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.
Full featured digital field guide for birding in Costa Rica.
$14.99 · 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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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 Costa Rica Birds: 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 offline access to bird calls and images.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Search functionality can be slow with many birds.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of user-generated content or community features.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Not enough filtering options for bird searches.
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.
Full featured digital field guide for birding in Costa Rica. Costa Rica Birds includes all of the birds that have occurred in this beautiful country as well as several species that may eventually occur. This digital field guide requires no Internet connection and has a wealth of information and features that make it an excellent reference guide before, during, and after any trip to Costa Rica. Since this app was released in 2015, local bird experts in Costa Rica have updated features and information to turn this app into a comprehensive digital tool that can be personalized with target lists, lists of birds seen and heard, and notes. It also includes accurate and up to date information about bird identification, habits and habitats for 930 plus species on the Costa Rica list as well as 70 plus additional species that may eventually occur in Costa Rica. Features include: • Full-featured birding field guide for Costa Rica. • Images and vocalizations for more than 1000 species. • Information, field marks, range maps and tips for seeing each species in Costa Rica. • NO ADVERTISEMENTS. FREE UPGRADES WITH ADDITIONAL IMAGES AND SOUNDS. • Additional features to customize your birding experience: • Comprehensive SEARCH filter • -Search by name • -Sorting options, including by family, group, bird characteristics, region, habitat, nocturnal and regional endemic birds and more! • -Make target lists • -Check as seen, heard, or unseen/heard • -Personal notes • -Camera • -Similar Species feature to compare similar birds. • -Information about major habitats in Costa Rica. • -Information about Conservation status. • ‘Which Bird is it?' Record and photo bird, email to us for help in identification. • Larger font for easier reading. • Pinch images to make them bigger.
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.