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
SoundHub - Animal Sounds
Listen to Over 100 Animal Sounds from Nature!
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
16 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 included17 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 SoundHub - Animal Sounds: map the core Reference 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
Enhance the library with user-uploaded content and community features.
Assumption to check: Limited sound library compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Add offline storage capabilities for downloaded sounds.
Assumption to check: No offline access for sounds
Validate with people who use this workflow before building.
Hypothesis 3
Implement filtering by category, duration, and popularity.
Assumption to check: Lack of advanced search filters
Validate with people who use this workflow before building.
Hypothesis 4
Add functionality to share sounds on social media platforms.
Assumption to check: No social sharing 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
Listen to Over 100 Animal Sounds from Nature! The ultimate educational tool for teaching children about animals! The Sound Library app features hundreds of animal sounds, including dinosaurs, bears, bees, camels, cats, dogs, gorillas, deer, dolphins, pigeons, ducks, eagles, elephants, cheetahs, tigers, horses, lions, monkeys, mosquitoes, mice, owls, pandas, parrots, peacocks, pigs, sheep, seals, whales, wolves, zebras, and various sounds of nature such as wind, rain, water, thunder, fire, and insects, as well as soothing sounds for sleep. With these animal sounds, you can teach your child about different animals and even interact with them. This app is not only a great educational aid but also a source of fun for you and your children to explore nature together. We encourage you to leave comments and share your stories and creative uses with us! This app is completely free—download now and enjoy a close encounter with nature! Let Sound Library be your best companion for learning and exploring with your child!
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
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.
