ToggleNine

Toggle9 makes free online tools that show their working.

On this channel you'll see them in action: calculators, converters, checkers and printables for everyday problems. Work out compound interest, a loan or your take-home pay. Convert grams to cups for real ingredients. Check whether someone can send email pretending to be you. Learn the Korean alphabet stroke by stroke, or print coloring pages and times-table worksheets.

Every tool shows how it got its answer, lists the sources it relies on and says when it was last checked, so you can trust the result rather than take it on faith. Many run entirely in your browser, so what you type stays on your device.

New tools every week. Try them all free at https://toggle9.com