# HVAC Tools PT Chart vs HydroCalc

HVAC Tools PT Chart and HydroCalc 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. HVAC Tools PT Chart sells 3 in-app purchases, starting at $4.99 per month and HydroCalc sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

HVAC Tools PT Chart ships an update monthly, HydroCalc every 5 weeks. The most recent releases landed on November 9, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | HVAC Tools PT Chart | HydroCalc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 weeks |
| Size | 9 MB | 2 MB |
| Requires iOS | 18 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Karol Jaworski](https://appshunter.io/developer/1799974477) | [Piotr Kaminski](https://appshunter.io/developer/6799375980) |

## What reviewers say

### HVAC Tools PT Chart

[App page](https://appshunter.io/ios/app/hvac-tools-pt-chart-gauge/id6760602879)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gauge Pro | $4.99 | per month |
| Gauge Pro | $39.99 | per year |
| Gauge Pro | $39.99 | per year |


### HydroCalc

[App page](https://appshunter.io/ios/app/hydrocalc-heating-and-flow/id6801788464)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HydroCalc Pro | $3.99 | one-time |


## Frequently asked questions

### Is HVAC Tools PT Chart free?

HVAC Tools PT Chart is free to download, with in-app purchases available.

### Is HydroCalc free?

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

### Do HVAC Tools PT Chart or HydroCalc have ads?

Neither HVAC Tools PT Chart nor HydroCalc shows ads.

### Which is updated more often, HVAC Tools PT Chart or HydroCalc?

HVAC Tools PT Chart ships an update monthly, and HydroCalc every 5 weeks. Most recently, HVAC Tools PT Chart was updated on November 9, 2026 and HydroCalc on November 6, 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.*