# Seismometer ∞ vs TremorGauge

The clearest difference is in-app purchases: Seismometer ∞ at none against TremorGauge's 2. TremorGauge's advantage is ads (none vs shown) and iOS requirement (15.0 vs 17.0). On price, update cadence and device support there is nothing between them.

Both are free to download. TremorGauge sells 2 in-app purchases, starting at $1.59 per 7 days. Seismometer ∞ asks for nothing beyond the download.

Seismometer ∞ ships an update every 2 weeks, TremorGauge every 3 weeks. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Seismometer ∞ | TremorGauge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Size | 16 MB | 1 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [辰巳家有限公司](https://appshunter.io/developer/1781943256) | [杰 向](https://appshunter.io/developer/1860305678) |

## What reviewers say

### Seismometer ∞

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

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

**In-app purchases:** none


### TremorGauge

[App page](https://appshunter.io/ios/app/tremorgauge-vibration/id6762075129)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TremorGauge Pro Weekly | $1.59 | per 7 days |
| TremorGauge Pro Yearly | $19.90 | per year |


## Frequently asked questions

### Is Seismometer ∞ free?

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

### Is TremorGauge free?

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

### Do Seismometer ∞ or TremorGauge have ads?

Seismometer ∞ shows ads; TremorGauge does not.

### Which is updated more often, Seismometer ∞ or TremorGauge?

Seismometer ∞ ships an update every 2 weeks, and TremorGauge every 3 weeks. Most recently, Seismometer ∞ was updated on October 24, 2026 and TremorGauge on October 31, 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.*