# Or Simplex Step-by-Step Solver

> OR Solver (Simplex method, Branch-and-Bound, Transportation, Big M)

Canonical page: [https://chrome-stats.com/d/com.simplex](https://chrome-stats.com/d/com.simplex)

## Overview

- **ID:** `com.simplex`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Simplex Developers
- **Category:** EDUCATION
- **Downloads:** 89,106
- **Rating:** 4.61 / 5 (916 ratings)
- **Version:** 13.2.1
- **Last updated:** 2026-08-31
- **First published:** 2013-04-20
- **Publisher country:** UA
- **Size:** 14 MB
- **Data as of:** 2026-09-13
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.simplex)
- **Website:** [https://simplx.dev/](https://simplx.dev/)
- **Privacy policy:** [https://simplx.dev/privacy.html](https://simplx.dev/privacy.html)

## Description

**OR Simplex Step-by-Step** is an offline Android solver for Operations Research and linear programming. It supports classical, Two-Phase, and Big-M Simplex methods, Integer Programming with Branch and Bound, 2D graphical analysis, and 3D polytope visualization for three-variable problems.

The app also includes sensitivity and post-optimal analysis, transportation methods, MODI/U-V optimization, the Hungarian Assignment Algorithm, and Johnson’s Job Sequencing algorithms. Students can follow plain-language, step-by-step iterations, use exact fraction arithmetic, save problem history, and work in eight languages without an account, internet connection, or tracking.

## Rankings

- #233,033 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_ADSERVICES_AD_ID`
- `android.permission.ACCESS_ADSERVICES_ATTRIBUTION`
- `android.permission.ACCESS_ADSERVICES_TOPICS`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.Ad_ID`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.INTERNET`
- `android.permission.READ_EXTERNAL_STORAGE`
- `android.permission.WAKE_LOCK`
- `android.permission.WRITE_EXTERNAL_STORAGE`
- `com.android.vending.BILLING`
- `com.google.android.gms.permission.AD_ID`
- `com.simplex.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

## Review summary

Users find the Or Simplex Step-by-Step Solver app very helpful, accurate, and useful for teaching and solving linear programming problems. The app's multilingual support, including Persian, is appreciated, especially by those unable to afford English classes. However, several users mention limitations like restrictions on rows and columns, essential features locked behind payment, occasional app crashes, and language setting issues. Despite these drawbacks, the app is highly recommended for both students and educators in Operations Research.

### Pros

- App is very helpful and useful for solving simplex algorithm problems.
- Supports multiple languages, including Persian/Farsi, aiding non-English speakers.
- Highly recommended for students and teachers of Operations Research and linear programming.
- Offers a premium/pro version with additional features.
- Accurate and strong performance noted by users.

### Cons

- Limitations on adding rows and columns in the free version.
- Many features locked behind a paid/pro version.
- App crashes or stops working when using certain features, such as the dual option.
- Some users unable to change language to certain options, e.g., Farsi.
- Minimum constraints requirement is confusing or restrictive.

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