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.
For more than a century, Black’s Law Dictionary® has been the gold standard for the language of law
$54.99 · 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 Black’s Law Dictionary 10th Ed: 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 content updates and definitions
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface is not user-friendly
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Slow search functionality
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: High price point with limited 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.
For more than a century, Black’s Law Dictionary® has been the gold standard for the language of law. Today, it’s the most widely cited law book in the world. By Editor in Chief Bryan A. Garner, the 10th Edition is the most comprehensive law dictionary ever published. It contains more than 50,000 terms, including more than 16,000 new definitions. Features • More than 50,000 terms, including 7,500 more terms than the 9th Edition • More than twice as many sources quoted and cited than the 9th Edition • Earliest usage dates in English-language contexts provided for nearly all terms – the only legal dictionary with this feature • More than 1,000 definitions of law-related abbreviations and acronyms • Trusted authority – every term has been reviewed for accuracy by nearly 300 attorneys from across the country • Pronunciation guidance, including audio pronunciations for over 7,000 terms • Thoroughly reviewed and edited Latin maxims, with 900 new maxims added New in the 10th Edition • “Did You Mean” search functionality o spell checker functionality provides alternative suggestions for misspelled search terms • Define in Black’s o define words within definition text by selecting a word and tapping Define in Black’s • Enhanced linking o link to subentries and cross-references from a search result, within a definition, and between definitions o link to Westlaw® content via the WestlawNext® iPad® app • Word of the Day o audio pronunciation available on all Word of the Day entries o link to full definition from Word of the Day tab o history slider on Word of the Day tab provides quick navigation to previous Word of the Day entries • History o track viewed definitions and sort by date or alphabetical order • Intuitive structure, formatted for easy reading and navigation
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.