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
Siren Sounds!
Sound the alarm! The best siren and alarm sounds app is here!
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
31 ratings · Top 30%
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 included13 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 Siren Sounds!: map the core Entertainment 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
Increase the variety of sirens and add user submissions.
Assumption to check: Limited sound selection
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline access for downloaded sounds.
Assumption to check: No offline access
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing features for favorite sounds.
Assumption to check: No sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to create playlists of their favorite sirens.
Assumption to check: Limited customization
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
Sound the alarm! The best siren and alarm sounds app is here! This app features genuine siren and alarm sounds that you can play anytime! You'll find a variety of siren and alarm sounds just like you'd hear in real life. From police and fire engine sirens to security and car alarms, this app has it all. You'll hear wailing sirens, and honking and beeping alarms. Feeling homesick for the city? Just play a loud, earsplitting siren noise and you'll feel like you're at home on the streets of New York or Los Angeles! These alarm sounds sound so real you could even use them to try to deter a burglar or suspicious individual lurking near your home or office. These alarm sounds can be fun too! Use them to pull pranks on your friends! Children and babies will love learning the different types of alarm and siren noises. Can you identify which type of alarm is featured in each sound? With this app you'll gain access to life-like siren and alarm sounds that can be used for both practical and fun purposes!
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.
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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.
