# RKI OPLS vs Guardhat

The clearest difference is iOS requirement: Guardhat at 14.0 against RKI OPLS's 16.0. On price, rating, ratings volume and update cadence 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 RKI OPLS against 5.0 for Guardhat. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | RKI OPLS | Guardhat |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/rki-opls/id1502872792/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/guardhat/id1615000582/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | Free |
| Size | 55 MB | 33 MB |
| Requires iOS | 16.0 | **14.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RKI Instruments, Inc.](https://appshunter.io/developer/1501378948) | [Guardhat Inc.](https://appshunter.io/developer/1615000584) |

## What reviewers say

### 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


### Guardhat

[App page](https://appshunter.io/ios/app/guardhat/id1615000582)

This app transforms your phone into a safety and collaboration tool for industrial environments. It offers features like SOS alerts, fall detection, and secure communication to enhance worker safety and efficiency.

**Highlights:** SOS and worker-down alerts, Fall detection, Proximity and geofence violation alerts, Audio-visual calling and PTT, Lone worker check-ins, Gas detection monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RKI OPLS free?

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

### Is Guardhat free?

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

### Which has better reviews, RKI OPLS or Guardhat?

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

### Do RKI OPLS or Guardhat have ads?

Neither RKI OPLS nor Guardhat shows ads.

### Which is updated more often, RKI OPLS or Guardhat?

RKI OPLS ships an update every 2 months, and Guardhat every 2 months. Most recently, RKI OPLS was updated on September 25, 2026 and Guardhat on October 30, 2026.

---

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