# Pythagoras HD vs Modular Arithmetic

The clearest difference is review sentiment: Modular Arithmetic at 100% against Pythagoras HD's 43%. Modular Arithmetic also leads on rating (5.0 vs 1.0) and ratings volume (4 vs 1). Pythagoras HD's advantage is price ($0.99 vs $1.99). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

Pythagoras HD costs $0.99 and Modular Arithmetic $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Modular Arithmetic holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively. Written reviews point the same way: 43% of Pythagoras HD's written reviews are positive against 100% of Modular Arithmetic's.

Pythagoras HD ships an update every 24 months, Modular Arithmetic every 12 months. The most recent releases landed on October 11, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Pythagoras HD | Modular Arithmetic |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/pythagoras-hd/id404432708/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/modular-arithmetic/id687735575/reviews)** |
| Number of ratings | 1 | **4** |
| Positive reviews | 42.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 12 months** |
| Monetization | Paid | Paid |
| Size | 10 MB | 2 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Koksharov](https://appshunter.io/developer/700716922) | [Benjamin Burton](https://appshunter.io/developer/687735578) |

## What reviewers say

### Pythagoras HD

[App page](https://appshunter.io/ios/app/pythagoras-hd/id404432708)

Explore the Pythagorean Theorem through interactive puzzles and visual proofs. This educational app offers a unique, formula-free approach to understanding geometry. It's designed to make learning engaging and accessible.

**Highlights:** Visual proofs of Pythagorean Theorem, Interactive geometric puzzles, Formula-free learning, Engaging educational experience, iPad compatibility

**Features:** macOS Compatibility

**In-app purchases:** none


### Modular Arithmetic

[App page](https://appshunter.io/ios/app/modular-arithmetic/id687735575)

Perform calculations with remainders using a chosen modulus. Supports large numbers, fast modular division and exponentiation, and displays a full calculation transcript. Ideal for understanding modular arithmetic's applications in math and computer science.

**Highlights:** Fixed modulus selection, Arbitrarily large numbers, Fast modular division and exponentiation, Full calculation transcript, Order of operations convention, External keyboard and Siri Shortcuts support

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Pythagoras HD free?

Pythagoras HD costs $0.99, with no in-app purchases.

### Is Modular Arithmetic free?

Modular Arithmetic costs $1.99, with no in-app purchases.

### Which has better reviews, Pythagoras HD or Modular Arithmetic?

Modular Arithmetic is rated higher. Pythagoras HD averages 1.0 out of 5 from 1 ratings, while Modular Arithmetic averages 5.0 from 4 ratings.

### Do Pythagoras HD or Modular Arithmetic have ads?

Neither Pythagoras HD nor Modular Arithmetic shows ads.

### Which is updated more often, Pythagoras HD or Modular Arithmetic?

Pythagoras HD ships an update every 24 months, and Modular Arithmetic every 12 months. Most recently, Pythagoras HD was updated on October 11, 2026 and Modular Arithmetic on October 14, 2026.

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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.*