A/C Pro vs ERG for iOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
A/C Pro
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.
- Step-by-step vehicle-specific instructions
- Bluetooth connectivity with Smartcharge™ gauge
- Instructional videos
- Low side port finder
- A/C spec database
- Troubleshooting guide
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When the time comes to recharge your vehicle’s A/C, the A/C Pro® phone app is here to help you. Step by step instructions, specifically tailored to your vehicle, guide you through the process. From locating the low side pressure port to letting you know when the recharge is complete, the instructions are seamless and easy to follow. If you are using an A/C Pro® product with Smartcharge TM technology, the app will connect to the gauge via Bluetooth. The app then provides guided, adaptive, vehicle-specific instructions helping to eliminate guesswork. An integrated troubleshooting guide get back on track should the need arise. Don’t feel like reading instructions? Alternatively, the app also provides handy instructional videos that are also specific to your vehicle’s year, make and model to help guide you through the recharge process. Perhaps you just need help in locating the low side port. The app includes access to the low side port finder – a robust image database showing where low side ports reside for most vehicles. The App also provides access to the A/C spec database, which provides refrigerant and oil specifications and capacities by vehicle. And if you still need additional help using an A/C Pro® product, the app will connect you directly with our support team. Thank you for choosing A/C Pro for all of your Auto A/C needs.
ERG for iOS
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.
- Indexed list of dangerous goods
- ID number lookup
- General hazard information
- Recommended safety precautions
- Multi-language support (English, French, Spanish)
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PHMSA’s Emergency Response Guidebook (ERG) is the go-to resource for first responders during the initial phase of a dangerous goods or hazardous materials transportation incident. The ERG app is a valuable companion, based on the latest edition of the ERG, to help responders quickly access critical information at their fingertips. The app features an indexed list of dangerous goods, including their associated ID number, general hazards, and recommended safety precautions. In practical scenarios, such as responding to an overturned tractor trailer displaying a DOT hazmat placard, emergency responders can use the app to quickly identify the material associated with the placard and get guidance on how to respond effectively. Full versions available in English, French, and Spanish.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | A/C Pro | ERG for iOS |
|---|---|---|
| Price | Free | Free |
| Rating | 2.1 (293 ratings) | 4.8 (64 ratings) — better |
| Positive reviews | 27.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 293 — better | 64 |
| Update frequency | Every 4 months | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Best chart rank | #203 | #103 — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 192 MB | 27 MB |
| Age rating | 4+ | 12+ |
| Developer | Energizer | Pipeline and Hazardous Materials Safety Administration |
Customer experience
A/C Pro
ERG for iOS
Bugs and requests
A/C Pro
Reported bugs
3 issues- App crashes when trying to enter UPC code
- Vehicle information not loading properly
- Bluetooth connection issues
Requested features
3 requests- Option to bypass app and use analog gauge
- More comprehensive vehicle database
- Closed captions for instructional videos
ERG for iOS
Not enough reviews yet to summarise bugs or requests.
In-app purchases
A/C Pro
No in-app purchases
ERG for iOS
No in-app purchases







