# DD Mate vs HydroCalc Basic

The clearest difference is in-app purchases: DD Mate at none against HydroCalc Basic's 1. HydroCalc Basic's advantage is update cadence (every 11 days vs every 8 months). On price, ads, device support and iOS requirement there is nothing between them.

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

DD Mate ships an update every 8 months, HydroCalc Basic every 11 days. The most recent releases landed on September 30, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | DD Mate | HydroCalc Basic |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 11 days** |
| Size | 31 MB | 35 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DigiDevice Srl](https://appshunter.io/developer/1643695021) | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) |

## What reviewers say

### DD Mate

[App page](https://appshunter.io/ios/app/dd-mate/id6458102882)

**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 DD Mate free?

DD Mate 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 DD Mate or HydroCalc Basic have ads?

Neither DD Mate nor HydroCalc Basic shows ads.

### Which is updated more often, DD Mate or HydroCalc Basic?

DD Mate ships an update every 8 months, and HydroCalc Basic every 11 days. Most recently, DD Mate was updated on September 30, 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.*