# Seismometer ∞ vs Pocket Seismograph

The clearest difference is ads: Pocket Seismograph at none against Seismometer ∞'s shown. Pocket Seismograph also leads on iOS requirement (13.0 vs 17.0). Seismometer ∞'s advantage is update cadence (every 2 weeks vs every 3 months). 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.

Seismometer ∞ ships an update every 2 weeks, Pocket Seismograph every 3 months. Both last shipped on November 5, 2026.

## The numbers

| Metric | Seismometer ∞ | Pocket Seismograph |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Size | 16 MB | 23 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [辰巳家有限公司](https://appshunter.io/developer/1781943256) | [lapnito.cz s.r.o.](https://appshunter.io/developer/1577358577) |

## What reviewers say

### Seismometer ∞

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

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

**In-app purchases:** none


### Pocket Seismograph

[App page](https://appshunter.io/ios/app/pocket-seismograph-vibration/id6766446046)

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

**In-app purchases:** none


## Frequently asked questions

### Is Seismometer ∞ free?

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

### Is Pocket Seismograph free?

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

### Do Seismometer ∞ or Pocket Seismograph have ads?

Seismometer ∞ shows ads; Pocket Seismograph does not.

### Which is updated more often, Seismometer ∞ or Pocket Seismograph?

Seismometer ∞ ships an update every 2 weeks, and Pocket Seismograph every 3 months. Most recently, Seismometer ∞ was updated on November 5, 2026 and Pocket Seismograph on November 5, 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.*