Ditty — learn Morse code by sending it

A free Morse code lab for children and grown-ups. Tap for a dit, hold for a dah — and every mark is drawn as long as you held it, so the rhythm that makes Morse readable is something you can see as well as hear.

What is inside

• Key — send with a straight key you hold, or two buttons that hand you the timing. Watch it on a paper tape, or switch to a signal lamp in a dark room.
• Quests — one character at a time in Koch order, scored on how closely your rhythm matches, with one to three stars.
• Explore — a playable alphabet where every key wears its own code, plus numbers and punctuation, real signals such as SOS and CQD, and the history of Morse from 1838 to today.
• Log — keep the messages you make and hear them again.
• Settings — Farnsworth timing: letters stay at real speed while the silence between them stretches, so there is room to think.

Free, installable, works offline, and available in English, 日本語 and 中文. No ads, no tracking, no accounts — everything stays on your device.

Sibling to Huely, a colour-mixing lab.