# Modular Arithmetic vs Collatz Explorer

The clearest difference is price: Collatz Explorer at Free against Modular Arithmetic's $1.99. Collatz Explorer also leads on update cadence (monthly vs every 12 months). Modular Arithmetic's advantage is rating (5.0 vs 4.6) and device support (4 vs 1). On review sentiment, ratings volume, ads and in-app purchases there is nothing between them.

Collatz Explorer is free to download; Modular Arithmetic costs $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 4.6. Both are backed by a comparable volume of ratings — 4 and 7 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Modular Arithmetic ships an update every 12 months, Collatz Explorer monthly. The most recent releases landed on September 17, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Modular Arithmetic | Collatz Explorer |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/modular-arithmetic/id687735575/reviews)** | [4.6 (7 ratings)](https://appshunter.io/ios/app/collatz-explorer/id6755121221/reviews) |
| Number of ratings | 4 | **7** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Monthly** |
| Monetization | Paid | **Free** |
| Size | 2 MB | 1 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Benjamin Burton](https://appshunter.io/developer/687735578) | [Berk Sucu](https://appshunter.io/developer/1852063488) |

## What reviewers say

### 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


### Collatz Explorer

[App page](https://appshunter.io/ios/app/collatz-explorer/id6755121221)

Explore mathematical sequences with this app. It calculates the standard Collatz sequence for any number you enter and can also display sequences from an alternative 3x-1 function.

**Highlights:** Calculate Collatz sequences, Calculate 3x-1 function sequences, Input any number, Visualize sequences

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

**In-app purchases:** none


## Frequently asked questions

### Is Modular Arithmetic free?

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

### Is Collatz Explorer free?

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

### Which has better reviews, Modular Arithmetic or Collatz Explorer?

Modular Arithmetic is rated higher. Modular Arithmetic averages 5.0 out of 5 from 4 ratings, while Collatz Explorer averages 4.6 from 7 ratings.

### Do Modular Arithmetic or Collatz Explorer have ads?

Neither Modular Arithmetic nor Collatz Explorer shows ads.

### Which is updated more often, Modular Arithmetic or Collatz Explorer?

Modular Arithmetic ships an update every 12 months, and Collatz Explorer monthly. Most recently, Modular Arithmetic was updated on September 17, 2026 and Collatz Explorer on September 9, 2026.

---

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