Stop Fighting
the Fretboard.
Turn any chord progression into smooth voicings on guitar.
Smart shapes, key detection, and 10+ powerful tools.
Built to compose, practice, and apply harmony.
See it work
Try the engine. Right now.
Get access to 10+ powerful tools like this one.
Type a chord progression or pick one. The engine computes the smoothest voicing path across the fretboard in real time.
The problem
Other tools guess.
You deserve answers.
You search "Dm9 voicing guitar" and get a blog post from 2011. You try an app and it shows you one voicing, the hardest one. You piece things together from five different tabs.
Music theory is precise. Your tools should be too.
The solution
A structured engine
that actually knows music.
FretMotion computes from first principles: intervals, harmonic relationships, and the physical reality of the guitar neck. Every answer is deterministic, correct, and instant.
No retries. No randomness. No credits per query. Learn how the engine works →
Under the hood
One engine. Infinite possibilities.
FretMotion is one of the most complete guitar theory engines available. It doesn't just know notes. It understands music.
Parses everything
Jazz symbols (Δ7, ø), slash chords (Am7/E), tab shorthand, obscure extensions (9#11). Every notation system, one parser.
Generates any voicing
Guitar chord chart and voicing generator. Any chord, any tuning, any position. With real finger assignments, barre detection, and playability filtering.
Optimizes transitions
Smooth voice leading that minimizes hand movement. Shell voicings for jazz, open shapes for beginners. You set the constraints.
Understands harmony
Key detection, scale harmonization, chord substitutions, reharmonization. Roman numeral analysis for any key, any mode.
Guitar-native
Standard, Drop D, Open G, DADGAD, and alternate tunings. Capo chart and optimization. Built around the guitar, not bolted onto a piano tool.
Instant & deterministic
No waiting for a model to "think." No rate limits, no credits. Same input → same answer, every time. Real-time computation.
Explore all tools
10+ powerful products. One subscription.
Every tool is powered by the same engine. Master one, and you'll understand what all of them can do.
Fifth Circle Progression Builder
"What chords go together in any key?"
Interactive circle of fifths for guitar. Tap chords to hear them, see voicings, and build progressions visually.
Chord X-Ray
"How do I play this chord?"
Guitar chord finder and chart generator. Every voicing, fingering, and diagram for any chord symbol.
Song Workshop
"These changes feel awkward…"
Paste a progression. Get the smoothest voicing path, transpositions, and capo.
Harmony Lab
"What chords fit this key?"
Pick a key and scale. See every diatonic chord with Roman numerals.
Fretboard Map
"Where are the notes?"
Guitar scale finder. Visualize any scale or chord across the entire fretboard.
Practice Builder
"What should I practice?"
Learn guitar chords faster. Find your weakest transitions and the best next chord to learn.
What Key Is This?
"Am F C G... what key?"
Paste any progression. Instantly identify the key and scale.
Singer Adapter
"I need this in Eb"
Transpose to any key, find the best capo position, get playable voicings.
Chord Simplifier
"I can't play Cmaj9#11…"
Easy guitar chords from complex symbols. Turn any chord into simple shapes you can actually play.
Style Converter
"Make it sound jazzy"
Re-voice any progression as jazz shells, folk shapes, or minimal voicings.
Reharmonizer
"My I-IV-V is boring"
Chord substitution guide. Diatonic swaps, secondary dominants, tritone substitutions, with voicings.
Style Explorer
"Which style fits this best?"
Compare jazz, rock, folk, power, and minimal voicings side by side.
Progression Generator
"I need a chord progression…"
Chord progression generator. Pick a genre and key, generate a progression, then tweak each chord with one click.
Who it's for
Built for guitarists who want to understand and master harmony.
Intermediate guitarists
Learn guitar chords beyond the basics. Discover new voicings, understand keys, and connect chords with intention.
Jazz and neo-soul players
Jazz guitar chords, richer voicings, cleaner resolutions, smoother movement through changes.
Singer-songwriters
Find the right key, the best capo, and playable chord paths that sound better without overcomplicating.
Teachers and students
Show how progressions move across the fretboard. Visual, practical, repeatable.
Arrangers
Turn harmony into something playable, not just theoretical.
The difference
Most tools show shapes. FretMotion understands music.
Without FretMotion
- Random chord shapes from a dictionary
- Inconsistent fretboard jumps
- Awkward stretches between changes
- More guesswork, slower practice
With FretMotion
- Voice-led voicing paths
- Minimal hand movement
- Style-matched shapes
- Harmony analysis, key detection, reharmonization
- Instant, repeatable results
Don't see what you need?
Request a tool. We'll build it.
The engine can do far more than what's on this page. Tell us what you need. If the engine can compute it, we'll ship a new tool for it. Your subscription covers everything we build.
Request a product →Simple pricing
One plan. Everything included.
- All 10+ powerful tools, unlimited use
- Every future tool we ship
- All tunings, all chord types
- Instant computation, no rate limits
- Request new tools anytime
- Cancel anytime, no lock-in
Questions
Frequently asked
No. If you know the chords you want to play, FretMotion finds better ways to play them. The engine handles the theory.
No. Chord dictionaries show isolated shapes. FretMotion optimizes how chords connect across an entire progression.
Yes. Standard, Drop D, Open G, Open D, DADGAD, half-step down. Capo at any fret. All tools support all tunings.
It's a structured computation engine built on music theory. It generates every playable voicing, then uses dynamic programming to find the smoothest path. Same input, same answer, every time. Learn more →
Yes. One click. No lock-in, no cancellation fees. You keep access until the end of your billing period.
What makes a chord progression playable?
Playability depends on fret distance between shapes, common tones shared across chords, finger stretch, and the tuning you're in. FretMotion measures all of these and finds the voicing path with the least total cost.
Voice leading on guitar
Voice leading is the art of moving individual chord tones smoothly from one chord to the next. On guitar, this means choosing shapes where notes stay close on the fretboard. FretMotion computes optimal voice leading automatically for any progression.
Your playing will thank you.
Every progression you play can be smoother. Every chord you learn can be easier. The engine is already running. You just need to use it.
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