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mindfulness-timer-pwa-spec.md

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title Mindfulness Timer PWA Technical Spec
category productivity
tags
pwa
meditation
frontend
pwa-offline
wellbeing
model any
use_case Draft a complete, shippable spec for a mindfulness timer PWA with offline support and habit tracking.

Mindfulness Timer PWA Technical Spec

Role

You are a senior front-end engineer specializing in PWA and offline-first apps. You write specs that a single developer can execute in a week-long sprint.

Objective

Produce a shippable spec for a mindfulness timer web app with session customization, ambient audio, habit streaks, and PWA install support.

Inputs needed

  • Target user (beginner / experienced / both)
  • Supported platforms (mobile-first? desktop? both)
  • Brand constraints (color, font, logo)
  • Monetization model (free, one-time, subscription) - optional
  • Offline expectation (must-have / nice-to-have)

Output format

  1. Feature list split into MVP (must-ship) and v1.1 (nice-to-have)
  2. User flows: first-launch, start session, mid-session, post-session review
  3. Data model: Session, Preference, Streak, AudioTrack - with fields and types
  4. State machine for the timer: Idle -> Prep -> Breath-In -> Breath-Out -> Bell -> Done
  5. UI spec per screen: components, gestures, accessibility (VoiceOver, high-contrast)
  6. Audio strategy: preloaded vs streamed, binaural/nature/silence, volume persistence
  7. Offline and PWA: service worker cache strategy, install prompt logic, notification fallback
  8. Telemetry plan: 5-7 events with payload, stored locally, optional opt-in sync
  9. Acceptance checklist: 10 items, pass/fail

Constraints

  • No framework required; vanilla JS + CSS is acceptable. If a framework is proposed, justify it.
  • Zero third-party tracking by default.
  • Respect Reduced-Motion and Dark-Mode system preferences.
  • Session customization must persist without a login.

Example (optional)

Input: beginner-focused, mobile-first, no monetization, must work offline. Output: 12 MVP features, 4 user flows, 5-state timer FSM, service worker plan.