# Ref Tools vs Circuit Wiring Simulator

The clearest difference is in-app purchases: Ref Tools at none against Circuit Wiring Simulator's 5. Circuit Wiring Simulator's advantage is update cadence (every 8 days vs every 5 weeks) and iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Circuit Wiring Simulator sells 5 one-off in-app purchases. Ref Tools asks for nothing beyond the download.

Ref Tools ships an update every 5 weeks, Circuit Wiring Simulator every 8 days. The most recent releases landed on October 7, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Ref Tools | Circuit Wiring Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (52 ratings)](https://appshunter.io/ios/app/ref-tools/id472312541/reviews)** | — |
| Number of ratings | **52** | — |
| Positive reviews | 57.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 8 days** |
| Monetization | Free | — |
| Size | 98 MB | 46 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Danfoss A/S](https://appshunter.io/developer/423984644) | [沛洁 赖](https://appshunter.io/developer/1895142467) |

## 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


### Circuit Wiring Simulator

[App page](https://appshunter.io/ios/app/circuit-wiring-simulator/id6763458134)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 30-day VIP | $4.99 | one-time |
| 90-day VIP | $8.99 | one-time |
| One-year VIP | $15.90 | one-time |
| three-year VIP | $24.99 | one-time |
| Lifetime VIP | $34.99 | one-time |


## Frequently asked questions

### Is Ref Tools free?

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

### Is Circuit Wiring Simulator free?

Circuit Wiring Simulator is free to download, with in-app purchases available.

### Do Ref Tools or Circuit Wiring Simulator have ads?

Neither Ref Tools nor Circuit Wiring Simulator shows ads.

### Which is updated more often, Ref Tools or Circuit Wiring Simulator?

Ref Tools ships an update every 5 weeks, and Circuit Wiring Simulator every 8 days. Most recently, Ref Tools was updated on October 7, 2026 and Circuit Wiring Simulator on September 28, 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.*