# Sentron vs ColorMetric

The clearest difference is in-app purchases: Sentron at none against ColorMetric's 1. Sentron also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). ColorMetric's advantage is update cadence (weekly vs every 5 weeks). On price and ads there is nothing between them.

Both are free to download. ColorMetric sells 1 in-app purchase, starting at $9.99 per year. Sentron asks for nothing beyond the download.

Sentron ships an update every 5 weeks, ColorMetric weekly. The most recent releases landed on September 22, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Sentron | ColorMetric |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/sentron/id1623135557/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Weekly** |
| Monetization | Free | — |
| Size | 94 MB | 6 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sentron Europe B.V.](https://appshunter.io/developer/1623135559) | [Lance Zukel](https://appshunter.io/developer/1874053672) |

## What reviewers say

### Sentron

[App page](https://appshunter.io/ios/app/sentron/id1623135557)

Transform your mobile device into a sophisticated pH meter. Connect wirelessly to specialized probes for accurate measurements in various applications. The app guides you through calibration, data logging, and export.

**Highlights:** Wireless pH/EC measurement, Bluetooth probe connectivity, Step-by-step calibration, Data logging and graphing, GPS data mapping, Automatic temperature compensation

**In-app purchases:** none


### ColorMetric

[App page](https://appshunter.io/ios/app/colormetric/id6758633408)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ColorMetric Annual Ad Free | $9.99 | per year |


## Frequently asked questions

### Is Sentron free?

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

### Is ColorMetric free?

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

### Do Sentron or ColorMetric have ads?

Neither Sentron nor ColorMetric shows ads.

### Which is updated more often, Sentron or ColorMetric?

Sentron ships an update every 5 weeks, and ColorMetric weekly. Most recently, Sentron was updated on September 22, 2026 and ColorMetric on September 9, 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.*