Morse Trainer: KR+EN

English and Korean Morse code in one app. Visual pulses + pure-tone audio, smart 4-choice quiz, dictionary, translator. Fully offline, no sign-up, no in-app purchases.

Learn international Morse code in both English and Korean alphabets — one app, two character sets, two practice modes.

Most Morse trainers ship English-only. Korean Morse follows a separate 24-character set (14 consonants + 10 vowels), and is used by Korean amateur radio operators on CW (Continuous Wave). Morse Trainer teaches both side-by-side, so bilingual learners and Korean radio operators can practice the alphabet they actually need.

FOUR CATEGORIES • English: 26 letters (A–Z) • Korean: 24 characters (ㄱ–ㅎ consonants + ㅏ–ㅣ vowels) • Numbers: 10 digits (0–9) • Punctuation: 8 symbols ( . , ? ! / ( ) = )

TWO LEARNING MODES • Visual mode — animated dot/dash pulses. Watch the rhythm before you hear it. • Audio mode — pure-tone Morse playback (500–800 Hz, adjustable 5–30 WPM). The same sound used in amateur radio CW practice.

SMART QUIZ • 4-choice flashcards with instant color feedback (green = correct, red = wrong). • Spaced repetition (SM-2 lite algorithm) — frequently-missed characters resurface more often. • Configurable session length (10 / 20 / 50 / 100 questions per session).

DICTIONARY • Tap any category chip to filter (English / Korean / Numbers / Punctuation). • Search by letter or Morse pattern. • Tap to hear the sound and see the dot/dash visualization.

TRANSLATOR • Text → Morse: type or paste any string, get the encoded Morse line-by-line. • Morse → Text: decode incoming patterns to readable text.

STATISTICS • Track session accuracy, time per session, characters mastered. • Per-category progress so you can see which set needs more drilling.

APP PHILOSOPHY • 100% offline — no sign-up, no internet connection needed, no cloud account. • No in-app purchases, no subscriptions, no paywalls. • Korean + English UI, light + dark theme, system theme follow. • Adjustable speed (WPM) and tone frequency to match your hearing preference.

WHO IT'S FOR • Beginners learning Morse code for the first time • Amateur radio operators preparing for CW practice • Korean amateur radio licensees needing the Korean alphabet drill • Scouts working on signaling badges • Students and hobbyists curious about the original digital encoding

PRIVACY The app stores progress locally on your device. No personal data is collected, transmitted, or shared. An anonymous advertising identifier is used to serve banner ads; you can reset it or opt out via your device's settings.

CONTACT Feedback and feature requests: siwooeo@gmail.com