# HVAC Toolkit Ultimate vs HydroCalc Plus

The clearest difference is review sentiment: HydroCalc Plus at 100% against HVAC Toolkit Ultimate's 40%. HydroCalc Plus also leads on price ($3.99 vs $59.99) and rating (5.0 vs 3.0). HVAC Toolkit Ultimate's advantage is in-app purchases (none vs 4) and ratings volume (4 vs 1). On ads, monetization model and device support there is nothing between them.

HVAC Toolkit Ultimate costs $59.99 and HydroCalc Plus $3.99 up front. HydroCalc Plus sells 4 one-off in-app purchases. HVAC Toolkit Ultimate asks for nothing beyond the download.

HydroCalc Plus holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews point the same way: 40% of HVAC Toolkit Ultimate's written reviews are positive against 100% of HydroCalc Plus's.

HVAC Toolkit Ultimate ships an update every 6 months, HydroCalc Plus every 3 weeks. The most recent releases landed on August 27, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | HVAC Toolkit Ultimate | HydroCalc Plus |
| --- | --- | --- |
| Price | $59.99 | **$3.99** |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/hvac-toolkit-ultimate/id391408247/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hydrocalc-plus/id578807688/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 40.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Paid | Paid |
| Size | 59 MB | 34 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) |

## What reviewers say

### HVAC Toolkit Ultimate

[App page](https://appshunter.io/ios/app/hvac-toolkit-ultimate/id391408247)

This comprehensive application offers a suite of tools for HVAC professionals, including load calculations, equipment tracking, refrigerant charts, duct and pipe sizing, and psychrometric analysis. It consolidates multiple functionalities into a single, powerful utility for field and office use.

**Highlights:** Residential load calculations, Equipment nameplate data tracking, Refrigerant pressure-temperature charts, Superheat and subcool calculations, Duct and pipe sizing analysis, Psychrometric calculations, Steam table property calculations

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is HVAC Toolkit Ultimate free?

HVAC Toolkit Ultimate costs $59.99, with no in-app purchases.

### Is HydroCalc Plus free?

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

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

HydroCalc Plus is rated higher. HVAC Toolkit Ultimate averages 3.0 out of 5 from 4 ratings, while HydroCalc Plus averages 5.0 from 1 ratings.

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

Neither HVAC Toolkit Ultimate nor HydroCalc Plus shows ads.

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

HVAC Toolkit Ultimate ships an update every 6 months, and HydroCalc Plus every 3 weeks. Most recently, HVAC Toolkit Ultimate was updated on August 27, 2026 and HydroCalc Plus on August 31, 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.*