SoundBud: Chord & Key Finder

Musicians: decode any song into key, BPM and chords, then play it. Creators: master your audio and video for Spotify, TikTok and YouTube. No PC, AI guided.

Hear a song, decode it. Record or drop in a video, polish it. SoundBud is your pocket studio for sound, built for musicians, podcasters and content creators.

Record, upload, or send audio and video from any other app with the iOS share sheet. In seconds you get the key, BPM, chord progression with timestamps, and time signature. Then play what you decoded, learn it with the practice kit, and get any recording or video sounding platform-ready without opening a computer.

DECODE ANY SONG

• Record up to 5 minutes or upload MP3, WAV, M4A, FLAC, AAC, OGG, AIFF
• Drag the waveform to pick exactly which 15 to 60 seconds to analyze
• Auto-detects key, BPM, time signature, and the full chord progression with timestamps
• Genre, instruments, and song recognition (premium)
• Tap any value to fix it. Your ear always wins.

PLAY AND PRACTICE

• Synth Chords: hear every chord played back in time
• Slow-Downer: 1x, 0.75x or 0.5x, pitch preserved
• Section Looper: tap measures to loop a tricky phrase
• Transpose: shift chords and key by up to 6 semitones either way
• Metronome locked to playback, and a chromatic tuner on the record screen
• Export MIDI two ways: the chord chart as block chords, or the melody transcribed note by note on your device

FOUR AI MUSIC THEORY MODES

• Theory: Roman numerals, harmonic function, tonal center, and a practical tip
• Solo Guide: per-chord scales, target notes, guide tones, tensions, and licks
• Reharmonize: substitutions, tritone subs, ii-V insertions, and color chords
• Explain Simply: plain-language breakdown for beginners, with play-along ideas Color-coded chips mark diatonic, borrowed and secondary chords. The lead sheet follows playback in real time.

POLISH ANY SOUND, EVEN VIDEO

• Video in, video out: drop a video, get clean platform-ready audio back as video. Video editors fix the picture, SoundBud fixes the sound.
• Voice-Over: de-esser, breath removal, clarity, room-tone reduction
• Ducking: auto-dip background music under your voice
• 6-band EQ and compressor: Light, Medium, Heavy, or fully manual
• Tighten: remove long silences from voice recordings in one tap
• On-device noise reduction, files up to 90 minutes, lossless trim
• True-peak limiter, LUFS comparison meter, publish-readiness verdict, AI Tips
• A/B preview, undo/redo, export as WAV or 320 kbps MP3
• One tap sets the loudness and true-peak target for Spotify, Apple Music, YouTube, TikTok, Podcast or Instagram

CREATE AND SHARE

• Sound-reactive 3D visuals, customizable and exported as a video
• Quick, fun music-theory quiz cards while you wait

LIBRARY AND EXPORT Every decoded track is saved to your Library to search, sort, replay, and edit. Export a clean PDF lead sheet with chords, theory, and AI insights (premium).

A Dark Studio interface inspired by professional DAWs. English and Turkish. Western and Solfege notation. iOS 15.1 and up.

PREMIUM Free includes 4 song decodes per week (key, BPM, chords, time signature), 1 AI insight per day, 5 Polish actions per week, 5 library saves per month, 1 video polish per month, and 1 video export per month (Spectrum Bars visual, watermarked).

Premium removes the limits and unlocks everything: all four AI modes, genre and instrument detection, song recognition, the full Play and Practice kit, the advanced Polish suite (voice-over, 6-band EQ, manual compression, all platform presets, true-peak limiter, LUFS meter, video polish), PDF export, every 3D visual with unlimited watermark-free video export, and no ads.

Premium is a monthly or yearly subscription. It auto-renews unless canceled at least 24 hours before the period ends. Manage or cancel anytime in your iOS subscription settings.

Privacy: your audio is processed for analysis and deleted right after. Nothing is kept on our servers, and AI insights use anonymized metadata only.

Terms: https://soundbud.alpaconaudio.com/en/legal#terms Privacy: https://soundbud.alpaconaudio.com/en/legal#privacy Support: info@alpaconaudio.com