# Primes vs RiddleSum

The clearest difference is in-app purchases: Primes at none against RiddleSum's 1. Primes also leads on ads (none vs shown) and iOS requirement (8.0 vs 16.0). On price, update cadence and device support there is nothing between them.

Both are free to download. RiddleSum sells 1 one-off in-app purchase. Primes asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Primes | RiddleSum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (10 ratings)](https://appshunter.io/ios/app/riddlesum-math-puzzle/id6474078443/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | — | Ad-supported |
| Size | 34 MB | 20 MB |
| Requires iOS | **8.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Aleniq Inc.](https://appshunter.io/developer/1529767352) | [Dmitriy Romanov](https://appshunter.io/developer/689955162) |

## What reviewers say

### Primes

[App page](https://appshunter.io/ios/app/primes/id1529767350)

**Features:** macOS Compatibility

**In-app purchases:** none


### RiddleSum

[App page](https://appshunter.io/ios/app/riddlesum-math-puzzle/id6474078443)

This number puzzle game challenges you to balance rows and columns by selecting the correct numbers. It offers a relaxing, clean design with hundreds of handcrafted puzzles to sharpen logic and mental math skills at your own pace.

**Highlights:** Hundreds of handcrafted puzzles, Clean and minimal design, Helpful hints, No timers, solve at your own pace, Daily brain workout, Logic and mental math training

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is Primes free?

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

### Is RiddleSum free?

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

### Do Primes or RiddleSum have ads?

RiddleSum shows ads; Primes does not.

### Which is updated more often, Primes or RiddleSum?

Primes ships an update every 2 months, and RiddleSum every 2 months. Most recently, Primes was updated on October 25, 2026 and RiddleSum on October 24, 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.*