# Calibration Keeper vs Sensor Technology Engineering

The clearest difference is update cadence: Sensor Technology Engineering at every 7 months against Calibration Keeper's every 16 months. Sensor Technology Engineering also leads on iOS requirement (13.0 vs 15.1). On price, ads, 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.

Calibration Keeper ships an update every 16 months, Sensor Technology Engineering every 7 months. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Calibration Keeper | Sensor Technology Engineering |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 7 months** |
| Size | 22 MB | 94 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Trihydro Corporation](https://appshunter.io/developer/920601995) | [Sensor Technology Engineering](https://appshunter.io/developer/1668239053) |

## What reviewers say

### Calibration Keeper

[App page](https://appshunter.io/ios/app/calibration-keeper/id1465790622)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sensor Technology Engineering

[App page](https://appshunter.io/ios/app/sensor-technology-engineering/id1627959712)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calibration Keeper free?

Calibration Keeper is free to download, with no in-app purchases.

### Is Sensor Technology Engineering free?

Sensor Technology Engineering is free to download, with no in-app purchases.

### Do Calibration Keeper or Sensor Technology Engineering have ads?

Neither Calibration Keeper nor Sensor Technology Engineering shows ads.

### Which is updated more often, Calibration Keeper or Sensor Technology Engineering?

Calibration Keeper ships an update every 16 months, and Sensor Technology Engineering every 7 months. Most recently, Calibration Keeper was updated on October 26, 2026 and Sensor Technology Engineering on October 25, 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.*