608 Practice Downloads & Revenue608 Practice · App Store
608 Practice is #14 in Education Paid in United States and charting in 1 of 30 countries we track.
Updated 8 Nov 2026 · rankings refresh through the day
DeveloperAfter Hours Data Systems LLC
CategoryEducation
Price12.99 USD
Released
Rating★ 3.9 (120)
Version2026.10.31
Age rating4+
First seen by us
24 Sep 2026
24 Sep 2026✏️New iPad screenshots✏️New screenshots📦Updated to version 2026.10.31📦Updated to version 2026.10.28📈New best rank in the overall chart: #100📈Entered the top 100🆕First spotted by AppInsider🆕Released on the App Store
Full timeline · 14 events
- ✏️608 Practice added 1 language+ ES
- ✏️608 Practice: new iPad screenshots· US
- ✏️608 Practice: new screenshots10 screenshots (was 10) · US
- 📦608 Practice updated to version 2026.10.31• Each section now says where you stand: Getting started, Not ready yet, Almost ready or Ready to pass
• Ready to pass means passing your last two mock exams, the closest thing to the real exam
• Each section and every mock exam result says what to do next
• 58 new questions and over 100 corrections, labelled New or Updated until you've seen them
• Weekly reminders stay on the day you chose
• About is now Settings, behind the gear icon… more - ✏️608 Practice: app got smaller30 MB → 26 MB (-13%)
- ✏️608 Practice: needs a newer iOSiOS 13.0 → iOS 15.0
- ✏️608 Practice: new iPad screenshots· US
- ✏️608 Practice: new screenshots10 screenshots (was 10) · US
- 📦608 Practice updated to version 2026.10.28• Readiness is now your predicted score on each section's exam, with a line marking the 72% pass mark
• The home screen lists the sections you're ready to pass
• Each section shows questions practiced and mastered
• Your progress is rescored on your device, so most figures go up
• The streak no longer runs off the screen at large text sizes
• Section totals update as soon as new questions arrive… more - 📈608 Practice new best rank in the overall chart: #100Top Paid · All Apps · US
- 📈608 Practice entered the top 100Top Paid · All Apps · US
- 🆕608 Practice first spotted by AppInsider#10 in Top Paid · Education · United States
- 📦608 Practice version 65No release notes
- 🆕608 Practice released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
3.9 ★
120 ratings
Measured
Best rank now
#14
Education PaidMeasured
608 Practice on the App Store
App details
App ID
1422450628
Publisher
After Hours Data Systems LLC
On the store since
Aug 2018
8 years on the store
Minimum OS
iOS 15.0+
iPhone 6s and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
2
EN ES
Size
25 MB
Where 608 Practice's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| United States | EducationPaid | #14 |
Apps near 608 Practice on the chart
Education Paid, around #14.
Ratings
App Store, worldwide.
Rating
3.9 ★
120 ratings
Measured
Ratings
120
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
under 1
4-week average
Lifetime rating
3.9★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
20/100
faster than 0% of Education apps
Review momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
What users say about 608 Practice
From the 50 most recent App Store reviews in the US.
Users frequently praise the app for containing questions that closely match the actual EPA 608 exam, helping many pass on their first attempt. However, there is significant frustration regarding recent updates that increased question volume without improving relevance, alongside persistent bugs like screen rotation crashes and incorrect answer keys.
Mixed but leaning positive (66% of recent reviews give 4–5 stars). People like it for being useful, and good value. The main complaints are about crashes and bugs, and price and subscriptions.
What people like
- Useful: “This app was extremely helpful”
- Price & subscription: “Best money ever spent on app”
- Features & content: “Great Practice Tests and study options!”
- Updates: “Would definitely like it updated to follow more in line with actual wording and add some questions that weren’t on the modern test”
Common complaints
- Crashes & bugs: “Good questions but the app is filled with bugs”
- Price & subscription: “Yet they still want to charge you ten dollars”
About 608 Practice
Prepare for your Section 608 certification exam with the most comprehensive study app available. Whether you're going for Type I, Type II, Type III, or Universal certification, 608 Practice has everything you need to pass.
Hundreds of Practice Questions Study from a massive question bank covering all four exam sections: Core, Type I, Type II, and Type III. Every question has four answer options and a detailed explanation, just like the real exam. New questions are added regularly.
