# NumSys

> Number Systems Converter and Calculator with solution.

Canonical page: [https://chrome-stats.com/d/ru.sandello.binaryconverter](https://chrome-stats.com/d/ru.sandello.binaryconverter)

## Overview

- **ID:** `ru.sandello.binaryconverter`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Sandello
- **Category:** TOOLS
- **Downloads:** 165,580
- **Rating:** 4.88 / 5 (542 ratings)
- **Version:** 2.5.0
- **Last updated:** 2026-05-19
- **First published:** 2016-01-16
- **Publisher country:** RU
- **Size:** 5.86 MB
- **Data as of:** 2026-09-15
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=ru.sandello.binaryconverter)
- **Website:** [http://sandello.ru/](http://sandello.ru/)
- **Privacy policy:** [https://github.com/jedi1150/number-systems/blob/main/privacy-policy.md](https://github.com/jedi1150/number-systems/blob/main/privacy-policy.md)

## Description

NumSys is a simple and intuitive Chrome extension designed for converting and calculating across various number systems ranging from base 2 to base 36. It supports seamless conversion including decimal fractions, allowing users to easily switch between numeral bases. Beyond conversions, NumSys enables mathematical operations like addition, subtraction, multiplication, and division within different number systems, providing complete solutions for each calculation.

Ideal for students, educators, programmers, and anyone working with diverse numeral systems, NumSys streamlines complex computations with accuracy and efficiency. The extension also encourages community contributions through its GitHub repository, making it an evolving tool for all users needing reliable number system conversions and calculations.

## Rankings

- #174,960 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_ADSERVICES_AD_ID`
- `android.permission.ACCESS_ADSERVICES_ATTRIBUTION`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.INTERNET`
- `android.permission.WAKE_LOCK`
- `com.android.vending.CHECK_LICENSE`
- `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE`
- `com.google.android.gms.permission.AD_ID`
- `ru.sandello.binaryconverter.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

## Review summary

NumSys is praised for its modern, straightforward design, ad-free experience, and detailed explanations aiding learning of number systems. It is especially valued by students for converting various number bases effectively. However, users report app crashes when bases are changed without resetting results and a buggy input issue duplicating characters. Some request additional features like support for non-positional systems and enhanced explanation content. Data usage on app launch is a concern, and a few users suggest replacing optional ads with a donation model.

### Pros

- User-friendly and straightforward interface with a modern look.
- Provides detailed explanations for calculations which help in learning.
- No advertisements, making the app experience uninterrupted and pleasant.
- Useful for students and anyone interested in number systems as a learning tool.
- Reliable and effective in converting various number bases.

### Cons

- App crashes when the results are not reset before changing the base.
- Input issue where typing hexadecimal values like 'A5' results in incorrect duplication such as 'AA5'.
- Consumes 5-6MB of data each time it is opened without clear reason.
- Feature requests for support of non-positional number systems like Gray code, Excess-3, and BCD.
- Some users desire more detailed explanations and an option to donate instead of ads.

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Source: [Chrome-Stats](https://chrome-stats.com/d/ru.sandello.binaryconverter)