# Prolog vs MemoryBalls+

The clearest difference is iOS requirement: Prolog at 17.6 against MemoryBalls+'s 26.2. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 2 days. The most recent releases landed on September 20, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Prolog | MemoryBalls+ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 days | Every 2 days |
| Size | 55 MB | 6 MB |
| Requires iOS | **17.6** | 26.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Elever (CA)](https://appshunter.io/developer/1769030097) | [Suwhan Baek](https://appshunter.io/developer/1871617009) |

## What reviewers say

### Prolog

[App page](https://appshunter.io/ios/app/prolog-screen-time-and-focus/id6695728427)

**Features:** macOS Compatibility

**In-app purchases:** none


### MemoryBalls+

[App page](https://appshunter.io/ios/app/memoryballs-plus/id6758871621)

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

**In-app purchases:** none


## Frequently asked questions

### Is Prolog free?

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

### Is MemoryBalls+ free?

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

### Do Prolog or MemoryBalls+ have ads?

Neither Prolog nor MemoryBalls+ shows ads.

### Which is updated more often, Prolog or MemoryBalls+?

Prolog ships an update every 2 days, and MemoryBalls+ every 2 days. Most recently, Prolog was updated on September 20, 2026 and MemoryBalls+ on September 18, 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.*