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
Bedtime Fan: White Noise Baby
*** The Right White Noise for a Good Night’s Sleep - The Wall Street Journal ***
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
197,973 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.
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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 included18 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 Bedtime Fan: White Noise Baby: 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 wider variety of soothing sounds and customization options.
Assumption to check: Limited sound options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Optimize app performance for lower-end devices.
Assumption to check: Some users report crashes on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription model and provide clearer benefits.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to set custom timer durations for better flexibility.
Assumption to check: Not enough timer options
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
*** The Right White Noise for a Good Night’s Sleep - The Wall Street Journal *** *** Why White Noise May Help You Get Your Best Sleep Ever - Healthline *** *** 19 best sleep apps for when you're feeling tired but wired - Women's Health *** √ Highest Quality Sleep √ Fall Asleep Faster √ 8 Soothing Fan Sounds √ Sleep timer with soft fade out √ Keeps running in background Extra Options √ Calming Camp Fire Scene √ Calming Rain Scene √ Calming Crickets Scene √ 5 Relaxing Binaural Music Tracks √ Remove ads Are you tired of spending hours lying awake in bed, struggling to fall asleep? Do you wish you could bring the soothing sound of a fan with you everywhere you go? Look no further than Bedtime Fan - the perfect app for a good night's sleep. Our high-quality fan sounds will transport you to a peaceful and relaxing environment, helping you drift off to sleep in 20 minutes or less. With the added bonus of calming scenes like a crackling campfire or gentle rain, you'll feel like you're sleeping in the great outdoors. Designed with parents in mind, Bedtime Fan is perfect for infants and young children who need soothing sounds to help them fall asleep. With our binaural music tracks, you can rest assured that you and your little ones will get the restful sleep you deserve. Don't let sleepless nights ruin your day. Download Bedtime Fan now and wake up feeling refreshed and ready to take on the world. Bedtime Fan offers an auto-renewing subscription at $19.99 USD a year. Your subscription will automatically renew at the end of each billing term and your credit card will be charged through your iTunes account. You can turn off auto-renew at any time from your iTunes account settings but refunds will not be provided for any unused portion of the term. Terms of use: https://bedtimefan.com/terms.html Privacy policy: https://bedtimefan.com/privacy.html
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
Expo
React Navigation
expo-av
Zustand
Supabase
React Native
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.
