# RK Link vs RKI OPLS

The clearest difference is update cadence: RKI OPLS at every 2 months against RK Link's every 4 months. RK Link's advantage is iOS requirement (13.0 vs 16.0). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for RK Link against 5.0 for RKI OPLS. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

RK Link ships an update every 4 months, RKI OPLS every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | RK Link | RKI OPLS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/rk-link/id1422964820/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/rki-opls/id1502872792/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 16 MB | 55 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [理研計器株式会社](https://appshunter.io/developer/1422964819) | [RKI Instruments, Inc.](https://appshunter.io/developer/1501378948) |

## What reviewers say

### RK Link

[App page](https://appshunter.io/ios/app/rk-link/id1422964820)

Connect a portable gas monitor to your smartphone via Bluetooth to receive real-time alerts for gas, man-down, and panic alarms. Automatically send emergency emails with location data to up to 100 registered destinations. View gas concentrations and adjust device settings remotely.

**Highlights:** Real-time alarm alerts (gas, man-down, panic), Automatic emergency email notifications, GPS location data in alerts, Gas concentration display, Remote device setting changes, Up to 100 email destinations

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

**In-app purchases:** none


### RKI OPLS

[App page](https://appshunter.io/ios/app/rki-opls/id1502872792)

Monitor readings and detector status for RKI's OPLS detector. Adjust operational parameters remotely. Essential for managing environmental monitoring equipment.

**Highlights:** View detector readings, Check detector status, Change operation parameters, Remote monitoring, Device management

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RK Link free?

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

### Is RKI OPLS free?

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

### Which has better reviews, RK Link or RKI OPLS?

RK Link and RKI OPLS are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do RK Link or RKI OPLS have ads?

Neither RK Link nor RKI OPLS shows ads.

### Which is updated more often, RK Link or RKI OPLS?

RK Link ships an update every 4 months, and RKI OPLS every 2 months. Most recently, RK Link was updated on November 2, 2026 and RKI OPLS on November 3, 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.*