Theory, tempo, and tuning
Music tools
Chords, keys, degrees, metronome, BPM, and tuners for music practice.
When you need to quickly understand the key of a progression, label chord degrees, or check which triads belong to a scale, a full notation editor is often too much.
Music tools run locally in the browser and help with harmony, tempo, and instrument tuning without dedicated music software.
This category includes chord analysis, key chord building, metronome practice, BPM tapping, instrument tuners, and approximate key detection from audio.
Music tools in this category
14 tools
Audio Key Detector
Guess a major or minor key from an uploaded recording by tracking a pitch and scoring it with Krumhansl-style profiles.
Use this tool when Need to find the musical key and scale of a song for mixing or mashups?
- Autocorrelation fundamental from 55 Hz to 1046 Hz
- Major and minor profiles for all 12 tonics
- A confidence that is relative to the best score
Bass Guitar Scale Fingering
Scale patterns for 4-string bass by position: one-finger-per-fret or Simandl 1-2-4 fingering, with roots, note names and degrees on the fretboard.
Use this tool when Building walking lines and need the scale under your hand in one position?
- Major, three minor forms, pentatonics, and blues
- One-finger-per-fret or Simandl 1-2-4 system
- Open position plus positions I-IX on a 4-string neck
Violin, Cello and Double Bass Scale Fingering
First-position scale fingerings for violin, viola, cello, and double bass: which finger plays each note, on which string, with low and high placements marked.
Use this tool when Starting a new scale on violin and unsure whether the second finger sits low or high?
- Violin, viola, cello, and double bass
- Major, natural, harmonic, and melodic minor
- First-position fingering with placements and extensions
Tap BPM Counter
Tap the button or the space bar and read BPM from the average gap between your taps.
Use this tool when Need to know the exact tempo of a song to create a remix or playlist?
- Tap button and space bar
- Average of the latest 12 gaps
- Per-tap BPM list for the latest six intervals
Chord Key Finder
Score the twelve major and twelve minor keys against a list of chord symbols and show the best five.
Use this tool when Do you need to identify the musical key that fits a specific sequence of chords?
- 24 candidates: 12 tonics times major and natural minor
- Quality match, a softer root-only match, and a penalty for an outside chord
- The top five keys, each with a confidence from 0 to 100
Guitar Scale Fingering
Map any scale onto the guitar fretboard by position: fingers 1-4, root markers, and the positions that cover the whole scale — for classical and any six-string guitar.
Use this tool when Learning a solo and need the scale pattern around the position where it is played?
- Major, three minor forms, pentatonics, and blues
- Open position plus positions I-IX with a shaded window
- Finger, note-name, or degree labels on every dot
Guitar and Ukulele Tuner
Tune guitar, ukulele, bass, violin, and mandolin with live microphone pitch detection.
Use this tool when Need to tune your guitar, ukulele, or violin using your device microphone?
- Live microphone pitch detection
- Note name and cents offset
- Common fretted and bowed tunings
Interval Ear Trainer
Hear two live-synthesized notes, name the musical interval, and let adaptive difficulty focus practice on your weakest intervals.
Use this tool when Drill interval recognition before a music theory exam or ear-training placement test, with the weakest intervals resurfacing automatically until they stick.
- Melodic and harmonic playback modes
- Adaptive difficulty weighted by your live accuracy
- Per-interval correct/wrong/accuracy breakdown table
Key Chord Builder
Build the diatonic chords of a selected key and label every degree with its harmonic role.
Use this tool when Do you want to explore all chords that belong to a specific musical key?
- Music theory analysis
- Degree and function labels
- Local browser processing
Metronome
Click from 30 to 240 BPM with a choice of beats per bar, note values, tuplets, and tap tempo.
Use this tool when Do you need to keep a steady pace during your daily music practice?
- Start, pause, reset, and adjustment controls
- Readable timing display
- Local session state with no account required
Piano Scale Fingering Chart
See the standard fingering for any major or minor piano scale on an interactive keyboard — right hand, left hand, one or two octaves, with thumb-under crossings marked.
Use this tool when Starting a new scale in your practice routine and can't remember which finger the left hand starts on?
- All 12 keys, major plus three minor forms
- Right hand, left hand, or both together
- One- or two-octave fingering with crossings marked
Rhythm Sight-Reading Trainer
Practice reading and tapping random rhythms with real, measured timing-accuracy feedback.
Use this tool when Drill rhythm sight-reading before a band or orchestra audition by generating a fresh random pattern each time, so you're reading rather than recalling a memorized exercise.
- Random rhythm generator for 4/4, 3/4, and 6/8 with quarter, eighth, sixteenth notes and rests
- Precise click-track playback and tap capture built on the Web Audio clock
- Per-note timing table with an overall rushing/dragging verdict and an average error score
Guitar & Bass String Tension Calculator
Calculate the real pulling tension of a guitar or bass string in lbs, kg, and Newtons from its gauge, your scale length, and the target note.
Use this tool when Check whether a 0.010" high E at a 25.5" Strat scale tuned to standard E4 lands near the textbook ~16 lbs before you trust a new set.
- Real physics for plain steel strings: cross-sectional area × steel density, no shortcuts.
- Transparent approximation for wound strings (nickel-wound, phosphor bronze, bass roundwound), labeled as an estimate.
- Quick-select scale length presets (Stratocaster, Les Paul, bass) plus free-form custom entry and note parsing in scientific pitch notation.
Ukulele Chord Diagrams
Type any chord name and see every playable ukulele chord shape in standard GCEA tuning — a real voicing search, not a static lookup chart, with every match you can page through.
Use this tool when Browse every playable shape for a chord like Am7 in standard GCEA tuning instead of settling for the single diagram a beginner lookup chart happens to show.
- Live chord-name parser with instant validation as you type
- Near-exhaustive search of a sliding fret window, base fret 0 through 9
- Paged SVG chord-box diagrams with a running "showing N of M" count
More tools
The rest of the catalogue. Each tool still runs in your browser.
Chord Chart Transposer
Paste a chord chart with lyrics and shift every chord by semitones, with a real chord-symbol parser and enharmonic-aware sharp/flat spelling.
Guitar Chord Diagrams
Type any chord name — Cmaj7, F#m7b5, G/B, anything — and get real, computed fretboard chord-box diagrams from a brute-force voicing search, not a static lookup image.
Step Sequencer
Program a 16-step drum beat with kick, snare, hi-hat, and clap, then export it as a real WAV file.