K-Switch

K-Switch is a keyboard layout corrector for Windows 10 and 11. It watches what you type and, when a word comes out as gibberish in the current layout, rewrites it in the correct one and leaves the layout on the language it corrected to, so the next word is already right. Backspace immediately after a replacement undoes it.

You can also convert on demand with a double-tap of Ctrl: it converts the selected text, or the last word you typed if nothing is selected. An optional mouse-wheel gesture (Ctrl+Alt+wheel) cycles a word through the languages and is off by default, so it never interferes with Ctrl+wheel zoom.

Decisions come from dictionaries rather than letter-frequency heuristics. Every word is looked up in the dictionaries of both languages, and when a string is a valid word in both layouts the tool leaves it alone instead of guessing. That makes it quiet on code, usernames and commands, where statistical switchers misfire most.

Words you convert manually twice are learned and applied automatically from then on. The user dictionary is stored locally in your %LOCALAPPDATA%\K-Switch folder and encrypted with DPAPI.

Password fields are excluded at the engine level, including web fields where the user has enabled "show password".

Privacy is verifiable rather than promised: the executable imports no networking DLLs, so there is no code path to send anything anywhere. There is no update check, no account and no telemetry.

Known limitation, documented rather than hidden: English and Hebrew share many strings that spell a real word in both layouts. In those cases K-Switch stays out of the way. English and Russian separate cleanly.

Free for personal use, forever. Companies buy a per-seat licence.