# Oklyn vs RBTI Journal

The clearest difference is in-app purchases: Oklyn at none against RBTI Journal's 2. Oklyn also leads on ads (none vs shown) and iOS requirement (13.0 vs 17.0). On price, update cadence and device support there is nothing between them.

Both are free to download. RBTI Journal sells 2 one-off in-app purchases. Oklyn asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Oklyn | RBTI Journal |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 20 MB | 32 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Tuxtla SAS](https://appshunter.io/developer/1679953492) | [SEVELINA LLP](https://appshunter.io/developer/866973748) |

## What reviewers say

### Oklyn

[App page](https://appshunter.io/ios/app/oklyn/id1364957029)

This app connects to a smart pool device to monitor water quality, optimize filtration, and automate pool maintenance. It allows remote control of pool equipment and provides real-time data and historical analysis for efficient pool care.

**Highlights:** Water quality analysis (pH, RedOx, Temp), Filtration optimization, Automated active winterization, Maintenance advice, Remote pool equipment control, Leak detection in technical room

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

**In-app purchases:** none


### RBTI Journal

[App page](https://appshunter.io/ios/app/rbti-journal/id6753671940)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI analysis for 1 month | $3.99 | one-time |
| AI analysis for 1 year | $24.99 | one-time |


## Frequently asked questions

### Is Oklyn free?

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

### Is RBTI Journal free?

RBTI Journal is free to download, with in-app purchases available.

### Do Oklyn or RBTI Journal have ads?

RBTI Journal shows ads; Oklyn does not.

### Which is updated more often, Oklyn or RBTI Journal?

Oklyn ships an update every 2 months, and RBTI Journal every 2 months. Most recently, Oklyn was updated on October 25, 2026 and RBTI Journal on October 24, 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.*