Everything in the app
- 1,100 exam-style EPA 608 practice questions: Core 300, Type I 250, Type II 300, Type III 250
- Study plan by exam date: daily new questions and retries, full practice exams at the end
- Study by topic, Smart Practice, Cram mode and saved questions
- Mock exams in the real format: 25 questions per section, 70% to pass, optional timer
- Universal mock: 100 questions, each section scored on its own
- Mistake review: missed questions return until you get them right
- Readiness: an estimated mock score per section, from your own answers
- Stats per section: seen, mastered, weak topics, mock results
- Pressure-temperature chart for 11 refrigerants, from R-410A to low-pressure R-123
- 12 summary cards with diagrams, from the refrigeration cycle to A2L refrigerants
- Numbers to remember, a glossary of 45 defined terms, and search
- What changed in 2026, and a step-by-step guide to getting certified
- Dark theme and an optional daily reminder
Four things we hold to
Built for the 2026 rules.
Since January 1, 2026, the AIM Act leak-repair rule covers appliances with 15 lb or more of HFC refrigerant, with leak-rate triggers of 10, 20 and 30 percent. Residential and light commercial air conditioners and heat pumps are excluded. Questions on these changes carry a 2026 badge.
Every answer names its source.
Tap a regulation source to read the exact eCFR paragraph it cites, stored in the app (eCFR as of September 18, 2026), so you can check the answer yourself, even offline.
Try before you pay.
Study free, then pick a weekly or monthly plan. No trial that turns into a charge, no accounts, no ads.
100% offline.
Study in the truck, in the shop, in the mechanical room. Nothing to sign into, nothing to sync.
What it looks like
Four sections, 1,100 questions
| Core: | ozone depletion, the Clean Air Act and Montreal Protocol, refrigerant classes and A2L safety groups, recovery, recycling and reclamation, the sales restriction, cylinder safety and shipping, and the 2026 leak-repair rules. |
|---|---|
| Type I (Type 1): | small appliances and their recovery requirements. |
| Type II (Type 2): | medium-, high- and very high-pressure appliances, leak detection and repair under both rulebooks, evacuation levels, superheat and subcooling. |
| Type III (Type 3): | low-pressure appliances such as chillers, recovery and evacuation levels, leak testing and repair. |
Questions people ask
Is the app free?
Free to start. In the Free tab you can try every study mode on sample questions, and you get 10 free questions a day from a set of 50, plus one free Core mock exam. What changed in 2026, the certification guide and two examples each from the summary cards, the pressure-temperature chart, numbers to remember and the glossary are free too. A weekly or monthly plan unlocks all 1,100 questions, every study mode, unlimited mock exams including the Universal mock, the full pressure-temperature chart, all 12 summary cards, the study plan and stats. Plans renew automatically until you cancel in Google Play.
How do the plans work?
Full access is a weekly or monthly plan bought through Google Play. It renews automatically until you cancel, and you can cancel at any time in Google Play under Subscriptions. After you cancel, full access stays until the end of the period you paid for. Your progress stays on your phone either way.
How does the study plan work?
Set your exam date and the app works out how many new questions a day it takes to see every question before the exam. Questions you miss come back as retries, up to 10 a day, and the last days before the exam, up to three, are full practice exams. If the days are too few, the plan tells you how far it reaches. The study plan is part of the weekly and monthly plans.
Does it work offline?
Yes. Everything runs on the device, including the regulation text behind the answers. There is no account and nothing to sync.
Do you collect any data?
The app itself collects nothing. There are no accounts, no analytics and no ads, your progress stays on your phone, and the optional daily reminder is scheduled on the phone itself. The only data that leaves the phone goes to Google, through Google Play's own features in the app: purchases, the optional rating prompt and update checks. The purchase service also sends Google technical logs, such as whether a request succeeded. The privacy policy has the details.
Does it cover the 2026 leak-repair rules?
Yes. Questions reflect the rules in force since January 1, 2026, and 2026 changes are marked with a badge in the app.
Which exam sections are covered?
Core, Type I, Type II and Type III: 1,100 questions in all (Core 300, Type I 250, Type II 300, Type III 250).
Is StudyRig affiliated with the EPA?
No. StudyRig is an independent publisher and is not affiliated with or endorsed by the U.S. EPA or any certification provider.
What's new
Version 1.3.0
- New: a study plan worked out from your exam date, with daily new questions, retries and full practice exams
- New: a readiness estimate for each section, from your own answers
- New Stats: seen, mastered, weak topics and mock results per section
- Mistakes: a question leaves the list when you answer it right
- Easier to read at large text sizes
- 24 questions reworded
Version 1.2.0
- Full access is now a weekly or monthly plan. Cancel anytime in Google Play
- The free questions, the free study samples and the free Core mock exam stay free
- Your progress stays on your phone
Version 1.1.2
- New: the app tells you when a new version is ready on Google Play. Tap Update, keep studying, and restart when it is done
- Privacy policy: a new section on what Google Play receives for purchases, ratings and update checks
Version 1.1.1
- New Free tab: try every study mode on sample questions
- Free sample: 10 questions a day from 50 free questions, the same 10 for 24 hours
- One free Core mock exam in the real format
- Today's plan now stays the same all day
- Readiness shows how many questions you have mastered
- PT chart in °C now has whole-degree rows
- Fixes for large text sizes and the launch screen
Version 1.1.0
- 1,100 questions across Core, Type I, Type II and Type III, each with its source
- Tap a regulation source to read the rule text, offline
- Pressure-temperature chart for 11 refrigerants
- 12 summary cards with diagrams, numbers to remember, a glossary and search
- Universal mock, optional timer, Cram, saved questions, and free questions in every Type section
- Dark theme and an optional daily reminder
- Progress carries over. Readiness counts questions answered right 3 times in a row
Version 1.0.1
- Official EPA and eCFR source links, the privacy policy and a Rate this app link on the About screen
- A confirmation before you leave a running mock exam
- Mastery progress on each question in mistake review
- An unlock banner on Home for free users
Version 1.0.0 · September 9, 2026
- First release on Google Play
Deeper reading
- EPA 608 leak repair rules in 2026: the 15-pound threshold and the 10/20/30% triggers (checked on September 11, 2026)
- How the EPA 608 exam works: sections, question counts, the 70 percent pass mark and the open-book rules (checked on September 11, 2026)
- A2L refrigerants and the EPA 608 exam: what the rules require, and what they do not (checked on September 14, 2026)
- How to get EPA 608 certified in 2026: the steps, in order (checked on September 14, 2026)
Where the answers come from
Key regulatory sources referenced throughout this app:
- U.S. EPA, Section 608 Technician Certification:
https://www.epa.gov/section608/section-608-technician-certification - 40 CFR Part 82, Protection of Stratospheric Ozone (eCFR):
https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-82 - 40 CFR Part 84, Phasedown of Hydrofluorocarbons, AIM Act rules (eCFR):
https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-84
This app is a study aid. For official certification requirements, always refer to the official U.S. EPA sources above.