 2025-2026
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You can find a copy of the GNU General Public License v3 here https://www.gnu.org/licenses/
Your calculations stay on your device, period.