About this app
Prepare thoroughly for your HVAC Certification with our comprehensive app. Features include: - Complete Q&A for all categories - Realistic exam mode simulations - Save and review your favorite questions - Track your visible progress - Marathon mode for intensive practice - Detailed error analysis for improvement - Completely ad-free experience
Latest release
What’s New
Hey there! - We've updated all questions — ready for 2026! - Added iOS 26 support We’ve also fixed some minor bugs, so if you encounter any issues, please let us know by clicking the "Support" button in the settings menu. Alternatively, you can reach us directly at nght.cdng@gmail.com. Thanks for using our app!
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 12, 2026 · 6:41 PM Free
Screenshots
