# Fault vs Seismometer ∞

The clearest difference is ads: Fault at none against Seismometer ∞'s shown. Seismometer ∞'s advantage is iOS requirement (17.0 vs 26.2). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Fault | Seismometer ∞ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | — | Every 2 weeks |
| Size | 3 MB | 16 MB |
| Requires iOS | 26.2 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kshitij Jhangra](https://appshunter.io/developer/1674681035) | [辰巳家有限公司](https://appshunter.io/developer/1781943256) |

## What reviewers say

### Fault

[App page](https://appshunter.io/ios/app/fault-real-time-seismograph/id6759371861)

**In-app purchases:** none


### Seismometer ∞

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

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

**In-app purchases:** none


## Frequently asked questions

### Is Fault free?

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

### Is Seismometer ∞ free?

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

### Do Fault or Seismometer ∞ have ads?

Seismometer ∞ shows ads; Fault 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.*