Audio Compare
Free online audio comparison tool. Compare two audio files using AB testing and statistical analysis. Measure RMS, peak, spectral centroid, rolloff and more. Perfect for audio engineers and producers.
About Audio Compare
This professional audio comparison tool allows you to compare two audio files using AB testing and detailed statistical analysis. Perfect for comparing different masters, audio formats, effects, or quality settings. All processing happens locally in your browser for complete privacy.
What audio formats are supported?
All common audio formats are supported including MP3, WAV, OGG, AAC, M4A, FLAC, OPUS, and more. You can compare files in different formats.
What is AB testing?
AB testing is a method where you quickly switch between two audio sources (A and B) to directly compare their sound quality. This tool maintains the same playback position when switching, making it easy to hear subtle differences. Use the Switch button or play A/B individually.
What metrics are compared?
RMS Level (average loudness), Peak Level (maximum amplitude), Spectral Centroid (brightness/tonal center), Spectral Rolloff (high-frequency content), Spectral Flatness (noisiness), and Zero Crossing Rate (percussiveness/transitions).
What is Spectral Centroid?
Spectral Centroid represents the 'center of mass' of the spectrum - essentially where most of the audio energy is concentrated. Higher values indicate brighter, more treble-focused sound. Lower values indicate darker, bass-heavy sound. Measured in Hz.
What is Spectral Rolloff?
Spectral Rolloff is the frequency below which a certain percentage (usually 85%) of the spectral energy is contained. It indicates the amount of high-frequency content. Higher values mean more high-frequency content, while lower values indicate more bass-focused audio.
What is Spectral Flatness?
Spectral Flatness measures how noise-like a sound is versus how tone-like it is. Values near 1.0 indicate white noise (flat spectrum), while values near 0.0 indicate pure tones (pitched sounds). Useful for distinguishing between musical content and noise.
What is Zero Crossing Rate?
Zero Crossing Rate (ZCR) is the rate at which the audio signal changes from positive to negative or vice versa. High ZCR indicates high-frequency content, noise, or percussive sounds. Low ZCR indicates low-frequency or sustained sounds. Useful for audio classification.
How do I use AB testing effectively?
1) Load both audio files, 2) Play Audio A and listen carefully, 3) Click Switch to instantly compare with Audio B at the same position, 4) Switch back and forth multiple times to hear differences, 5) Enable Loop to repeat a specific section. Focus on one aspect at a time (bass, treble, clarity, etc.).
What do the difference percentages mean?
The difference percentage shows how much Audio B differs from Audio A. Positive (+) means B is higher/more than A. Negative (-) means B is lower/less than A. For example, +10% RMS means Audio B is 10% louder than Audio A.
Can I compare different file formats?
Yes! You can compare any two audio formats. This is useful for testing lossy compression (MP3 vs FLAC), evaluating different bitrates (128kbps vs 320kbps), or comparing before/after audio processing.
What should I look for when comparing audio?
For loudness: Compare RMS and Peak levels. For brightness/tone: Check Spectral Centroid. For high-frequency detail: Look at Spectral Rolloff. For overall character: Compare Spectral Flatness. Use AB testing to hear these differences subjectively.
Is my audio file safe?
Absolutely! All audio analysis and playback happens directly in your browser using Web Audio API and Meyda. Your audio files are never uploaded to any server. Everything stays private on your device.