# Seismometer vs Seismometer ∞

The clearest difference is price: Seismometer ∞ at Free against Seismometer's $1.99. Seismometer ∞ also leads on update cadence (every 2 weeks vs every 13 months). Seismometer's advantage is ads (none vs shown) and iOS requirement (8.0 vs 17.0). On in-app purchases and device support there is nothing between them.

Seismometer ∞ is free to download; Seismometer costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Seismometer ships an update every 13 months, Seismometer ∞ every 2 weeks. The most recent releases landed on October 20, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Seismometer | Seismometer ∞ |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[3.3 (17 ratings)](https://appshunter.io/ios/app/seismometer/id288966259/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 64.7% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 13 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 3 MB | 16 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [FFFF00 Agents AB](https://appshunter.io/developer/288966262) | [辰巳家有限公司](https://appshunter.io/developer/1781943256) |

## What reviewers say

### Seismometer

[App page](https://appshunter.io/ios/app/seismometer/id288966259)

This app uses your device's accelerometer to detect and measure vibrations, shakes, and movements. It calculates the energy of these movements and displays them on a logarithmic scale, offering various signal filters and recording capabilities.

**Highlights:** Measure vibrations and movements, Uses device accelerometer, Calculates energy of movements, Logarithmic scale display, Signal filters, Recordings and CSV export, UDP Streaming

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Sensitive and accurate
- 👍 Great for demonstrating vibrations
- 👍 Useful for photography and audio
- 👍 Visually appealing
- 👍 Clever use of accelerometer

**What reviewers complain about**

- 🐛 Crashes frequently
- 🐛 Inaccurate readings even on flat surfaces
- 🔋 Drains battery quickly
- 🔒 No security or privacy features
- 👎 Limited functionality and customization

**Reported bugs**

- Crashes when trying to view recordings
- Unresponsive controls
- Incompatible with newer iPhone models
- Screen turns off unexpectedly

**Requested features**

- Pause and scroll back through recordings
- Save and email recorded data
- Adjustable sensitivity settings
- Richter scale or other measurement units
- Ability to record and review vibration history


### Seismometer ∞

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

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

**In-app purchases:** none


## Frequently asked questions

### Is Seismometer free?

Seismometer costs $1.99, with no in-app purchases.

### Is Seismometer ∞ free?

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

### Do Seismometer or Seismometer ∞ have ads?

Seismometer ∞ shows ads; Seismometer does not.

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

Seismometer ships an update every 13 months, and Seismometer ∞ every 2 weeks. Most recently, Seismometer was updated on October 20, 2026 and Seismometer ∞ on October 14, 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.*