# HydroCalc Plus vs Pipe Sizer

The clearest difference is price: HydroCalc Plus at $3.99 against Pipe Sizer's $12.99. HydroCalc Plus also leads on update cadence (every 3 weeks vs every 17 months) and rating (5.0 vs 4.8). Pipe Sizer's advantage is in-app purchases (none vs 4) and ratings volume (10 vs 1). On review sentiment, ads, monetization model and device support there is nothing between them.

HydroCalc Plus costs $3.99 and Pipe Sizer $12.99 up front. HydroCalc Plus sells 4 one-off in-app purchases. Pipe Sizer asks for nothing beyond the download.

HydroCalc Plus holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Pipe Sizer has 10 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

HydroCalc Plus ships an update every 3 weeks, Pipe Sizer every 17 months. The most recent releases landed on August 31, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | HydroCalc Plus | Pipe Sizer |
| --- | --- | --- |
| Price | **$3.99** | $12.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hydrocalc-plus/id578807688/reviews)** | [4.8 (10 ratings)](https://appshunter.io/ios/app/pipe-sizer-water/id1316033381/reviews) |
| Number of ratings | 1 | **10** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 17 months |
| Monetization | Paid | Paid |
| Size | 34 MB | 2 MB |
| Requires iOS | **15.1** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) | [Pheinex, LLC](https://appshunter.io/developer/996932317) |

## What reviewers say

### HydroCalc Plus

[App page](https://appshunter.io/ios/app/hydrocalc-plus/id578807688)

A professional tool for hydraulic engineers to calculate pressure losses in piping systems. It supports US and SI units, offers an extensive pipe material and fittings database, and includes inverse calculations for design optimization.

**Highlights:** Friction head loss calculation (Hazen-Williams), US and SI unit support, Extensive pipe material library, Fittings and valves database, Inverse calculation mode, Real-time results (velocity, losses)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pump Power Calculator | $1.99 | one-time |
| System Curve Generator | $1.99 | one-time |
| Pipe Database | $1.99 | one-time |
| Industrial Fluids Pack | $2.99 | one-time |


### Pipe Sizer

[App page](https://appshunter.io/ios/app/pipe-sizer-water/id1316033381)

This app helps water piping system engineers and designers quickly and accurately design and analyze piping systems. It offers direct input for flow, friction, or velocity, with live calculation updates and support for various units and pipe materials.

**Highlights:** Quickly size new piping systems, Analyze existing piping systems, Direct input for flow, friction, or velocity, Live calculation updates, Supports SI and IP units, Works with steel, copper, and PVC pipes, Includes fluid data for water and glycols

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is HydroCalc Plus free?

HydroCalc Plus costs $3.99, and also offers in-app purchases.

### Is Pipe Sizer free?

Pipe Sizer costs $12.99, with no in-app purchases.

### Which has better reviews, HydroCalc Plus or Pipe Sizer?

HydroCalc Plus is rated higher. HydroCalc Plus averages 5.0 out of 5 from 1 ratings, while Pipe Sizer averages 4.8 from 10 ratings.

### Do HydroCalc Plus or Pipe Sizer have ads?

Neither HydroCalc Plus nor Pipe Sizer shows ads.

### Which is updated more often, HydroCalc Plus or Pipe Sizer?

HydroCalc Plus ships an update every 3 weeks, and Pipe Sizer every 17 months. Most recently, HydroCalc Plus was updated on August 31, 2026 and Pipe Sizer on September 20, 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.*