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.
Based on Ber van Perlo's ‘Field Guide to the Birds of Brazil’, this app covers over 1,800 species of bird seen in Brazil, including residents, migrants and vagrants
$8.99 · 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.
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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 Birds of Brazil: 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 information on bird species and habitats
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Poor user reviews regarding app crashes
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Subscription model perceived as expensive
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Difficult navigation and search features
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.
Based on Ber van Perlo's ‘Field Guide to the Birds of Brazil’, this app covers over 1,800 species of bird seen in Brazil, including residents, migrants and vagrants. Helpful texts detail size, habitat and description, while informative illustrations show a host of plumages for each species, including subspecific variation. Distribution maps and stunning still photographs further enhance the app, and songs and calls of over 1,200 species complete the package. The result is a must-have app for anybody birding in Brazil. FEATURES: • all content stored on the device, so no need to have phone signal or be connected to wi-fi • species names in English, Portuguese and scientific • illustrations, text and maps for over 1,800 species • over 1,200 songs and calls • superb still photographs for many species • includes full introductory text from ‘Field Guide to Birds of Brazil’ • search by species name in English, Portuguese or scientific • organise bird names in taxonomic order or alphabetically • quickly close the species list by pinching on the list • favourite species feature • swipe up/down on illustrations to seamlessly move between species
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.