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
Sleep Sounds: relaxing sounds
Sounds was recorded in most beautiful places around world
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
1,966 ratings · Top 15%
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 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 Sleep Sounds: relaxing sounds: 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
Expand sound library and allow user-uploaded sounds.
Assumption to check: Limited sound options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate sleep tracking to enhance user experience.
Assumption to check: No sleep tracking features
Validate with people who use this workflow before building.
Hypothesis 3
Optimize audio streaming for better performance.
Assumption to check: Inconsistent playback quality
Validate with people who use this workflow before building.
Hypothesis 4
Introduce guided meditations along with soundscapes.
Assumption to check: Lack of guided meditations
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
Sounds was recorded in most beautiful places around world. All sounds recorded with high quality stereo condenser microphones and preamps. (besides generated sounds: white pink brown noises and binaural beats) Additional features: Auto off timer Reliable alarm clock Sounds: white noise pink noise unicorn music box teddy bear music box ballerina music box cat purring morning forest creek in forest forest tropical jungle with tree frogs loro park bonfire heavy rain heavy thunder distant thunder rain under umbrella rain near window light rain on street rain on city street with traffic sea with seagull sand beach baltic sea beach underwater volcano night sea wind in open window wind at the door london train station australian subway moscow subway chinese bus highway new york silent street highway bridge oscillating fan 3D printer old radio tuning old english clock vacuum cleaner at work wind chimes gong 40" gong 38" binaural beat 1Hz lethargic binaural beat 2Hz deep sleep binaural beat 3Hz dreamless binaural beat 4Hz drowsy binaural beat 6Hz fantasy binaural beat 8Hz relaxed binaural beat 12Hz conscious binaural beat 16Hz focus binaural beat 24Hz active Roscoff port Amazon rainforest at night Pazin, Istria (Croatia) at night Eidar river (Iceland)
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 Native
Expo
Zustand
react-navigation
expo-av
expo-linear-gradient
BUILD KIT DIFFICULTY
Intermediate
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.
