Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Serenity: Meditation Timer
Serenity is a beautifully crafted Meditation Timer, perfect for quiet contemplation, stillness and defined focus.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
209 ratings · Top 5%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Serenity: Meditation Timer: map the core Health & Fitness workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Offer a broader library of sounds and customizable audio settings.
Assumption to check: Limited sound options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing to allow users to share their progress and sessions.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Implement reminder notifications to encourage daily practice.
Assumption to check: Lack of reminders for meditation
Validate with people who use this workflow before building.
Hypothesis 4
Add visual progress charts to help users see their meditation journey.
Assumption to check: Difficulties in tracking progress over time
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Serenity is a beautifully crafted Meditation Timer, perfect for quiet contemplation, stillness and defined focus. • Featured on the App Store Homepage. • Top 10 Meditation & Mindfulness App, US and Canada. Take a deep breath, relax, and allow Serenity to guide you through your daily meditation. Chiming gently throughout your session at times chosen by you. Tibetan Chimes, Singing Bowls, Gongs, Bells and even Didgeridoos form part of your 16-tone collection. Recorded in an HD studio with the utmost of care, these tones sound just incredible. Tempting you into a deeper state of relaxation with every chime. * FEATURES * • Define your Preparation, Meditation, Interval and Cool down times. • Automatically save your selection in one of six customisable presets. • Choose from a collection of 16 HD meditation tones • Assign the tone to chime once, twice or thrice on command. • Adjust your Interval tone, allowing it to repeat or chime at a chosen time. • Enjoy a silent meditation with *vibrational alerts. • Set a daily, weekly or weekend reminder to meditate. • A statistics page, keeping a silent record of your meditation progress. • Apple Health compatible. Sync your meditation data. • Apple Music compatible. Add your own music and have it play behind your selected tones. Although minimal and elegant by design, Serenity really has all you need to create the perfect environment for the ultimate mindful meditation. Allowing you to concentrate on your inner self, rather than the passing time. Its the only meditation timer you'll ever need! *Vibration not available on iPad
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Navigation
React Native Sound
Zustand
Expo AV
React Native Gesture Handler
BUILD KIT DIFFICULTY
Starter
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
