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
Rx Noise- Pink Noise for Sleep
Recorded and mastered specifically for sleep and concentration, Rx Noise’s pink noise app will help soothe you to deeper levels of sleep and concentration
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
2,290 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.
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 included14 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 Rx Noise- Pink Noise for Sleep: 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 sounds and customizable options.
Assumption to check: Limited sound options compared to other apps
Validate with people who use this workflow before building.
Hypothesis 2
Create an ad-free experience for better focus.
Assumption to check: Can be distracting with ads in free versions
Validate with people who use this workflow before building.
Hypothesis 3
Implement sleep tracking to monitor sleep quality.
Assumption to check: Lack of sleep tracking features
Validate with people who use this workflow before building.
Hypothesis 4
Add capability to share sounds or sleep routines with friends.
Assumption to check: No social sharing 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
Recorded and mastered specifically for sleep and concentration, Rx Noise’s pink noise app will help soothe you to deeper levels of sleep and concentration. Pink Noise vs White Noise, what is the difference? Simply put, pink noise is smoother than white noise and is considered more soothing to the human ear that white noise. Imagine having an app that plays soothing sounds for deep sleep throughout the whole night. An app that uses science-based sound which has shown improvement in sleep, memory, attention, and concentration. Introducing Pink Noise for Sleep, the simplest endless pink noise app. Press play and enjoy deep calming noises which use all frequencies that the human ear can hear (20 to 20,000 hertz) mastered and equalized specifically for the iphone to transmit the soothing sound of pink noise ◉ HQ PINK NOISE Pink noise is not something new. You’ve heard it all around you (fan, ocean waves, wind, rainfall) and is very similar to white noise. Unlike white noise, the higher pitched frequencies are lower in volume in pink noise, creating a much less “harsh” sound. ◉ IMPROVE SLEEP, MEMORY & FOCUS Think of it as the quickest way to calmness and peace. Just press play before sleep and enjoy deep sleep and fall asleep faster. Use it daily and enjoy improved memory too. Put your headphones on, and instantly concentrate with deeper focus when working and studying, Alternatively, meditate and simply block surrounding noise by simply listening to this deep & balanced pink noise. ◉ PLAY THE PINK NOISE ENDLESSLY Forget about interruptions. Our simple pink noise generator has a simple press to play & pause interface. Press play and enjoy uninterrupted pink noise sleep sounds. When you are done simply press the pause button or turn off the app. Whether you are looking for sounds that enable deep sleep and concentration or you are simply having a hard time to fall asleep, Pink Noise for Sleep is a must-have. Don’t delay and experience the optimal fusion of high and low frequencies to improve sleeping and memory! Sleep better & remember more = > Get Pink Noise for Sleep
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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
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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.