Pressure-Temperature Chart Questions Practice reading PT charts the way you will on the real exam. An interactive chart covering R-22, R-134a, R-410A, R-404A, and R-32 is built right into the questions. Calculate superheat, subcooling, identify refrigerants, and compare pressures across different refrigerants.
5 Study Modes Per Section
Cram Mode - Read through every question with the correct answer and explanation shown. Absorb the material before testing yourself.
Study - Answer questions at your own pace with instant feedback. Your position is saved so you can pick up where you left off.
Smart Practice - The app tracks what you get wrong and builds focused sessions around your weak spots. 75% of questions come from your weakest areas, 25% from material you haven't seen yet. Questions you master (3 correct in a row) are excluded so you spend time where it matters.
Mock Exam - Simulate the real exam with 25 random questions. 72% required to pass, just like the actual certification test. Review your answers with full explanations after each attempt.
Most Missed - See which questions you get wrong most often, organized by section. As you master questions, they leave the list automatically.
Track Your Progress
Study streak counter to keep you motivated
Per-section readiness scores
Mastery tracking for every question (3 correct answers in a row = mastered)
Best test scores by section
Full history of practice and test results
Study Reminders Set daily or weekly notifications to keep your study habit consistent. Choose your preferred time and frequency.
Works Offline All questions are stored on your device. Study anywhere, anytime, with no internet required. Questions sync automatically in the background when updates are available.
Built for the Real Exam
72% passing score, matching the actual Section 608 exam
25 questions per test, same as the certification
Four answer options per question, just like the real thing
Covers all current regulations including the AIM Act and 2026 rule changes
Privacy First No account required. No personal data collected. All your progress stays on your device.
Hundreds of Practice Questions Study from a massive question bank covering all four exam sections: Core, Type I, Type II, and Type III. Every question has four answer options and a detailed explanation, just like the real exam. New questions are added regularly.
Pressure-Temperature Chart Questions Practice reading PT charts the way you will on the real exam. An interactive chart covering R-22, R-134a, R-410A, R-404A, and R-32 is built right into the questions. Calculate superheat, subcooling, identify refrigerants, and compare pressures across different refrigerants.
5 Study Modes Per Section
Cram Mode - Read through every question with the correct answer and explanation shown. Absorb the material before testing yourself.
Study - Answer questions at your own pace with instant feedback. Your position is saved so you can pick up where you left off.
Smart Practice - The app tracks what you get wrong and builds focused sessions around your weak spots. 75% of questions come from your weakest areas, 25% from material you haven't seen yet. Questions you master (3 correct in a row) are excluded so you spend time where it matters.
Mock Exam - Simulate the real exam with 25 random questions. 72% required to pass, just like the actual certification test. Review your answers with full explanations after each attempt.
Most Missed - See which questions you get wrong most often, organized by section. As you master questions, they leave the list automatically.
Track Your Progress
Study streak counter to keep you motivated
Per-section readiness scores
Mastery tracking for every question (3 correct answers in a row = mastered)
Best test scores by section
Full history of practice and test results
Study Reminders Set daily or weekly notifications to keep your study habit consistent. Choose your preferred time and frequency.
Works Offline All questions are stored on your device. Study anywhere, anytime, with no internet required. Questions sync automatically in the background when updates are available.
Built for the Real Exam
72% passing score, matching the actual Section 608 exam
25 questions per test, same as the certification
Four answer options per question, just like the real thing
Covers all current regulations including the AIM Act and 2026 rule changes
Privacy First No account required. No personal data collected. All your progress stays on your device.
Latest updates
2026.10.31
• Each section now says where you stand: Getting started, Not ready yet, Almost ready or Ready to pass
• Ready to pass means passing your last two mock exams, the closest thing to the real exam
• Each section and every mock exam result says what to do next
• 58 new questions and over 100 corrections, labelled New or Updated until you've seen them
• Weekly reminders stay on the day you chose
• About is now Settings, behind the gear icon
2026.10.28
• Readiness is now your predicted score on each section's exam, with a line marking the 72% pass mark
• The home screen lists the sections you're ready to pass
• Each section shows questions practiced and mastered
• Your progress is rescored on your device, so most figures go up
• The streak no longer runs off the screen at large text sizes
• Section totals update as soon as new questions arrive
65
Store changes
What 608 Practice changed on its store page: name, icon, screenshots, price, size, languages, requirements.
Added 1 language
+ ES
New iPad screenshots
New screenshots
10 screenshots (was 10)
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