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
White Noise Baby
Recommended by Katie Couric as an APP-solutely fabulous baby app for moms! Help your baby relax, stop crying, and sleep better
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
1,739 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/
Preview a sample Build Kit No email needed
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 White Noise Baby: map the core Lifestyle 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 wider variety of sounds and sound customization options.
Assumption to check: Limited sound selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Ensure high-quality audio recordings for all sounds.
Assumption to check: Inconsistent audio quality
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to download sounds for offline playback.
Assumption to check: No offline access to sounds
Validate with people who use this workflow before building.
Hypothesis 4
Introduce advanced alarm features like gradual volume increase.
Assumption to check: Basic alarm features
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
Recommended by Katie Couric as an APP-solutely fabulous baby app for moms! Help your baby relax, stop crying, and sleep better. Includes perfectly looped sounds that your baby will love such as taking a car ride, classical music, conch shell, and doppler ultrasound of the womb. Need to quiet your baby while out in public? Try our baby rattle that includes complex shapes and fun sounds that will be sure to entertain. Need our sleeping sounds to activate when baby starts crying? Our Baby Monitor will do just that. White Noise Baby has so many great features, requested from parents like you, for your baby to enjoy! Features - Perfectly looped ambient sounds and music to help your baby sleep - Background audio support so you can use other apps while sound continues to play - Baby monitor plays sound when crying is detected - High Contrast Baby rattle with touch and shake controls to quiet a fussy baby - Download new sounds for free using the White Noise Market companion app - Baby mode notification to reduce interruptions - Sound shutoff timer (fades volume to silence) with baby monitor restart - Event log of noise detection helps discover your baby's sleeping cycle - Tips to help your baby sleep great - Safety tips from the US Consumer Product Safety Commission - iPhone 5, SE, 6, 6+, 7, 7+, and iPad Air with Retina display support - Optimized for longer battery life. No ads! HD Ambient Sounds - Air Conditioner - Car Ride - Train Ride - Truck Ride - Conch Shell - Doppler Ultrasound - Hair Dryer - Fan - Vacuum Cleaner - Blue Noise - Gray Noise - Pink Noise - Brown Noise (aka Red Noise) - Violet Noise - White Noise - Dripping Water - Water Rumble - Grandfather Clock - Heartbeat - Wind Chimes HD Classical Music Tracks - Beethoven Fur Elise - Brahms Lullaby - Chopin Nocturne No 9 - Liszt Consolation No 6 - Tchaikovsky Sugarplum Fairy - Chopin Impromptu - Chopin Prelude Op 28 - Chopin Walzer - Mozart Sonata Facile - Mozart Sonate Op KV331 Baby Mode detects if your device is in airplane mode which lets you know if White Noise Baby could be interrupted making it tough for your little one to sleep. Safety tips provided by the US Consumer Product Safety Commission and includes important hazard information for cribs, toys, bathing aids, baby gates, high chairs, playpens, rattles, squeeze toys, teethers, toy chests, walkers, and others.
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
Supabase
react-navigation
expo-av
@supabase/supabase-js
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.
