# ServiceUnion Support vs HydroCalc Basic

The clearest difference is in-app purchases: ServiceUnion Support at none against HydroCalc Basic's 1. ServiceUnion Support also leads on iOS requirement (13.0 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. HydroCalc Basic sells 1 one-off in-app purchase. ServiceUnion Support asks for nothing beyond the download.

ServiceUnion Support ships an update weekly, HydroCalc Basic every 11 days. The most recent releases landed on October 3, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | ServiceUnion Support | HydroCalc Basic |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 11 days |
| Size | 26 MB | 35 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stimm Digital GmbH & Co. KG](https://appshunter.io/developer/1878175740) | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) |

## What reviewers say

### ServiceUnion Support

[App page](https://appshunter.io/ios/app/serviceunion-support/id1619795413)

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

**In-app purchases:** none


### HydroCalc Basic

[App page](https://appshunter.io/ios/app/hydrocalc-basic/id6752577110)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - Flow Units & Ad-Free | $1.99 | one-time |


## Frequently asked questions

### Is ServiceUnion Support free?

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

### Is HydroCalc Basic free?

HydroCalc Basic is free to download, with in-app purchases available.

### Do ServiceUnion Support or HydroCalc Basic have ads?

Neither ServiceUnion Support nor HydroCalc Basic shows ads.

### Which is updated more often, ServiceUnion Support or HydroCalc Basic?

ServiceUnion Support ships an update weekly, and HydroCalc Basic every 11 days. Most recently, ServiceUnion Support was updated on October 3, 2026 and HydroCalc Basic on October 4, 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.*