# Critical vs Signal Lines

The clearest difference is in-app purchases: Signal Lines at none against Critical's 17. Signal Lines also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Critical sells 17 one-off in-app purchases. Signal Lines asks for nothing beyond the download.

## The numbers

| Metric | Critical | Signal Lines |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (147 ratings)](https://appshunter.io/ios/app/critical-incremental-reactor/id6446354857/reviews)** | — |
| Number of ratings | **147** | — |
| Positive reviews | 18.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | — |
| Monetization | Free with in-app purchases | — |
| Size | 99 MB | 63 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [WaffleStack Studio LLC](https://appshunter.io/developer/1523413949) | [Mladen Stojanovic](https://appshunter.io/developer/1884306383) |

## What reviewers say

### Critical

[App page](https://appshunter.io/ios/app/critical-incremental-reactor/id6446354857)

Manage a reactor to prevent it from becoming critical by delivering water. Earn money over time to unlock permanent upgrades and improve your survival capabilities. Invest wisely to extend your runs and uncover secrets.

**Highlights:** Reactor management, Incremental income generation, Permanent upgrades, Research and secrets, Survival gameplay

**Features:** macOS Compatibility

**In-app purchases (17)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 100 Gems | $2.99 | one-time |
| 100 Gems | $4.99 | one-time |
| Remove Ads | $7.99 | one-time |
| 225 Gems | $7.99 | one-time |
| Starter Pack | $9.99 | one-time |
| Remove All Ads | $9.99 | one-time |
| 225 Gems | $9.99 | one-time |
| 500 Gems | $9.99 | one-time |
| Pro Pack | $9.99 | one-time |
| Pro Pack | $14.99 | one-time |
| New Player Sale | $14.99 | one-time |
| 500 Gems | $14.99 | one-time |
| 1400 Gems | $19.99 | one-time |
| 800 Gems | $19.99 | one-time |
| 1400 Gems | $29.99 | one-time |
| 3000 Gems | $29.99 | one-time |
| 3000 Gems | $39.99 | one-time |


### Signal Lines

[App page](https://appshunter.io/ios/app/signal-lines/id6789048034)

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

**In-app purchases:** none


## Frequently asked questions

### Is Critical free?

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

### Is Signal Lines free?

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

### Do Critical or Signal Lines have ads?

Critical shows ads; Signal Lines does not.

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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.*