# Calcado: Math Speed Trainer

> Practice arithmetic across addition, subtraction, multiplication, division.

Canonical page: [https://chrome-stats.com/d/com.lightning.calcado.trainer](https://chrome-stats.com/d/com.lightning.calcado.trainer)

## Overview

- **ID:** `com.lightning.calcado.trainer`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** ASG Art
- **Category:** EDUCATION
- **Version:** 1.0.4
- **Last updated:** 2026-08-19
- **First published:** 2026-07-20
- **Publisher country:** PL
- **Size:** 29 MB
- **Data as of:** 2026-09-11
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.lightning.calcado.trainer)
- **Privacy policy:** [https://www.termsfeed.com/live/d51020ab-98e4-4bc0-bef4-713dd6b4e923](https://www.termsfeed.com/live/d51020ab-98e4-4bc0-bef4-713dd6b4e923)

## Description

Calcado is a math speed trainer built for anyone who wants to sharpen their mental calculation skills. No account needed, no internet required — just open the app and start practicing.<br><br>The core mechanic is simple: a problem appears on screen, you enter your answer using the built-in numpad, and you move on to the next one. The app tracks your accuracy and response times so you can see how you improve over sessions.<br><br>Supported operations cover addition, subtraction, multiplication, and division. You can mix them freely or focus on one at a time. Difficulty adjusts based on the number ranges you choose, so beginners and experienced mental calculators both have room to grow.<br><br>Session statistics are stored locally on your device. You can review past performance, spot which operation types slow you down, and target your practice accordingly. <br><br>There are no timers forcing you to rush unless you want them. A timed mode is available for those who enjoy the pressure, and a relaxed mode lets you focus purely on correctness.<br><br>The interface is clean and distraction-free. Dark and light themes are both supported, and the app respects your system preference automatically.

## Rankings

- #3,209,371 — Overall

## Permissions and access

### Permissions

- `android.permission.INTERNET`
- `android.permission.READ_EXTERNAL_STORAGE`
- `android.permission.SYSTEM_ALERT_WINDOW`
- `android.permission.VIBRATE`
- `android.permission.WRITE_EXTERNAL_STORAGE`
- `com.android.vending.CHECK_LICENSE`
- `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE`
- `com.lightning.calcado.trainer.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.lightning.calcado.trainer)