Comparison

Gretio vs MaxiAP Diag

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Gretio

This app allows advanced vehicle diagnostics and service functions for diesel, gas, electric, and hybrid cars. It analyzes thousands of data points, looks up trouble codes across all modules, and performs service regenerations and tests. Designed for DIY users, it requires specific hardware and vehicle compatibility.

Highlights
  • Advanced vehicle diagnostics
  • Analyze thousands of data points
  • Diagnostic trouble code lookup
  • Perform service functions (DPF regen, SCR tests)
  • Program vehicle features
  • Supports diesel, gas, electric, hybrid vehicles
Features
Read full description

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 approved literature by your vehicle manufacturer. Gretio only functions on certain makes and models. Visit our website at https://surrealdev.com/gretio/ to see a list of known supported vehicles.

About

MaxiAP Diag

This management app helps DIY vehicle owners with repairs, maintenance, and customization. It offers diagnostic insights, common dashboard light explanations, and service functions for various car models. Monitor your vehicle's health and access repair shop information.

Highlights
  • Enhanced system diagnostics
  • OBDII test (read/erase codes, live data)
  • Auto VIN vehicle identification
  • Vehicle health monitoring
  • DIY service functions (oil reset, TPMS)
  • EV/Hybrid battery testing
  • Common dashboard light guide
Features
Read full description

MaxiAP Diag is a management application designed to meet the simple repair, maintenance, and customization needs of DIY vehicle owners. As a next-generation DIY diagnostic tool, it is dedicated to providing C-end users with insights into vehicle conditions and diagnostic recommendations. Additionally, features such as common dashboard lights, Technical Service Bulletins (TSBs), and 100km acceleration test have been added based on personalized customer demands, further enhancing user understanding of the vehicle's condition. 1. Comprehensive support for enhanced system diagnostics of internationally recognized car models. 2. Provides OBDII test, including the ability to read and erase codes, emissions results, view freeze frame and live data. 3. Supports late model vehicles using faster CANFD communications. 4. Quick vehicle identification with Auto VIN. Store and quickly access past records, and diagnostic reports. 5. Complete monitoring of vehicle health, including engine oil life, average fuel consumption, and brake pad life. 6. Supports commonly performed DIY service functions, such as oil reset, TPMS relearn, battery registration, and wipers replacement. 7. Test hybrid and electric vehicle power battery. Assess battery State of Charge (SoC), State of Health (SoH), and recharge mileage. Provides battery maintenance reminders. 8. Provides additional features tailored to the needs of DIY users, such as Find a Local Repair Shop function and Common Dashboard Lights, etc.

Screenshots

Gretio4 screens
MaxiAP Diag4 screens

Verdict

The call

The clearest difference is review sentiment: Gretio at 68% against MaxiAP Diag's 0%. Gretio also leads on rating (3.8 vs 2.9) and update cadence (monthly vs every 5 months). MaxiAP Diag's advantage is iOS requirement (13.0 vs 18.0). On price, ratings volume, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Gretio sells 4 in-app purchases, starting at $19.99 per year and MaxiAP Diag sells 28 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Gretio holds the better App Store score, 3.8 against 2.9. Both are backed by a comparable volume of ratings — 23 and 10 respectively. Written reviews point the same way: 68% of Gretio's written reviews are positive against 0% of MaxiAP Diag's.

UpkeepUpdate frequency

Gretio ships an update monthly, MaxiAP Diag every 5 months. The most recent releases landed on October 29, 2026 and October 20, 2026 respectively.

Scorecard4 real differences · 6 level
Gretio versus MaxiAP Diag: the parameters behind the verdict, then further details
ParameterGretioMaxiAP Diag
PriceFreeFree
Rating3.8 (23 ratings) — better2.9 (10 ratings)
Positive reviews68.4% of reviews — better0.0% of reviews
Number of ratings23 — better10
Update frequencyMonthly — betterEvery 5 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.013.0 — better
Further details — not scored
Size40 MB104 MB
Age rating4+4+
DeveloperSurreal Development LLCAutel Intelligent Technology Co., Ltd.

Customer experience

Gretio

All ratings23 ratings
Positive69.6%
Neutral0.0%
Negative30.4%
Written reviews19 reviews
Positive68.4%
Neutral5.3%
Negative26.3%

MaxiAP Diag

All ratings10 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

4 purchases

Gretio

Subscriptions1
  • Gretio All Access$19.991 Year
One-time3
  • Gretio RPO Pack 1$34.99
  • Gretio RPO Pack 2$34.99
  • RPO Pack 3$34.99
28 purchases

MaxiAP Diag

One-time28
  • Mazda for one year$21.99
  • Mini for one year$21.99
  • INFINITI for one year$21.99
Show 25 more
  • Lamborghini for one year$21.99
  • Mitsubishi for one year$21.99
  • Cadillac for one year$21.99
  • Chrysler for one year$21.99
  • Scion for one year$21.99
  • Subaru for one year$21.99
  • GMC for one year$21.99
  • Buick for one year$21.99
  • Audi for one year$21.99
  • Acura for one year$21.99
  • Lexus for one year$21.99
  • Volkswagen for one year$21.99
  • Nissan for one year$21.99
  • Ford for one year$21.99
  • Honda for one year$21.99
  • BMW for one year$21.99
  • Chevrolet for one year$21.99
  • Dodge for one year$21.99
  • Hyundai for one year$21.99
  • Jeep for one year$21.99
  • Kia for one year$21.99
  • Mercedes-Benz for one year$21.99
  • Ram for one year$21.99
  • Toyota for one year$21.99
  • Volvo for one year$21.99

Questions

Is Gretio free?
Gretio is free to download, with in-app purchases available.
Is MaxiAP Diag free?
MaxiAP Diag is free to download, with in-app purchases available.
Which has better reviews, Gretio or MaxiAP Diag?
Gretio is rated higher. Gretio averages 3.8 out of 5 from 23 ratings, while MaxiAP Diag averages 2.9 from 10 ratings.
Do Gretio or MaxiAP Diag have ads?
Neither Gretio nor MaxiAP Diag shows ads.
Which is updated more often, Gretio or MaxiAP Diag?
Gretio ships an update monthly, and MaxiAP Diag every 5 months. Most recently, Gretio was updated on October 29, 2026 and MaxiAP Diag on October 20, 2026.

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