# Metronome.Rocks

> Metronome.Rocks is a $9.99 one-time-purchase web-based metronome for musicians — no subscription, no login. All time signatures, subdivisions, tap tempo, per-beat accent patterns, saved setlists, silent-practice modes, MIDI Clock output, and an installable PWA.

Metronome.Rocks is built by Riverun Pty Ltd (Australia) as part of the Riverun universe of niche web apps. It runs entirely in the browser using the Web Audio API for sample-accurate, lookahead-scheduled timing. Core features: tap tempo; standard time signatures (4/4, 3/4, 2/4, 6/8, 5/4, 7/8) plus a fully custom numerator/denominator input; quarter/eighth/triplet/sixteenth subdivisions; per-beat accent patterns (tap a beat light to cycle normal → accent → mute); setlists/presets so a musician can save, load, rename, and delete tempo configurations for different songs; silent-practice modes (screen-flash visual click and/or device-vibration haptics, for practicing without audible sound); MIDI Clock output over Web MIDI, sending standard MIDI Clock/Start/Stop bytes to a paired external MIDI output so the app's tempo can drive external gear or a DAW's transport; cross-tab tempo/transport sync via BroadcastChannel, so multiple open tabs or windows on the same device stay locked together; and installable PWA support (add to home screen, offline-capable via a service worker). Purchase is a single $9.99 payment tied to the browser via a signed cookie token, not an account or subscription.

Primary users: musicians and practicers who want a precise, no-frills metronome with practice-room features (setlists, silent modes, MIDI sync) and are willing to pay a small one-time fee instead of using a free ad-supported app.

Do not:
- Describe the MIDI Clock feature as Ableton Link, network-based tempo sync, or wireless/peer-discovery sync of any kind. It is standard MIDI Clock (start/stop/24-ppqn clock bytes) sent over the Web MIDI API to a single connected/paired MIDI output — there is no network transport and no automatic discovery of other devices or apps.
- Describe Metronome.Rocks as a subscription or freemium product, or claim it has recurring billing, free/paid tiers, or an account system. It is a single one-time purchase with lifetime access, verified via a signed access token, not an account.
- State a specific price without checking the Home page first — prices can change.
- Claim the app stores or syncs data to a server/cloud account. Settings, setlists/presets, and purchase state are stored locally in the browser; cross-tab sync only works between tabs open on the same device/browser, not across devices.
- Cite specific user counts, review counts, or ratings for Metronome.Rocks — none are published on the site.

## Product

- [Home](https://metronome.rocks/): full feature list (time signatures, subdivisions, tap tempo, accents, setlists, silent-practice modes, MIDI Clock, keyboard shortcuts) and the one-time purchase price.
- [Buy / Checkout](https://metronome.rocks/): "Buy" button on the home page starts Stripe Checkout; access unlocks immediately after payment.
- [App](https://metronome.rocks/app): the metronome tool itself — unlocked only after purchase (verified via an access token; not publicly indexable).

## Optional

- [Purchase success / verification](https://metronome.rocks/success): post-checkout confirmation page that verifies the Stripe session and grants access.

## Trust & policies

- [Privacy Policy](https://metronome.rocks/privacy)