# Refrigerant Selection Tool vs P

The clearest difference is iOS requirement: Refrigerant Selection Tool at 11.0 against P's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 12 months. Both last shipped on November 2, 2026.

## The numbers

| Metric | Refrigerant Selection Tool | P |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (52 ratings)](https://appshunter.io/ios/app/p-t-calculator/id1252176525/reviews)** |
| Number of ratings | — | **52** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | Every 12 months |
| Monetization | — | Free |
| Size | 108 MB | 6 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Honeywell International, Inc.](https://appshunter.io/developer/311222963) | [National Refrigerants Inc.](https://appshunter.io/developer/1252176524) |

## What reviewers say

### Refrigerant Selection Tool

[App page](https://appshunter.io/ios/app/refrigerant-selection-tool/id1076574665)

**In-app purchases:** none


### P

[App page](https://appshunter.io/ios/app/p-t-calculator/id1252176525)

This tool simplifies HVAC/R technician tasks by calculating pressure/temperature relationships, superheat, and subcool. It automatically adjusts for altitude and offers English/Metric units. Easily access favorite refrigerants and supplementary information.

**Highlights:** Pressure/Temperature calculation, Superheat/Subcool calculation, Automatic altitude correction, English/Metric units, Favorite refrigerants list, Refrigerant blend data

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

**In-app purchases:** none


## Frequently asked questions

### Is Refrigerant Selection Tool free?

Refrigerant Selection Tool is free to download, with no in-app purchases.

### Is P free?

P is free to download, with no in-app purchases.

### Do Refrigerant Selection Tool or P have ads?

Neither Refrigerant Selection Tool nor P shows ads.

### Which is updated more often, Refrigerant Selection Tool or P?

Refrigerant Selection Tool ships an update every 12 months, and P every 12 months. Most recently, Refrigerant Selection Tool was updated on November 2, 2026 and P on November 2, 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.*