# ESL assistant vs Ruby Wireless Sensor

The clearest difference is update cadence: Ruby Wireless Sensor at every 3 weeks against ESL assistant's every 4 months. ESL assistant's advantage is iOS requirement (12.0 vs 14.2). 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.

ESL assistant ships an update every 4 months, Ruby Wireless Sensor every 3 weeks. The most recent releases landed on May 17, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | ESL assistant | Ruby Wireless Sensor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ruby-wireless-sensor/id6473813823/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 22 MB | 76 MB |
| Requires iOS | **12.0** | 14.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yaliang Software Development Co., Ltd.](https://appshunter.io/developer/1104844863) | [Crystal Instruments Corporation](https://appshunter.io/developer/496441607) |

## What reviewers say

### ESL assistant

[App page](https://appshunter.io/ios/app/esl-assistant/id1565463349)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ruby Wireless Sensor

[App page](https://appshunter.io/ios/app/ruby-wireless-sensor/id6473813823)

Connect to a compact wireless sensor to monitor mechanical structures. View real-time vibration data and manage the device via Bluetooth.

**Highlights:** Connect via Bluetooth, Manage wireless sensors, View real-time vibration data, Monitor mechanical structures, Ultracompact device integration

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ESL assistant free?

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

### Is Ruby Wireless Sensor free?

Ruby Wireless Sensor is free to download, with no in-app purchases.

### Do ESL assistant or Ruby Wireless Sensor have ads?

Neither ESL assistant nor Ruby Wireless Sensor shows ads.

### Which is updated more often, ESL assistant or Ruby Wireless Sensor?

ESL assistant ships an update every 4 months, and Ruby Wireless Sensor every 3 weeks. Most recently, ESL assistant was updated on May 17, 2026 and Ruby Wireless Sensor on June 11, 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.*