# Missing Digits vs Neon Spire

The clearest difference is in-app purchases: Neon Spire at none against Missing Digits's 1. Neon Spire also leads on update cadence (every 4 days vs monthly) and iOS requirement (15.0 vs 17.0). Missing Digits's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Missing Digits sells 1 one-off in-app purchase. Neon Spire asks for nothing beyond the download.

Missing Digits ships an update monthly, Neon Spire every 4 days. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Missing Digits | Neon Spire |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 4 days** |
| Size | 1 MB | 75 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [torankirite](https://appshunter.io/developer/1883564850) | [HARADA ISSEI](https://appshunter.io/developer/6799936385) |

## What reviewers say

### Missing Digits

[App page](https://appshunter.io/ios/app/missing-digits-math-puzzle/id6799607537)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | one-time |


### Neon Spire

[App page](https://appshunter.io/ios/app/neon-spire-stack-tower/id6799936383)

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

**In-app purchases:** none


## Frequently asked questions

### Is Missing Digits free?

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

### Is Neon Spire free?

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

### Do Missing Digits or Neon Spire have ads?

Neon Spire shows ads; Missing Digits does not.

### Which is updated more often, Missing Digits or Neon Spire?

Missing Digits ships an update monthly, and Neon Spire every 4 days. Most recently, Missing Digits was updated on October 25, 2026 and Neon Spire on October 29, 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.*