# Voltline vs Singularity Inc.

The clearest difference is ads: Voltline at none against Singularity Inc.'s shown. Singularity Inc.'s advantage is update cadence (every 8 days vs every 4 weeks) and iOS requirement (15.1 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Voltline sells 1 one-off in-app purchase and Singularity Inc. sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Voltline ships an update every 4 weeks, Singularity Inc. every 8 days. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Voltline | Singularity Inc. |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 weeks | **Every 8 days** |
| Size | 13 MB | 103 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 9+ | 9+ |
| Developer | [Olof Petterson](https://appshunter.io/developer/1808256024) | [Raman Bahdanovich](https://appshunter.io/developer/6786058290) |

## What reviewers say

### Voltline

[App page](https://appshunter.io/ios/app/voltline-tower-defense/id6760507113)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Voltline PRO | $2.99 | one-time |


### Singularity Inc.

[App page](https://appshunter.io/ios/app/singularity-inc/id6786058288)

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

**In-app purchases (1)**

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


## Frequently asked questions

### Is Voltline free?

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

### Is Singularity Inc. free?

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

### Do Voltline or Singularity Inc. have ads?

Singularity Inc. shows ads; Voltline does not.

### Which is updated more often, Voltline or Singularity Inc.?

Voltline ships an update every 4 weeks, and Singularity Inc. every 8 days. Most recently, Voltline was updated on October 28, 2026 and Singularity Inc. on October 25, 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.*