Overview
CW Letter Trainer builds direct sound-to-letter recognition. It deliberately avoids showing the Morse pattern before an answer, so the learner connects a sound rhythm with a letter instead of counting dots and dashes.
The first release trains the 26 Latin letters only. Numbers, punctuation, and prosigns are reserved for later courses.
How to use it
- Choose Practice for staged learning or Challenge for a scored run.
- Press Start. The speaker lights while one Morse character is playing.
- Answer by clicking the on-screen QWERTY keyboard or pressing A-Z on a physical keyboard.
- A correct key flashes green. A wrong key flashes red and the correct letter is shown before the next question.
- Adjust Tone Hz to a comfortable pitch; changing pitch does not change the Morse timing.
How it works
Practice contains ten fixed stages. Each stage adds a small group of letters and increases speed gradually. Scoring at least 17 correct answers in the latest 20 attempts unlocks the next stage.
Challenge contains 30 single-letter questions. The character pool, WPM, background noise, and weak adjacent CW interference increase in fixed steps. WebAudio synthesizes all tones locally through one gain and compression chain.
Challenge sessions use a short-lived signed token. The server recalculates the final score, but it does not permanently store the target sequence or individual answers.
Versions and archives
v1.0 introduced staged A-Z practice, QWERTY input, the 30-question challenge, progressive noise, and the leaderboard.
Version archive
When a retired release has a runnable snapshot, this list will link both its documentation and the archived tool. Earlier releases without a snapshot are explicitly marked documentation only.