# Ref Tools vs Pipe Flow Gas Pressure Drop

The clearest difference is rating: Pipe Flow Gas Pressure Drop at 4.8 against Ref Tools's 3.9. Pipe Flow Gas Pressure Drop also leads on update cadence (fortnightly vs every 5 weeks) and iOS requirement (11.0 vs 15.0). Ref Tools's advantage is in-app purchases (none vs 1) and ratings volume (52 vs 13). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Pipe Flow Gas Pressure Drop sells 1 one-off in-app purchase. Ref Tools asks for nothing beyond the download.

Pipe Flow Gas Pressure Drop holds the better App Store score, 4.8 against 3.9. Both are backed by a comparable volume of ratings — 52 and 13 respectively.

Ref Tools ships an update every 5 weeks, Pipe Flow Gas Pressure Drop fortnightly. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Ref Tools | Pipe Flow Gas Pressure Drop |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (52 ratings)](https://appshunter.io/ios/app/ref-tools/id472312541/reviews) | **[4.8 (13 ratings)](https://appshunter.io/ios/app/pipe-flow-gas-pressure-drop/id1582666236/reviews)** |
| Number of ratings | **52** | 13 |
| Positive reviews | 57.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | Free | Free |
| Size | 98 MB | 67 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Danfoss A/S](https://appshunter.io/developer/423984644) | [Pipe Flow Software](https://appshunter.io/developer/1193064957) |

## What reviewers say

### Ref Tools

[App page](https://appshunter.io/ios/app/ref-tools/id472312541)

This app provides HVACR technicians with essential tools and information for field service. It includes refrigerant calculators, troubleshooting guides, product finders, and access to spare parts. Listen to educational podcasts to enhance your knowledge on the go.

**Highlights:** Refrigerant Slider for P/T calculations, Solenoid valve coil testing tool, Refrigeration system troubleshooting guide, Product data finder, Spare parts ordering, Low-GWP refrigerant comparison, TXV Superheat optimization, Educational podcasts

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

**In-app purchases:** none

**What reviewers like**

- 👍 Useful tool for HVAC/R techs
- 👍 Great idea for an app
- 👍 Best refrigeration and hvac app
- 👍 Useful App for HVACR
- 👍 Brilliant app

**What reviewers complain about**

- 🐛 Crashes instantly on launch
- 🐛 App won’t open on iPhone
- 🐛 Flashes up and disappears
- 🐛 Cannot open app
- 🐛 Immediately shuts off

**Reported bugs**

- CRASHED instantly on Mac Mini M4
- App won’t open on iPhone
- App flashes up and disappears
- Cannot open app
- Immediately shuts off since recent release

**Requested features**

- More residential AC information
- Troubleshooter for Residential & Commercial
- Add SP22 refrigerant
- Add R-11 refrigerant
- Add R-123 range down to 40 degrees


### Pipe Flow Gas Pressure Drop

[App page](https://appshunter.io/ios/app/pipe-flow-gas-pressure-drop/id1582666236)

This app calculates gas pressure loss in pipes using various compressible flow equations. It automatically handles gas density changes and provides detailed results including Reynolds number and friction factors. Users can customize pipe materials, fittings, and gases from integrated or custom databases.

**Highlights:** Friction and fitting loss calculations, Multiple compressible flow equations, Automatic gas density handling, Customizable pipe, fitting, and gas data, Imperial and Metric unit support, Professional Excel and PDF reports, Results verification against published data

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pipe Flow Gas Pressure Drop | $4.99 | one-time |


## Frequently asked questions

### Is Ref Tools free?

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

### Is Pipe Flow Gas Pressure Drop free?

Pipe Flow Gas Pressure Drop is free to download, with in-app purchases available.

### Which has better reviews, Ref Tools or Pipe Flow Gas Pressure Drop?

Pipe Flow Gas Pressure Drop is rated higher. Ref Tools averages 3.9 out of 5 from 52 ratings, while Pipe Flow Gas Pressure Drop averages 4.8 from 13 ratings.

### Do Ref Tools or Pipe Flow Gas Pressure Drop have ads?

Neither Ref Tools nor Pipe Flow Gas Pressure Drop shows ads.

### Which is updated more often, Ref Tools or Pipe Flow Gas Pressure Drop?

Ref Tools ships an update every 5 weeks, and Pipe Flow Gas Pressure Drop fortnightly. Most recently, Ref Tools was updated on October 7, 2026 and Pipe Flow Gas Pressure Drop on October 9, 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.*