About
The Morse Practice Set is a free browser tool for learning Morse code by tracing a signal tree. There is no account, no install and no paywall.
Most Morse trainers assume you already know the alphabet and drill you on speed. This one is built for the stage before that: you can see the whole code set as one branching diagram while you practise, so you can look up what you do not yet remember.
It covers international Morse code and the Japanese Wabun set, and the interface is available in nine languages. Timing follows ITU-R M.1677-1: a dot of one unit, a dash of three, with the gap before a character is committed deliberately widened so that a beginner has time to search the tree.
The source code is public on GitHub.