# A/C Pro vs ERG for iOS

The clearest difference is review sentiment: ERG for iOS at 100% against A/C Pro's 27%. ERG for iOS also leads on rating (4.8 vs 2.1). A/C Pro's advantage is ratings volume (293 vs 64). 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.

ERG for iOS holds the better App Store score, 4.8 against 2.1. Both are backed by a comparable volume of ratings — 293 and 64 respectively. Written reviews point the same way: 27% of A/C Pro's written reviews are positive against 100% of ERG for iOS's.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on September 19, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | A/C Pro | ERG for iOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.1 (293 ratings)](https://appshunter.io/ios/app/ac-pro/id1496953441/reviews) | **[4.8 (64 ratings)](https://appshunter.io/ios/app/erg-for-ios/id1597142669/reviews)** |
| Number of ratings | **293** | 64 |
| Positive reviews | 27.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Free | Free |
| Best chart rank | #203 | **#103** |
| Size | 192 MB | 27 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Energizer](https://appshunter.io/developer/1346066670) | [Pipeline and Hazardous Materials Safety Administration](https://appshunter.io/developer/954888820) |

## What reviewers say

### A/C Pro

[App page](https://appshunter.io/ios/app/ac-pro/id1496953441)

**Currently charting:** #203 Top Free · Reference (US App Store)

This app guides you through recharging your vehicle's air conditioning system with step-by-step instructions tailored to your specific car. It offers video tutorials, helps locate the low side pressure port, and provides essential vehicle specifications for a successful DIY recharge.

**Highlights:** Step-by-step vehicle-specific instructions, Bluetooth connectivity with Smartcharge™ gauge, Instructional videos, Low side port finder, A/C spec database, Troubleshooting guide

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

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Helpful step-by-step instructions
- 🚀 Effective at recharging AC
- 👍 Clear and informative videos

**What reviewers complain about**

- 🐛 App crashes or doesn't work
- 🐛 UPC code not recognized
- 🐛 Incorrect vehicle information
- 🔒 Requires too many permissions
- 🔒 Forced to create account

**Reported bugs**

- App crashes when trying to enter UPC code
- Vehicle information not loading properly
- Bluetooth connection issues

**Requested features**

- Option to bypass app and use analog gauge
- More comprehensive vehicle database
- Closed captions for instructional videos


### ERG for iOS

[App page](https://appshunter.io/ios/app/erg-for-ios/id1597142669)

**Currently charting:** #103 Top Free · Reference (US App Store)

This app provides first responders with quick access to critical information for hazardous materials transportation incidents. It features an indexed list of dangerous goods, including ID numbers, hazards, and safety precautions, aiding in effective response.

**Highlights:** Indexed list of dangerous goods, ID number lookup, General hazard information, Recommended safety precautions, Multi-language support (English, French, Spanish)

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

**In-app purchases:** none


## Frequently asked questions

### Is A/C Pro free?

A/C Pro is free to download, with no in-app purchases.

### Is ERG for iOS free?

ERG for iOS is free to download, with no in-app purchases.

### Which has better reviews, A/C Pro or ERG for iOS?

ERG for iOS is rated higher. A/C Pro averages 2.1 out of 5 from 293 ratings, while ERG for iOS averages 4.8 from 64 ratings.

### Do A/C Pro or ERG for iOS have ads?

Neither A/C Pro nor ERG for iOS shows ads.

### Which is updated more often, A/C Pro or ERG for iOS?

A/C Pro ships an update every 4 months, and ERG for iOS every 4 months. Most recently, A/C Pro was updated on September 19, 2026 and ERG for iOS on September 22, 2026.

### Which is more popular, A/C Pro or ERG for iOS?

A/C Pro currently peaks at #203 in the App Store charts, and ERG for iOS at #103. Chart position reflects recent download velocity rather than total install base.

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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.*