# HydroCalc Plus vs HVAC Toolkit Lite

The clearest difference is price: HVAC Toolkit Lite at Free against HydroCalc Plus's $3.99. HVAC Toolkit Lite also leads on in-app purchases (none vs 4) and iOS requirement (12.0 vs 15.1). On rating, ratings volume, update cadence and ads there is nothing between them.

HVAC Toolkit Lite is free to download; HydroCalc Plus costs $3.99 up front. HydroCalc Plus sells 4 one-off in-app purchases. HVAC Toolkit Lite asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for HydroCalc Plus against 5.0 for HVAC Toolkit Lite. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

HydroCalc Plus ships an update every 3 weeks, HVAC Toolkit Lite every 11 days. The most recent releases landed on October 4, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | HydroCalc Plus | HVAC Toolkit Lite |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/hydrocalc-plus/id578807688/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/hvac-toolkit-lite/id1628371325/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 11 days** |
| Monetization | Paid | **Free** |
| Size | 34 MB | 61 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) | [Mohamad Jaber](https://appshunter.io/developer/1623246777) |

## 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 |


### HVAC Toolkit Lite

[App page](https://appshunter.io/ios/app/hvac-toolkit-lite/id1628371325)

This tool assists HVAC engineers with design checks and quick calculations. It offers various tools for ducting friction loss, pipe sizing, ventilation, and heat load estimations, providing instructions and formulas for each calculation.

**Highlights:** Friction loss calculation, Pipe sizing, Ventilation calculations, Heat load estimation, Pump head calculation, Fan ESP calculation, Metric/Imperial units, English/Arabic language support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HydroCalc Plus free?

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

### Is HVAC Toolkit Lite free?

HVAC Toolkit Lite is free to download, with no in-app purchases.

### Which has better reviews, HydroCalc Plus or HVAC Toolkit Lite?

HydroCalc Plus and HVAC Toolkit Lite are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do HydroCalc Plus or HVAC Toolkit Lite have ads?

Neither HydroCalc Plus nor HVAC Toolkit Lite shows ads.

### Which is updated more often, HydroCalc Plus or HVAC Toolkit Lite?

HydroCalc Plus ships an update every 3 weeks, and HVAC Toolkit Lite every 11 days. Most recently, HydroCalc Plus was updated on October 4, 2026 and HVAC Toolkit Lite on September 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*