Cascadr Juggle Lab

Type 531. Watch it turn green: 3 balls, period 3. Then throw along to the beat and find out, to the millisecond, whether you were on time.

Cascadr Juggle Lab is a siteswap engine for jugglers. Instead of guessing whether a pattern is real, you type the notation and the app checks the math instantly, animates the throws on a ladder diagram, and turns your metronome into a timing coach.

WHAT MAKES THIS DIFFERENT

Most juggling apps show you videos. This one treats siteswap as what it is: mathematics. Every pattern you type is validated against the actual rules jugglers use.

• The average-height rule: the throws have to average to a whole number of balls, or it is not a real pattern.
• The collision rule: two balls can never land on the same beat.

If a pattern breaks a rule, the app does not just say "invalid" — it tells you why. It names the fractional ball average, or points to the exact beats that collide. And when a pattern is valid, you instantly see the required ball count and the period.

KEY FEATURES

• Live siteswap validator — type any sequence (531, 441, 97531) and get instant VALID / INVALID feedback with a plain reason.
• Ball count and period — every valid pattern reports how many balls it needs and its true period.
• Animated ladder diagram — a space-time view of the pattern with two hand columns; cross-hand throws arc across, same-hand throws bow out, and the active beat lights up in crimson as it plays.
• Built-in metronome — set the tempo anywhere from 60 to 180 BPM with a slider or fine +/- buttons.
• Three cue styles — a sharp CLICK woodblock, a clean BEEP tone, or SILENT for visual-only timing. All sound is synthesized on the device.
• Drill Practice Mode — hit the big THREW button on each beat and the app measures your offset in milliseconds.
• On-time, early, late — every throw is rated green (within 150ms), yellow (early), or red (late), with the exact offset shown.
• Session stats — track throws logged, accuracy percentage, and drill duration in real time.
• Pattern library — load classics like the 3-ball cascade, 4-ball fountain, 5-ball cascade, Half-Box 441, The Tower 531, Shower 51, The Box 522, Flash 55500, and the 7531 tower.
• Favorites — star any library pattern or save your own; they persist on your device.
• Left/Right or Hand 1/Hand 2 labeling, plus a full dark mode terminal theme.

HOW IT WORKS

Type a siteswap on the home screen and confirm it validates.

Pick a tempo and a cue sound, then start the metronome and watch the ladder diagram play in time.

Flip on Drill Practice Mode and tap THREW on the beat. Chase a higher accuracy percentage as you dial in your rhythm.

PERFECT FOR

• Beginners learning what siteswap notation actually means.
• Intermediate jugglers checking whether a pattern they invented is legal.
• Advanced jugglers running timing drills on fast patterns like 97531 and 7531.

PRIVACY

There is no account, no sign-up, and no ads. Your patterns, favorites, and settings are stored only on your device, and nothing you do is uploaded or tracked.

Stop guessing whether a pattern works. Type it, prove it, and throw it on the beat. Download Cascadr Juggle Lab and turn siteswap into a science.