# Sensor Toolkit vs Seismometer ∞

The clearest difference is in-app purchases: Seismometer ∞ at none against Sensor Toolkit's 4. Sensor Toolkit's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 17.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Sensor Toolkit sells 4 one-off in-app purchases. Seismometer ∞ asks for nothing beyond the download.

Sensor Toolkit ships an update every 3 weeks, Seismometer ∞ every 2 weeks. The most recent releases landed on September 11, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Sensor Toolkit | Seismometer ∞ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 54 MB | 16 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Dylan Calin](https://appshunter.io/developer/1832226530) | [辰巳家有限公司](https://appshunter.io/developer/1781943256) |

## What reviewers say

### 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 |


### Seismometer ∞

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

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

**In-app purchases:** none


## Frequently asked questions

### Is Sensor Toolkit free?

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

### Is Seismometer ∞ free?

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

### Do Sensor Toolkit or Seismometer ∞ have ads?

Both Sensor Toolkit and Seismometer ∞ show ads.

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

Sensor Toolkit ships an update every 3 weeks, and Seismometer ∞ every 2 weeks. Most recently, Sensor Toolkit was updated on September 11, 2026 and Seismometer ∞ on September 12, 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.*