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.
Listen to and learn hundreds of bird songs and calls from across the continental United States, with up to 34 seconds of song for each bird, and alternative recordings for some birds
$3.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Chirp! Bird Songs & Calls USA: 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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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
Assumption to check: Limited bird songs for free users
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Audio playback issues on some devices
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Listen to and learn hundreds of bird songs and calls from across the continental United States, with up to 34 seconds of song for each bird, and alternative recordings for some birds. Choose a state or group of states then sort the bird sounds in a variety of ways. Sort by song style to compare birds that hoot and coo, with birds with high pitched songs, or you might like to sort the birds by commonness, so you can listen to the most common ones first, then move on to less frequent backyard visitors. More advanced birders may like to listen to birds from a particular habitat, such as forest or freshwater for example. You can make lists of your favourites so that you can find them quickly. Use the quiz to test your memory. Answer fast to earn a score multiplier and get on the high score table. Experienced birders can use the custom quiz to help distinguish and learn similar songs. And when you need a rest, try the slideshow feature - choose which birds to include, maybe add background bird song, then simply relax. If you want to continue learning while you relax, switch the voiceover on and hear the name of the bird announced at the end of each clip. This is also a good way of competing with the family - who can say the name of the bird first? Bird names are available in Spanish and French, and as scientific names. Problems? Email us: [email protected]
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.