# DOCFIX vs EPA 609 Certification Prep

The clearest difference is rating: EPA 609 Certification Prep at 5.0 against DOCFIX's 1.0. EPA 609 Certification Prep also leads on update cadence (every 2 weeks vs every 2 months) and ratings volume (3 vs 1). DOCFIX's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (13 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. DOCFIX sells 3 one-off in-app purchases and EPA 609 Certification Prep sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

EPA 609 Certification Prep holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

DOCFIX ships an update every 2 months, EPA 609 Certification Prep every 2 weeks. The most recent releases landed on September 27, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | DOCFIX | EPA 609 Certification Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/docfix-auto-repair-guide/id6742226234/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/epa-609-certification-prep/id6762544342/reviews)** |
| Number of ratings | 1 | **3** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 77 MB | 2 MB |
| Requires iOS | **13** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nam Nguyen Tien](https://appshunter.io/developer/1785840657) | [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858) |

## What reviewers say

### DOCFIX

[App page](https://appshunter.io/ios/app/docfix-auto-repair-guide/id6742226234)

Access comprehensive automotive repair manuals, wiring diagrams, and diagnostic procedures for a wide range of vehicles. Quickly find solutions for engine, electrical, and maintenance issues with step-by-step guides and expert recommendations.

**Highlights:** Comprehensive repair manuals, Wiring diagrams and schematics, Diagnostic trouble codes (DTCs) and fixes, Component location and specifications, Maintenance schedules and fluid capacities, Fast and accurate search, Regular updates

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DOCFIX 1 MONTH | $4.00 | one-time |
| DOCFIX 6 MONTHS | $20.00 | one-time |
| DOCFIX 12 MONTHS | $38.00 | one-time |


### EPA 609 Certification Prep

[App page](https://appshunter.io/ios/app/epa-609-certification-prep/id6762544342)

Prepare for your EPA Section 609 MVAC certification with focused practice questions, clear explanations, and an offline reference library. Master regulations, refrigerant identification, and safety protocols for the motor-vehicle air-conditioning exam.

**Highlights:** Practice mode with 50 multiple-choice questions, Explanations and citations for every answer, Mock exams mirroring the real certification test, Offline reference library for refrigerants and regulations, Diagnostic pass/fail analysis against EPA cutoff, One-time unlock for Pro content

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Full Certification Prep | $9.99 | one-time |


## Frequently asked questions

### Is DOCFIX free?

DOCFIX is free to download, with in-app purchases available.

### Is EPA 609 Certification Prep free?

EPA 609 Certification Prep is free to download, with in-app purchases available.

### Which has better reviews, DOCFIX or EPA 609 Certification Prep?

EPA 609 Certification Prep is rated higher. DOCFIX averages 1.0 out of 5 from 1 ratings, while EPA 609 Certification Prep averages 5.0 from 3 ratings.

### Do DOCFIX or EPA 609 Certification Prep have ads?

Neither DOCFIX nor EPA 609 Certification Prep shows ads.

### Which is updated more often, DOCFIX or EPA 609 Certification Prep?

DOCFIX ships an update every 2 months, and EPA 609 Certification Prep every 2 weeks. Most recently, DOCFIX was updated on September 27, 2026 and EPA 609 Certification Prep on October 7, 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.*