# Seismometer vs Sensor Toolkit

The clearest difference is price: Sensor Toolkit at Free against Seismometer's $1.99. Sensor Toolkit also leads on update cadence (every 3 weeks vs every 13 months). Seismometer's advantage is in-app purchases (none vs 4) and ads (none vs shown). On device support there is nothing between them.

Sensor Toolkit is free to download; Seismometer costs $1.99 up front. Sensor Toolkit sells 4 one-off in-app purchases. Seismometer asks for nothing beyond the download.

Seismometer ships an update every 13 months, Sensor Toolkit every 3 weeks. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Seismometer | Sensor Toolkit |
| --- | --- | --- |
| 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** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 13 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 3 MB | 54 MB |
| Requires iOS | **8.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [FFFF00 Agents AB](https://appshunter.io/developer/288966262) | [Dylan Calin](https://appshunter.io/developer/1832226530) |

## 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


### Sensor Toolkit

[App page](https://appshunter.io/ios/app/sensor-toolkit-smart-tools/id6758297155)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee Tip | $1.00 | one-time |
| SensorKit Pro | $1.99 | one-time |
| Pizza Tip | $2.00 | one-time |
| Diamond Tip | $5.00 | one-time |


## Frequently asked questions

### Is Seismometer free?

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

### Is Sensor Toolkit free?

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

### Do Seismometer or Sensor Toolkit have ads?

Sensor Toolkit shows ads; Seismometer does not.

### Which is updated more often, Seismometer or Sensor Toolkit?

Seismometer ships an update every 13 months, and Sensor Toolkit every 3 weeks. Most recently, Seismometer was updated on November 6, 2026 and Sensor Toolkit 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.*