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.
Princeton Field Guides are comprehensive, in-depth identification tools designed for all nature enthusiasts.
$34.99 · 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 Birds of Peru: map the core Books 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 content
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Cost may deter users
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Overwhelming amount of information
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Navigation can be confusing
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.
Princeton Field Guides are comprehensive, in-depth identification tools designed for all nature enthusiasts. This is the interactive mobile field guide version of Birds of Peru by Schulenberg, Stotz, Lane, O'Neill & Parker. Like the paper edition, it is the most complete and authoritative field guide to this diverse neotropical landscape, featuring every one of Peru's 1,817 bird species. Every distinct plumage is covered in superb, high-quality color illustrations. This mobile version includes all of the same excellent content of the print edition plus audio for 1,510 species and "Smart Search" by color, size and habitat. It has been updated to reflect the current eBird/Clements taxonomy. Peru is renowned for its spectacular array of wildlife and is home to nearly one fifth of the world’s bird species. It attracts birders and nature seekers from around the globe. The Birds of Peru mobile field guide is the most comprehensive and dependable birding tool for navigating this diverse neotropical landscape. This easy-to-use application comes equipped with concise species descriptions, range maps, audio of bird calls, and detailed illustrations. Birds of Peru simplifies bird identification with an interactive Smart Search tool, and it makes it easy to keep track of bird sightings with an updatable life list. Birds of Peru is an important and must-have tool for all bird enthusiasts traveling in Peru, and is also useful in Colombia, Ecuador, the Brazilian Amazon, and Bolivia. FEATURES: • Detailed species accounts for all of Peru’s 1843 bird species • Audio recordings for 1515 species, many including multiple songs or calls • Gorgeous illustrations for every species, showing all major plumages and geographic variants • Interactive Smart Search tool helps narrow down birds by region, color, size and/or habitat • Easily track your sightings as you go • Updated to reflect current eBird/Clements taxonomy This mobile application was developed from a collaboration between Princeton Field Guides and Birds in the Hand, LLC. Audio provided by Peter Boesman, et.al.
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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.