# RKI OPLS vs OnSite Supervisor

The clearest difference is iOS requirement: OnSite Supervisor at 13.2 against RKI OPLS's 16.0. On price, update cadence, ads 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.

RKI OPLS ships an update every 2 months, OnSite Supervisor monthly. The most recent releases landed on July 7, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | RKI OPLS | OnSite Supervisor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rki-opls/id1502872792/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | — |
| Size | 55 MB | 15 MB |
| Requires iOS | 16.0 | **13.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [RKI Instruments, Inc.](https://appshunter.io/developer/1501378948) | [James Blasdell](https://appshunter.io/developer/1755364496) |

## 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


### OnSite Supervisor

[App page](https://appshunter.io/ios/app/onsite-supervisor/id6511245507)

**In-app purchases:** none


## Frequently asked questions

### Is RKI OPLS free?

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

### Is OnSite Supervisor free?

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

### Do RKI OPLS or OnSite Supervisor have ads?

Neither RKI OPLS nor OnSite Supervisor shows ads.

### Which is updated more often, RKI OPLS or OnSite Supervisor?

RKI OPLS ships an update every 2 months, and OnSite Supervisor monthly. Most recently, RKI OPLS was updated on July 7, 2026 and OnSite Supervisor on September 8, 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.*