Comparison

OBD Home vs EPA 608 Certification Prep

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

Head to head
About

OBD Home

This application connects to your vehicle via Bluetooth to provide diagnostic and monitoring functions. It allows for fault code reading and clearing, performance testing, and travel analysis, offering a comprehensive view of your car's health and driving habits.

Highlights
  • Fault code reading and clearing
  • Instrument panel monitoring
  • Performance testing
  • Travel analysis
  • Bluetooth 4.0/5.0 support
  • High-speed data transmission
Features
Read full description

OBD Home support V011 series products. OBD Home is a car diagnostic and monitoring application,support English,Español,Русский,日本語,中文. Through phone, use Bluetooth to communicate with the vehicle terminal to complete fault diagnosis and driving assistance functions. It has automobile detection and analysis functions such as fault code reading and clearing, instrument panel, performance test, and travel analysis. It also supports high-speed data transmission and has the advantages of low power consumption and ultra-power saving. caution: 1. Support the adapter that runs through Bluetooth 4.0/5.0. 2. The parameters supported by each vehicle are different, which has nothing to do with OBD Home, but is related to the vehicle control unit. 3. OBD Home for V011.

About

EPA 608 Certification Prep

Features
Read full description

Need your EPA 608 certification to handle refrigerants on the job? Overwhelmed by Core, Type I, II, III, and Universal sections? EPA 608 Certification Prep gives you 150 practice questions with clear explanations and 40 CFR citations on most regulatory items — built so you can prepare for your certification exam with confidence. WHAT'S INCLUDED: Practice Mode - 150 multiple-choice questions across 21 subtopics, every answer paired with an explanation and, where applicable, a 40 CFR Part 82 citation. - Drill into Core, Type I, Type II, or Type III separately, or sweep across the whole bank. - Track your accuracy by category to find weak areas before the real test. Mock Exams - Timed mock exams for Core, Type I, Type II, and Type III. - Question grid + flag-for-review during the exam, just like the official testing format. - Diagnostic results with a section-by-section breakdown and pass/fail readout against the EPA cutoffs. Reference Library - Refrigerants: HFC / HCFC / HFO / blends with ASHRAE class, GWP, ODP, and replacement charts. - Regulations: 40 CFR Part 82 Subparts A through F, summarized with section anchors. - Recovery Equipment: high-pressure, low-pressure, and very-low-pressure machine requirements. - Leak Repair: trigger thresholds, repair timelines, verification testing. - Safety: PPE, refrigerant exposure limits, oxygen-deprivation and decomposition products. WHO IS IT FOR: - HVAC apprentices preparing for EPA 608 Certification - Working technicians refreshing for Universal upgrade or re-certification - Vocational students and trade-school attendees - Service managers brushing up on current regulation WHY TECHS LOVE IT: - Fully offline — works in basements, attics, equipment rooms, and job sites with no signal. - No ads, no tracking, no subscription traps. - Real CFR citations on every answer so you can verify the source. - One-time unlock for the full question bank, every mock exam, and the full reference library. - Clean UI designed for one-handed use on a phone in a service van. ONE-TIME UNLOCK: Unlock Full Certification Prep is a single $14.99 USD non-consumable in-app purchase. It unlocks all 150 questions, every mock exam, and the full reference library forever on your Apple ID. No recurring fees. Practice questions are modeled on the EPA 608 certification exam format and built around the public 40 CFR Part 82 regulations. This app is a study aid; certification is awarded by an EPA-approved test administrator. Download EPA 608 Certification Prep and put your study sessions in your pocket.

Screenshots

OBD Home4 screens
EPA 608 Certification Prep4 screens

Verdict

The call

The clearest difference is in-app purchases: OBD Home at none against EPA 608 Certification Prep's 1. OBD Home also leads on iOS requirement (13 vs 17.0). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. EPA 608 Certification Prep sells 1 one-off in-app purchase. OBD Home asks for nothing beyond the download.

UpkeepUpdate frequency

OBD Home ships an update every 3 weeks, EPA 608 Certification Prep every 2 weeks. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
OBD Home versus EPA 608 Certification Prep: the parameters behind the verdict, then further details
ParameterOBD HomeEPA 608 Certification Prep
PriceFreeFree
Rating2.9 (50 ratings) — better—
Positive reviews31.6% of reviews—
Number of ratings50 — better—
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS13 — better17.0
Further details — not scored
Size84 MB3 MB
Age rating4+4+
DeveloperShenzhen Chaoyue Technology Development Co.,LtdShanghai Sheyuan Network Technology Co., Ltd.

In-app purchases

None

OBD Home

No in-app purchases

1 purchases

EPA 608 Certification Prep

One-time1
  • Unlock Full Certification Prep$9.99

Questions

Is OBD Home free?
OBD Home is free to download, with no in-app purchases.
Is EPA 608 Certification Prep free?
EPA 608 Certification Prep is free to download, with in-app purchases available.
Do OBD Home or EPA 608 Certification Prep have ads?
Neither OBD Home nor EPA 608 Certification Prep shows ads.
Which is updated more often, OBD Home or EPA 608 Certification Prep?
OBD Home ships an update every 3 weeks, and EPA 608 Certification Prep every 2 weeks. Most recently, OBD Home was updated on October 24, 2026 and EPA 608 Certification Prep on October 31, 2026.

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