Gretio vs McElroy Operator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gretio
This app enables advanced vehicle diagnostics and service functions for General Motors vehicles using an OBDLINK MX+ device. It analyzes data points, looks up trouble codes, and performs service procedures like DPF regenerations.
- Advanced diagnostic functions
- Analyze thousands of data points
- Look up diagnostic trouble codes
- Perform advanced service functions
- Exclusive for General Motors vehicles
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Use Gretio with an OBDLINK MX+ to perform advanced diagnostic functions on your diesel, gas, electric, or hybrid vehicle. Analyze thousands of different data points at high speeds. Look up diagnostic trouble codes for all modules including the Engine Control Module, Chassis Control Module, Drive Motor Control Modules, Battery Energy Control modules, Body Control Module, Radio, and many more. Perform advanced service functions such as diesel particulate filter service regenerations, selective catalytic reduction tests, power relay tests, and even program some features. Gretio is an advanced tool made for the DIY market. All procedures must be used in accordance with the vehicle's service manual or other OEM approved literature. Gretio is made exclusively for General Motors vehicles. Additional models will be supported in the future.
McElroy Operator
This app provides certified operators with easy access to their professional profiles, including qualifications and certifications. It also allows viewing summaries of joint reports and features a QR code for logging into the McElroy Data Logger.
- Operator profile access
- View certifications
- Access joint report summaries
- QR code for Data Logger login
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This application allows McElroy-certified operators to easily access their profile. This includes operator qualifications and certifications. Summaries of joint reports can also be viewed. At the core of the app is a QR code that operators can use to log into their profiles when using the McElroy Data Logger.
Screenshots
Verdict
The clearest difference is rating: McElroy Operator at 5.0 against Gretio's 3.8. McElroy Operator also leads on in-app purchases (none vs 4) and update cadence (every 3 days vs fortnightly). Gretio's advantage is ratings volume (23 vs 1). On price, ads and device support 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. Gretio sells 4 in-app purchases, starting at $19.99 per year. McElroy Operator asks for nothing beyond the download.
McElroy Operator holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: Gretio has 23 ratings behind it against 1, so its average is the more settled of the two.
Gretio ships an update fortnightly, McElroy Operator every 3 days. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.
| Parameter | Gretio | McElroy Operator |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (23 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 72.2% of reviews | — |
| Number of ratings | 23 — better | 1 |
| Update frequency | Fortnightly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 41 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Surreal Development LLC | McElroy Manufacturing, Inc. |
Customer experience
Gretio
McElroy Operator
In-app purchases
Gretio
- Gretio All Access$19.991 Year
- Gretio RPO Pack 1$29.99
- Gretio RPO Pack 2$29.99
- RPO Pack 3$29.99
McElroy Operator
No in-app purchases
