# HydroCalc Basic vs PipeDN

HydroCalc Basic and PipeDN are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. HydroCalc Basic sells 1 one-off in-app purchase and PipeDN sells 3 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

HydroCalc Basic ships an update every 11 days, PipeDN every 3 weeks. The most recent releases landed on October 4, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | HydroCalc Basic | PipeDN |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 3 weeks |
| Size | 35 MB | 40 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) | [AQUILES DE LIMA](https://appshunter.io/developer/1883397199) |

## What reviewers say

### 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 |


### PipeDN

[App page](https://appshunter.io/ios/app/pipedn/id6760237428)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PipeDN Pro | $7.99 | per month |
| PipeDN Pro | $49.99 | per year |
| PipeDN Pro | $79.99 | one-time |


## Frequently asked questions

### Is HydroCalc Basic free?

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

### Is PipeDN free?

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

### Do HydroCalc Basic or PipeDN have ads?

Neither HydroCalc Basic nor PipeDN shows ads.

### Which is updated more often, HydroCalc Basic or PipeDN?

HydroCalc Basic ships an update every 11 days, and PipeDN every 3 weeks. Most recently, HydroCalc Basic was updated on October 4, 2026 and PipeDN on September 18, 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.*