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Learn Morse by ear with Koch. Translator, chart, keyer, SOS & Wabun.
Learn Morse code by ear, one letter at a time. • Koch-method lessons: start with four letters, unlock the next at 90% accuracy • Morse code translator: text ⇄ Morse, play as sound, light flash or vibration, repeating SOS • Morse code chart: tap any letter to hear it • Sending practice: tap the key, dots and dashes are detected automatically • Daily challenge, streaks and weak-letter stats • Adjustable character speed (WPM), Farnsworth spacing and tone • Bonus: Japanese Wabun code
past month, based on 1 day
Downloads
Low confidence10
From install count ÷ months since release
In-app revenue
Low confidence$7
From downloads × revenue per download
Ads
$2
$1 – $4
Estimate, ads (benchmark-based, not calibrated per app)
Total
$9
In-app + ads
Google Play only. Downloads from daily Top free ranks (or the store's install count); in-app revenue from Top grossing ranks, calibrated on AppTweak's US estimates, or else from downloads; ads from public ad benchmarks. Not reported figures.