# Hydro Solar HP vs HydroCalc Basic

The clearest difference is in-app purchases: Hydro Solar HP at none against HydroCalc Basic's 1. Hydro Solar HP also leads on iOS requirement (12.2 vs 15.1). HydroCalc Basic's advantage is update cadence (every 11 days vs every 2 months). On price, ads and device support there is nothing between them.

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

Hydro Solar HP ships an update every 2 months, HydroCalc Basic every 11 days. The most recent releases landed on October 27, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Hydro Solar HP | HydroCalc Basic |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 11 days** |
| Size | 29 MB | 35 MB |
| Requires iOS | **12.2** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Aqua Solanor Inc](https://appshunter.io/developer/1631684916) | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) |

## What reviewers say

### Hydro Solar HP

[App page](https://appshunter.io/ios/app/hydro-solar-hp/id1631684914)

**Features:** macOS Compatibility

**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 |
| --- | --- | --- |
| Pro Pack | $5.99 | one-time |


## Frequently asked questions

### Is Hydro Solar HP free?

Hydro Solar HP 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 Hydro Solar HP or HydroCalc Basic have ads?

Neither Hydro Solar HP nor HydroCalc Basic shows ads.

### Which is updated more often, Hydro Solar HP or HydroCalc Basic?

Hydro Solar HP ships an update every 2 months, and HydroCalc Basic every 11 days. Most recently, Hydro Solar HP was updated on October 27, 2026 and HydroCalc Basic on October 29, 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.*