Press Ctrl+Alt+T in any text box and a small translucent card appears next to your caret.
Type in your own language, see the translation instantly, then press Enter to insert it
into the box you were already using. No switching windows, no copy-paste.
Why doesn't it hook your keyboard? Most similar tools use a low-level keyboard hook to intercept typing, and that breaks Chinese, Japanese and Korean IME composition — IMEs need the real keystrokes to build characters. PopLingo instead uses the card itself as the input surface, so Zhuyin, Pinyin and others work normally.
Ctrl+Alt+T toggles it in any applicationPopLingo-win64.zipPopLingo.exe — a tray icon appearsCtrl+Alt+T → type → EnterFor the full key reference, see the guide.