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
Mr Brown Noise
Silence the noise around you.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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's included15 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 Mr Brown Noise: 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 including user-uploaded options.
Assumption to check: Limited sound options compared to competing apps
Validate with people who use this workflow before building.
Hypothesis 2
Introduce community features for sharing favorite sounds.
Assumption to check: No social features for sharing or challenges
Validate with people who use this workflow before building.
Hypothesis 3
Implement AI-driven suggestions based on user preferences.
Assumption to check: Lack of personalization and adaptive sound suggestions
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a subscription model with exclusive sounds and features.
Assumption to check: One-time purchase may deter long-term engagement
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
Silence the noise around you. Mr. Brown is a customizable brown noise machine designed to help you sleep, focus, and relax... your way. Unlike traditional noise apps, Mr. Brown lets you shape your sound in real time. Adjust bass, rumble, softness, and more to create the perfect environment for blocking distractions, calming your mind, or drifting off to sleep. Tune your perfect sound Dial in exactly what you need with intuitive sliders: • Boost bass to mask low-frequency noise • Reduce harshness for a softer, smoother sound • Fine-tune your mix for any environment Built for real life Whether you’re dealing with loud neighbors, street noise, or just need help focusing, Mr. Brown adapts to you. Use it for: • Sleep and relaxation • Deep focus and productivity • Travel, work, or home Save your favorite presets (Pro) Found the perfect sound? Save it and return anytime with one tap. Add rain for deeper calm (Pro) Layer in a soft rain loop to enhance relaxation and create a richer soundscape. Simple sleep timer Set a timer and let the sound gently fade out when you’re ready. Simple. Powerful. Designed for peace.
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
@react-native-community/slider
expo-av
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.
