# STOP vs Helix Protocol

The clearest difference is in-app purchases: STOP at none against Helix Protocol's 7. STOP also leads on iOS requirement (12.0 vs 16.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Helix Protocol sells 7 one-off in-app purchases. STOP asks for nothing beyond the download.

STOP ships an update every 10 days, Helix Protocol every 3 weeks. The most recent releases landed on October 9, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | STOP | Helix Protocol |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 10 days** | Every 3 weeks |
| Size | 30 MB | 45 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [ERX](https://appshunter.io/developer/513941286) | [Oleksii Poliakov](https://appshunter.io/developer/648955741) |

## What reviewers say

### STOP

[App page](https://appshunter.io/ios/app/stop-cell-pandemic/id860160123)

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

**In-app purchases:** none


### Helix Protocol

[App page](https://appshunter.io/ios/app/helix-protocol/id936490163)

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 50K Credits | $2.99 | one-time |
| 125K Credits | $5.99 | one-time |
| 175K Credits | $8.99 | one-time |
| 250K Credits | $12.99 | one-time |
| 500K Credits | $19.99 | one-time |
| 750K Credits | $24.99 | one-time |
| 1M Credits | $29.99 | one-time |


## Frequently asked questions

### Is STOP free?

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

### Is Helix Protocol free?

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

### Do STOP or Helix Protocol have ads?

Both STOP and Helix Protocol show ads.

### Which is updated more often, STOP or Helix Protocol?

STOP ships an update every 10 days, and Helix Protocol every 3 weeks. Most recently, STOP was updated on October 9, 2026 and Helix Protocol on October 8, 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.*