# Graphos vs Collatz Explorer

The clearest difference is in-app purchases: Collatz Explorer at none against Graphos's 1. Collatz Explorer also leads on update cadence (monthly vs every 18 months). Graphos's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.6). On price and ads there is nothing between them.

Both are free to download. Graphos sells 1 one-off in-app purchase. Collatz Explorer asks for nothing beyond the download.

Graphos ships an update every 18 months, Collatz Explorer monthly. The most recent releases landed on October 5, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Graphos | Collatz Explorer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (7 ratings)](https://appshunter.io/ios/app/collatz-explorer/id6755121221/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 18 months | **Monthly** |
| Monetization | — | Free |
| Size | 5 MB | 1 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Bodnar Marin](https://appshunter.io/developer/1344307163) | [Berk Sucu](https://appshunter.io/developer/1852063488) |

## What reviewers say

### Graphos

[App page](https://appshunter.io/ios/app/graphos/id1477970952)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Graphos full version | $9.99 | one-time |


### 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 Graphos free?

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

### Is Collatz Explorer free?

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

### Do Graphos or Collatz Explorer have ads?

Neither Graphos nor Collatz Explorer shows ads.

### Which is updated more often, Graphos or Collatz Explorer?

Graphos ships an update every 18 months, and Collatz Explorer monthly. Most recently, Graphos was updated on October 5, 2026 and Collatz Explorer on September 27, 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.*