Last updated: 2026-09-15 · Developer: NKKTech Global (NKKTECH GLOBAL PTE. LTD., 18 Sin Ming Lane, #07-13 Midview City, Singapore 573960)
This page applies to the following app, published under the developer name NKKTech Global by NKKTECH GLOBAL PTE. LTD. ("NKKTech", "we"):
Google Play: Math Physics Chemistry Formula (package com.nkktech.cong_thuc)
Apple App Store: Công Thức Toán Lý Hóa 12 (bundle com.nkktech.global.congthuc)
Name shown inside the app: Công Thức Toán Lý Hóa
Contact us
Email support@nkktech.com. Please include your device model, operating-system version, the app version and what you were doing when the problem happened. We usually reply within 2 business days.
Frequently asked questions
Do I need an account? Where is my data?
No account is needed. Everything you enter is stored only on your device and the app works offline. Uninstalling the app deletes that data.
Why do I see ads?
Ads (Google AdMob) keep the app free. On iOS you can decline tracking in the App Tracking Transparency prompt and still use every feature; you can also reset or limit the advertising ID in your device settings.
Reminders or notifications do not show up.
Check that the reminder is turned on in the app and that notifications are allowed for the app in your device Settings. On Android, also turn off battery optimization for the app; reminders may arrive a few minutes late.