# BITZER REFRIGERANT RULER vs WOLF Service App

The clearest difference is update cadence: WOLF Service App at every 3 weeks against BITZER REFRIGERANT RULER's every 4 months. On price, review sentiment, 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.

BITZER REFRIGERANT RULER ships an update every 4 months, WOLF Service App every 3 weeks. Both last shipped on September 22, 2026.

## The numbers

| Metric | BITZER REFRIGERANT RULER | WOLF Service App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (1.1K ratings)](https://appshunter.io/ios/app/bitzer-refrigerant-ruler/id373683792/reviews)** | — |
| Number of ratings | **1.1K** | — |
| Positive reviews | 63.6% of reviews | **65.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 21 MB | 206 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [BITZER SE](https://appshunter.io/developer/1224090796) | [Wolf GmbH / www.wolf.eu](https://appshunter.io/developer/1253866201) |

## What reviewers say

### BITZER REFRIGERANT RULER

[App page](https://appshunter.io/ios/app/bitzer-refrigerant-ruler/id373683792)

This tool quickly determines refrigerant data, including properties, safety groups, GWP, and ODP. It offers intuitive temperature-to-pressure conversion and supports both metric and imperial units. Access detailed information and links to online resources for over 100 refrigerants.

**Highlights:** Refrigerant data lookup, Temperature-to-pressure conversion, Metric and imperial unit support, Over 100 refrigerants, Oil type information, GWP and ODP data, Search filters and favorites

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

**In-app purchases:** none

**What reviewers like**

- 👍 Comprehensive refrigerant list
- 🚀 Efficient and easy to use
- 💡 Helpful for HVAC students and professionals

**What reviewers complain about**

- 🐛 Accuracy issues with some refrigerants
- 🔧 Confusing layout and navigation after recent update
- 🔋 Crashes or freezes on some devices

**Reported bugs**

- Incorrect pressure-temperature relationships
- Inconsistent units (PSIA vs PSIG)

**Requested features**

- Altitude adjustment option
- Ability to filter or hide unwanted refrigerants
- Addition of more refrigerant trade names


### WOLF Service App

[App page](https://appshunter.io/ios/app/wolf-service-app/id504858287)

This app provides heating technicians with a digital catalog of over 6800 spare parts, complete with photos and exploded views. It also features an error code inspector to quickly diagnose and troubleshoot heating system issues.

**Highlights:** Digital spare parts catalog, Over 6800 spare parts, 4600+ associated photos, 950+ clickable exploded views, Direct email ordering of parts, Error code inspector, Quick troubleshooting manual

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

**In-app purchases:** none


## Frequently asked questions

### Is BITZER REFRIGERANT RULER free?

BITZER REFRIGERANT RULER is free to download, with no in-app purchases.

### Is WOLF Service App free?

WOLF Service App is free to download, with no in-app purchases.

### Do BITZER REFRIGERANT RULER or WOLF Service App have ads?

Neither BITZER REFRIGERANT RULER nor WOLF Service App shows ads.

### Which is updated more often, BITZER REFRIGERANT RULER or WOLF Service App?

BITZER REFRIGERANT RULER ships an update every 4 months, and WOLF Service App every 3 weeks. Most recently, BITZER REFRIGERANT RULER was updated on September 22, 2026 and WOLF Service App on September 22, 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.*