🌐 Web app (any device — phone or computer)

Works instantly in your browser, and you can install it to your home screen / desktop so it opens like an app.

1. Open 121caclasses.com and log in.
2. To install it, tap Install below — it detects your device and guides you.

🍎 Mac app (download classes & watch offline)

1. Click Download for Mac below.
2. Open the downloaded .dmg file (in your Downloads).
3. Drag 121 CA Classes into your Applications folder.
4. Open it from Applications — it launches straight away (no warning).
5. Sign in with your normal account, then download any class to watch offline.

🪟 Windows app (download classes & watch offline)

1. Click Download for Windows below.
2. Open the downloaded .exe installer.
3. If Windows shows “Windows protected your PC”, click More info → Run anyway. (The app is safe — this notice just appears until our Windows certificate is finalised.)
4. It installs and opens. Sign in, then download any class to watch offline.

📱 iPhone

1. Open 121caclasses.com in Safari.
2. Tap the Share button (square with an up-arrow).
3. Tap Add to Home Screen → Add.

🤖 Android

1. Open 121caclasses.com in Chrome.
2. Tap the ⋮ menu → Install app (or “Add to Home screen”).