Decode Morse live through your microphone.
MorseScope is an offline Morse toolkit for iPhone and iPad. Watch a signal become dots, dashes, and text automatically.
LIVE DECODING
• Finds and follows a stable carrier automatically.
• Estimates frequency, speed, dot duration, level, and confidence.
• Shows key state while assembling Morse and text.
• Premium Decoder Pro adds a rolling live time-frequency waterfall with a six-second view, bounded ten-second history, and carrier overlay.
DECODE RECORDINGS AND WRITTEN MORSE
Import WAV, MP3, M4A, or AAC. MorseScope normalizes audio, estimates carrier and timing, and chooses the clearest stereo channel. Play or scrub while following time-aligned characters, spot low-confidence results, or tap a character to seek. Decode the built-in sample with one tap, or translate written dots and dashes.
Premium Decoder Pro adds a scrollable recording spectrogram with playback cursor and tap-to-seek; manual carrier; exact 5–40 WPM lock; sensitivity; and a 60–300 Hz filter. Results enter an on-device Session Library without source audio or spectrogram data.
ENCODE AND SEND
Turn text into International Morse code, play an adjustable tone, copy symbols, or export WAV or M4A. Send short messages through screen light, haptics, or rear-flashlight pulses. Visible modes use a conservative speed and warning; non-audio output has a 60-second safety limit.
ADAPTIVE CW PRACTICE
Learn every letter and number with Koch groups, Farnsworth timing, daily drills, focused review, and saved progress. Build deterministic drills from chosen characters or your text, then climb automatic speed ladders with accuracy goals. Practice callsigns, joined prosigns, Q-codes, QSO drills, the adaptive CW key, and guided sending.
FREE TO LEARN. PREMIUM TO ADVANCE.
Free features include text encoding, written decoding, signal controls, beginner lessons, the complete Koch path, standard Receive scoring, Today’s Practice, one-off selected-character custom drills, the adaptive Send key, and Callsign Practice. Free audio use includes Encoder playback up to 60 seconds and live or file decoding up to 30 seconds.
MorseScope Premium unlocks:
• Longer Encoder playback and WAV/M4A export.
• Longer microphone and imported-file decoding.
• Decoder Pro recording spectrogram, live waterfall, manual carrier, exact WPM lock, sensitivity, and filter controls.
• Complete Session Library: reopen, correct, share, and export earlier results. The newest session remains free.
• Weak-character and confusion-pair coaching, response insights, detailed history, Guided Sending scores, deterministic signal conditions, and Prosign/Q-code/QSO drills.
• Saved Custom Practice presets, pasted-text and advanced content sources, weak-character weighting, and resumable WPM ladders.
Choose weekly auto-renewal or a one-time lifetime purchase; both unlock the same Premium features. The app shows localized prices.
FORMATS AND LIMITS
• WAV: uncompressed mono/stereo PCM; 8–32-bit integer or 32-bit float; 8–192 kHz.
• MP3: mono/stereo CBR or VBR.
• M4A/AAC: unprotected AAC-LC, HE-AAC, HE-AAC v2, and matching raw ADTS `.aac`; not protected audio or ALAC.
• Import limit: 10 minutes and 128 MB. Use a clear 300–2,000 Hz carrier.
• Encoder playback/export limit: 8 minutes. WAV is 48 kHz mono 16-bit PCM; M4A is 48 kHz mono AAC-LC.
These technical safety limits apply to both free and Premium use.
PRIVATE BY DESIGN
Core processing stays on your device. No account, analytics, or advertising SDK is used. Network access is only for App Store purchases and subscription management. Microphone audio remains in bounded memory and is discarded when listening stops. Audio and spectrogram data are not saved to the Session Library.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://whitewhalesoft.com/apps/moorsecodeaudiodecoder/privacy
Questions, suggestions, or feedback? Contact zhaoxiaojian@hotmail.com.
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