Frost Arc is a polyrhythm studio 🎵 built on real Euclidean rhythm math. Instead of tapping cells into a rigid step grid, you stack several concentric rings 🔵 — each one spreads its beats as evenly as possible around the circle using the Bjorklund (Euclidean) algorithm, the same distribution that underlies rhythms from Cuban tresillo to West African bell patterns.

Set the number of steps and onsets on each ring, nudge its rotation 🔄, and press play ▶️. A single shared clock sweeps every ring at once, so rings of different lengths drift in and out of phase. Where two or more rings strike on the same beat, a coincidence lights up ✨ — these frozen arcs of light are the pulse of your combined groove, and the app pinpoints exactly where they fall using the rhythmic least common multiple of your rings.

Frost Arc uses an internet connection 🌐. It checks your connection each time it starts: when you are offline it shows a clear "No Connection" screen with a Retry button and continues the moment you are back online, and its Privacy Policy and Terms open right inside the app in a live web view, loaded from the web so you always read the current version. There are no accounts to create and no ads 🚫 — the polyrhythm weaving itself runs on your device, backed by an always-current online help and policy layer.

**Features:**

• **Weave Studio 🎛️** — a live ring canvas with a sweeping pointer, onset flashes and coincidence bursts; drag a ring to rotate it, long-press to solo one, and tune each ring with steppers and a tempo dial.

• **Pattern Library 📚** — a dozen real world rhythms (tresillo, cinquillo, bossa nova, samba, Aksak, Venda clapping and more) alongside every weave you create.

• **Coincidence Lab 🔬** — a radial coincidence wheel with live analysis: cycle length, total onsets, coincidence count and density, all computed from your own rings.

• **Weave Composer 🎨** — build, name and save your own weaves, and attach a cover photo from your camera or gallery.

• **Guide 💡** — an interactive lesson that shows how the Euclidean distribution spreads beats around the circle as you change the numbers.

• **Connected essentials 🌐** — a start-up connectivity check plus an always-current Privacy Policy and Terms that load online in an in-app web view.

Whether you are a musician sketching a groove 🎶, a producer hunting for an unusual meter, or simply curious how mathematics shapes rhythm 🧠, Frost Arc turns polyrhythm theory into something you can see, edit and feel.

Frost Dusk Ventures

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