# Quadratic Master vs PSIS

The clearest difference is in-app purchases: PSIS at none against Quadratic Master's 1. PSIS also leads on device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Quadratic Master sells 1 one-off in-app purchase. PSIS asks for nothing beyond the download.

## The numbers

| Metric | Quadratic Master | PSIS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (333 ratings)](https://appshunter.io/ios/app/quadratic-master/id351899924/reviews)** | — |
| Number of ratings | **333** | — |
| Positive reviews | 73.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 77 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lukas Petr](https://appshunter.io/developer/820384324) | [Paññāsāstra University of Cambodia](https://appshunter.io/developer/1474826859) |

## What reviewers say

### Quadratic Master

[App page](https://appshunter.io/ios/app/quadratic-master/id351899924)

This app helps users solve and learn about quadratic equations, inequations, and functions. It offers tools for students and professionals, including solvers, formulas, and visual aids like 3D parabola models. Share solutions and explore function graphs with this educational math tool.

**Highlights:** Quadratic equation solver, Quadratic inequation solver, Quadratic function solver, 3D rotating parabola model, Graph mixer, Detailed solution explanations

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version | $3.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use
- 💡 Solves quadratic equations
- 🚫 No ads
- 📚 Helpful for homework
- 🚀 Handy for complicated equations

**What reviewers complain about**

- 🐛 Input keypad incomplete
- 🐛 App not working
- 🐛 Cannot enter problems
- 🐛 Not showing in app library
- 🐛 Cannot change addition to subtraction

**Reported bugs**

- Input keypad incomplete after iOS update
- App not working/unusable
- Cannot enter problems
- Not showing in app library
- Cannot change addition to subtraction

**Requested features**

- Ability to use large decimals/scientific notation
- Cooler icon
- Change standard formula to vertex form


### PSIS

[App page](https://appshunter.io/ios/app/psis-bkk/id6771326618)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Quadratic Master free?

Quadratic Master is free to download, with in-app purchases available.

### Is PSIS free?

PSIS is free to download, with no in-app purchases.

### Do Quadratic Master or PSIS have ads?

Neither Quadratic Master nor PSIS shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*