📈Last 7 days+2 installs — 100% faster than the week before (+1) · 0/day since Oct 7
🏆Among Education apps bottom 27% by installs gained this week (2011 peers growing)
🛠Updatesactively updated · updated 7 days ago · every ~20 days (2 updates tracked)
Installs since launch
+9 installs
since Oct 7
Update history
1.2.6Nov 5, 2026 · seen Nov 12, 2026
Added a note about Qualification Keyholder, which covers 60 qualifications in one app. Purchases in this app stay in this app.
1.2.3Oct 16, 2026 · seen Oct 22, 2026
Simplified the Settings screen; it now links to the privacy policy. Study records and purchases are unchanged.
First-Class Health Officer is an education app by Particles and Waves with 10+ downloads (about 21 estimated). +2 installs in the last 7 days. Released Aug 4, 2026. Install growth, rank history, SDKs and ad networks.
From the store listing: “Japanese-language practice: 300 questions, explanations for every choice.”
