Professional online tools for DJs and music producers. Calculate BPM, find song keys, adjust tempo, and more - all free in your browser.
Calculate beats per minute from time and beats. Essential for beat matching and tempo analysis.
Find the BPM of any song by tapping along to the beat. Real-time tempo detection.
Convert BPM to milliseconds for delay times, reverb settings, and sync calculations.
Detect the musical key of songs for harmonic mixing and mashup creation.
Calculate optimal transition points and tempo adjustments for smooth mixes.
Free DJ set length calculator. Plan your DJ set by calculating how many tracks you need, average track length, and total set duration
Generate practice sequences for scales, set tempo, direction, repeats, and play a simple tone or metronome.
Free mix compatibility checker. Check if two tracks are compatible for DJ mixing based on key and BPM analysis.
Transpose musical keys up or down by any number of semitones.
Convert beats per minute (BPM) to playback speed multiplier.
calculates how much pitch changes when tempo is changed without time-stretching
Modern DJs and music producers rely on accurate tempo, key, and pitch analysis to deliver professional-quality mixes. Whether you are preparing a DJ set, beatmatching tracks, planning harmonic transitions, or practicing music theory, online DJ tools help streamline your workflow without installing heavy software.
DiamondAudioCity provides a complete collection of free DJ and music production tools designed for tempo detection, BPM calculation, harmonic mixing, pitch shifting, and DJ set planning — all accessible directly in your browser on desktop or mobile.
BPM (beats per minute) is the foundation of DJ mixing and music production. Accurate BPM analysis allows DJs to beatmatch tracks smoothly, synchronize effects, and maintain consistent energy across a set. Producers use tempo analysis to structure songs, loops, and rhythmic patterns across genres such as EDM, house, techno, and hip-hop.
Our BPM tools support manual BPM calculation, tap-tempo detection, tempo conversion, playback speed analysis, and BPM-to-pitch relationships — making them ideal for DJ prep, remixing, and live practice. For precise timing control during practice or production, DJs often combine tempo tools with an online metronome to maintain consistent rhythm and beat accuracy.
Harmonic mixing ensures that tracks blend smoothly without musical clashes. DJs often rely on musical key detection, Camelot wheel compatibility, and pitch control to create seamless transitions. Producers also use key and pitch analysis when remixing or adjusting melodies.
These tools help you detect song keys, transpose musical scales, and shift pitch without affecting tempo — all optimized for DJ and producer workflows.
Smooth transitions require more than matching BPM. DJs must consider key compatibility, tempo differences, energy levels, and timing. Planning transitions in advance improves set flow and reduces mistakes during live performances.
Professional DJs and producers prepare their sets in advance. Planning total set duration, track count, and practice routines leads to better time management and performance confidence. Many DJs also use scale and key exercises alongside tempo planning to improve harmonic awareness, often practicing with a scale finder to strengthen melodic and harmonic skills.