# Öltankschau vs UWS WaterBoy

The clearest difference is update cadence: UWS WaterBoy at every 3 weeks against Öltankschau's every 11 months. Öltankschau's advantage is iOS requirement (9.3 vs 15.0). 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.

Öltankschau ships an update every 11 months, UWS WaterBoy every 3 weeks. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Öltankschau | UWS WaterBoy |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 31 MB | 31 MB |
| Requires iOS | **9.3** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ConSoft](https://appshunter.io/developer/397747217) | [UWS Technologie GmbH](https://appshunter.io/developer/1796564865) |

## What reviewers say

### Öltankschau

[App page](https://appshunter.io/ios/app/oltankschau/id1295099783)

This app provides a quick and objective assessment of heating oil tank systems. It follows current regulations from AwSV and TRwS, specifically TRwS 791-1 and 2. More information is available on the developer's website.

**Highlights:** Objective assessment of heating oil tanks, Follows AwSV and TRwS regulations, Quick system evaluation, Detailed regulatory guidance

**Features:** macOS Compatibility

**In-app purchases:** none


### UWS WaterBoy

[App page](https://appshunter.io/ios/app/uws-waterboy/id6742050402)

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

**In-app purchases:** none


## Frequently asked questions

### Is Öltankschau free?

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

### Is UWS WaterBoy free?

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

### Do Öltankschau or UWS WaterBoy have ads?

Neither Öltankschau nor UWS WaterBoy shows ads.

### Which is updated more often, Öltankschau or UWS WaterBoy?

Öltankschau ships an update every 11 months, and UWS WaterBoy every 3 weeks. Most recently, Öltankschau was updated on October 24, 2026 and UWS WaterBoy on October 30, 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.*