About this app
500 original questions for Korea's Industrial Safety exam. Study the five written domains and practical-safety concepts with explanations, mock exams, on-device progress, study-time achievements, and optional Lock Quiz. The actual exam is delivered in Korean. This independent product is not affiliated with or endorsed by HRDKorea. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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 Sep 17, 2026 · 1:43 PM Free
Screenshots
