# Number Blocks vs Error 503

The clearest difference is in-app purchases: Error 503 at none against Number Blocks's 2. Error 503 also leads on ads (none vs shown) and update cadence (every 2 days vs every 2 months). Number Blocks's advantage is iOS requirement (13.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Number Blocks sells 2 one-off in-app purchases. Error 503 asks for nothing beyond the download.

Number Blocks ships an update every 2 months, Error 503 every 2 days. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Number Blocks | Error 503 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (648 ratings)](https://appshunter.io/ios/app/number-blocks-run-games/id6463415559/reviews)** | — |
| Number of ratings | **648** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 170 MB | 182 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 9+ |
| Developer | [8Great, Games LLC](https://appshunter.io/developer/1680456883) | [Ana Goncalves](https://appshunter.io/developer/1852468740) |

## What reviewers say

### Number Blocks

[App page](https://appshunter.io/ios/app/number-blocks-run-games/id6463415559)

Control a character that grows in value by collecting blocks. Slide to dodge obstacles that reduce your number and aim to finish the race with the highest possible value.

**Highlights:** Slide to control character, Collect number blocks, Dodge shrinking obstacles, Grow your number value, Finish race with largest value

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gems Pack for Number Blocks | $3.99 | one-time |
| Combo Pack For Number Blocks | $4.99 | one-time |


### Error 503

[App page](https://appshunter.io/ios/app/error-503/id6755182586)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Number Blocks free?

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

### Is Error 503 free?

Error 503 is free to download, with no in-app purchases.

### Do Number Blocks or Error 503 have ads?

Number Blocks shows ads; Error 503 does not.

### Which is updated more often, Number Blocks or Error 503?

Number Blocks ships an update every 2 months, and Error 503 every 2 days. Most recently, Number Blocks was updated on October 30, 2026 and Error 503 on October 28, 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.*