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 David Wagner’s renowned Princeton field guide Caterpillars of Eastern North America, this exciting new app is the ultimate digital pocket guide for quickly and easily identifying the most common native caterp...
$4.99 · 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 Caterpillar Id USA East Coast: 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 species information and identification features
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No offline access to data
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchase complexity
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 David Wagner’s renowned Princeton field guide Caterpillars of Eastern North America, this exciting new app is the ultimate digital pocket guide for quickly and easily identifying the most common native caterpillar species in Eastern North America—and for keeping a personalized log of your sightings! Covering 576 species and featuring more than 1,200 superb color images, the app is also useful for identifying caterpillars in the whole of southern Canada, parts of the Pacific Northwest, and, at a generic level, in most of the United States west of the Mississippi. Focusing on the larger, commonly encountered caterpillars that are most popular with gardeners, naturalists, and children, the app is designed to be enjoyed by nature lovers, hikers, and families, as well as by field biologists, zoologists, and other professionals. Each of the 576 species is illustrated with 1 to 4 photos, with most of the main pictures showing the full-grown caterpillar, and other photos showing color variations and, for 383 species, the adult butterfly or moth as well. An abundance of information is given for each species, including taxonomy, description, occurrence, food, and additional interesting facts. All species are listed by their scientific and common names and can easily be compared by browsing according to their taxonomic classification. A simple identification key narrows down potential species and consists of a choice of 9 major morphological traits, including 42 sub-traits, ranging from color combinations to body features, such as tails, knobs, and hair. • Covers 576 caterpillar species • Features 1,216 superb color images • Offers 3 ways to sort and display species: gallery, A–Z, or taxonomic • Lists caterpillars by their common and scientific names • Allows you to compare caterpillars next to each other—up to 8 on an iPhone and 16 on an iPad • Enables you to log your sightings, make notes for each, and sort your list by place, date, group, and name • Plots sightings automatically on an editable map via GPS • Includes export function for sending each list to any email address as a CSV data file Once you download the app, no internet connection is needed—just get the app and get started! Visit our website for further information: http://sunbird.tv/de/sunbird-apps-ebooks/
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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.