# RedLight vs Seismometer+

The clearest difference is price: Seismometer+ at Free against RedLight's $0.99. RedLight's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

Seismometer+ is free to download; RedLight costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | RedLight | Seismometer+ |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.5 (82 ratings)](https://appshunter.io/ios/app/seismometer-plus/id6739265160/reviews)** |
| Number of ratings | — | **82** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 16 months | — |
| Monetization | — | Ad-supported |
| Size | 2 MB | 3 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [domesticusdevelop](https://appshunter.io/developer/373834594) | [UniCom Technology](https://appshunter.io/developer/1270764210) |

## What reviewers say

### RedLight

[App page](https://appshunter.io/ios/app/redlight/id374982373)

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

**In-app purchases:** none


### Seismometer+

[App page](https://appshunter.io/ios/app/seismometer-plus/id6739265160)

Transform your device into a powerful seismometer to measure and visualize vibrations in real time. Track tremors, analyze surface stability, and explore the unseen movements around you with intuitive graphical displays. Perfect for science enthusiasts and the curious.

**Highlights:** Real-time X, Y, Z axis acceleration graphs, Cumulative vibration intensity analysis, Adjustable long-term data recording intervals, Dark mode display, Customizable graph update rates and sensitivity

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

**In-app purchases:** none


## Frequently asked questions

### Is RedLight free?

RedLight costs $0.99, with no in-app purchases.

### Is Seismometer+ free?

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

### Do RedLight or Seismometer+ have ads?

Seismometer+ shows ads; RedLight 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.*