# Sentron vs Optical flow Analysis

The clearest difference is rating: Sentron at 3.0 against Optical flow Analysis's 1.0. Sentron also leads on ads (none vs shown) and monetization model (free vs ad-supported). Optical flow Analysis's advantage is update cadence (fortnightly vs every 5 weeks). On price, ratings volume and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Sentron holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Sentron ships an update every 5 weeks, Optical flow Analysis fortnightly. The most recent releases landed on October 8, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Sentron | Optical flow Analysis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/sentron/id1623135557/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/optical-flow-analysis/id6511216272/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | **Free** | Ad-supported |
| Size | 94 MB | 38 MB |
| Requires iOS | **15.0** | 17.7.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sentron Europe B.V.](https://appshunter.io/developer/1623135559) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## 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


### Optical flow Analysis

[App page](https://appshunter.io/ios/app/optical-flow-analysis/id6511216272)

Analyze motion between video frames and visualize object movement. This utility helps understand visual dynamics in sequences of images.

**Highlights:** Optical flow analysis, Visualize object movement, Frame-to-frame comparison, Motion tracking

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sentron free?

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

### Is Optical flow Analysis free?

Optical flow Analysis is free to download, with no in-app purchases.

### Which has better reviews, Sentron or Optical flow Analysis?

Sentron is rated higher. Sentron averages 3.0 out of 5 from 2 ratings, while Optical flow Analysis averages 1.0 from 1 ratings.

### Do Sentron or Optical flow Analysis have ads?

Optical flow Analysis shows ads; Sentron does not.

### Which is updated more often, Sentron or Optical flow Analysis?

Sentron ships an update every 5 weeks, and Optical flow Analysis fortnightly. Most recently, Sentron was updated on October 8, 2026 and Optical flow Analysis on October 4, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*