Two instruments, never blended
Go looking for a "cuatro" without naming a country and you can end up with either of two instruments. One has ten steel strings in five doubled courses, a keyhole body and a bright ringing voice; it plays melody with a pick and it belongs to Puerto Rican jíbaro music. The other has four single nylon strings, a small guitar shape and a job in the rhythm section; it is strummed with the whole hand and it belongs to Venezuelan joropo. Most references cover one and mention the other in a footnote. This one covers both, on separate pages, with separate charted libraries — and a page whose whole job is telling them apart with numbers rather than adjectives.
Every grip computed against its own strings
A chord diagram is a claim about pitches, and a diagram borrowed from a differently tuned instrument spells something other than what the page says. So each instrument here draws from its own charted library, and the tuning facts the copy leans on — what the open strings spell, how wide the open voice is, where the tuning folds back on itself — are recomputed from the instrument registry every time CI runs. If the registry changed underneath a sentence, the build would fail rather than let the sentence keep standing.
The strumming hand gets its own engine
On the four-string instrument the interesting question is rarely which chord. It is what the other hand is doing: six slots to the bar, counted three ways and six ways at once, with braked strokes that make no pitch at all. The golpe pages declare every one of those slots, including the brakes and the rests, and derive the rest — stroke counts, where the brakes land, which metric reading each bar carries — from the declared cells. Nothing on those pages is typed by hand.
Hear everything
Every grip, note map and drill on the site plays back in the browser, so your ear can vet a shape before your fingers commit. The tuner and metronome are free, run entirely on your device, and need no account.
Part of the Warrior Network
Cuatro Warrior is made by Cyberpunk Industries LLC as part of the Warrior Network. When you want to compare an instrument beyond these two, String Warrior covers every chord and scale on 20+ string instruments — the sites share their underlying music data, and each writes its own pages for its own players.
No ads, no tracking accounts
There is nothing to buy here and nobody to sign up with. Preferences like your theme and left-handed setting live in your browser’s local storage and never leave your device. Details are in the privacy note.