# The Sum vs PlusFix

The clearest difference is in-app purchases: The Sum at none against PlusFix's 3. PlusFix's advantage is update cadence (every 2 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. PlusFix sells 3 one-off in-app purchases. The Sum asks for nothing beyond the download.

The Sum ships an update every 3 weeks, PlusFix every 2 days. The most recent releases landed on September 18, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | The Sum | PlusFix |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 144 MB | 40 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [LIM SING CHYUAN](https://appshunter.io/developer/1825404821) | [young jun Cho](https://appshunter.io/developer/1872351854) |

## What reviewers say

### The Sum

[App page](https://appshunter.io/ios/app/the-sum-math-and-puzzle/id6757253249)

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

**In-app purchases:** none


### PlusFix

[App page](https://appshunter.io/ios/app/plusfix/id6758336687)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited ZeroPoint | $3.99 | one-time |
| Ad-Free Experince | $5.99 | one-time |
| Full Level Access | $7.99 | one-time |


## Frequently asked questions

### Is The Sum free?

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

### Is PlusFix free?

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

### Do The Sum or PlusFix have ads?

Both The Sum and PlusFix show ads.

### Which is updated more often, The Sum or PlusFix?

The Sum ships an update every 3 weeks, and PlusFix every 2 days. Most recently, The Sum was updated on September 18, 2026 and PlusFix on September 23, 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.*