# Seismometer ∞ vs EMF Detector

The clearest difference is in-app purchases: Seismometer ∞ at none against EMF Detector's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. EMF Detector sells 1 one-off in-app purchase. Seismometer ∞ asks for nothing beyond the download.

Seismometer ∞ ships an update every 2 weeks, EMF Detector every 3 weeks. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Seismometer ∞ | EMF Detector |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Size | 16 MB | 25 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [辰巳家有限公司](https://appshunter.io/developer/1781943256) | [Ashir Mehmood](https://appshunter.io/developer/6809578079) |

## What reviewers say

### Seismometer ∞

[App page](https://appshunter.io/ios/app/seismometer/id6761700650)

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

**In-app purchases:** none


### EMF Detector

[App page](https://appshunter.io/ios/app/emf-detector-ghost-meter/id6809578077)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EMF Detector Pro | $4.99 | one-time |


## Frequently asked questions

### Is Seismometer ∞ free?

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

### Is EMF Detector free?

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

### Do Seismometer ∞ or EMF Detector have ads?

Both Seismometer ∞ and EMF Detector show ads.

### Which is updated more often, Seismometer ∞ or EMF Detector?

Seismometer ∞ ships an update every 2 weeks, and EMF Detector every 3 weeks. Most recently, Seismometer ∞ was updated on October 24, 2026 and EMF Detector on October 26, 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.*