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.
Quotes from recent reviews:
$0.99 · 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 Math Fact Master: map the core Education 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 math operations compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social features for community engagement
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Static content without updates
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.
Quotes from recent reviews: • "I am a teacher. I love this app! You thought of everything and put it in simple form..." • "As a teacher & parent, I think this is the Best Math Fact App yet. It has all 4 operations and allows you to choose exactly which #'s to drill" • “I have purchased many math apps for my 3rd grader and this is the one!!! It has everything I have been looking for. " • "...This is well worth the $0.99 which is cheaper than a single pack of flashcards..." This app's core concept was to create a flexible solution that a grade school child can easily navigate and that is robust enough to grow with your child as they grow their math knowledge. Overview – • FLASHCARD mode (practice) – Allows children to practice specific number sets and operators in the proven learning style of flashcards. Watch the flashcards flip like real flashcards! • CHALLENGE mode (exam) – Lets children test what they have learned by having to type in the answer • SIMPLE and FLEXIBLE – › Simple enough for your child to set and use › Flexible - Choose ANY combination of operators and number sets • PROFILES - Add unlimited number of profiles to monitor each child's progress • PROGRESS REPORTS! - Flexible reporting allows you to filter on numerous items to see your child's progress. › EMAIL Progress Reports - Ability to send your results to teachers, parents, or whoever! (Note: An active email account must be setup on the device to use this feature.) • ADDITION, SUBTRACTION, MULTIPLICATION, DIVISION • NUMBER SETS - We designed the app to start at a beginner’s level, but the difficulty can be increased by changing the settings. When working on the number sets with the default settings you will only be adding 0-9 to the selected number set or multiplying each number set by 0-9. (with corresponding subtraction and division problems) In settings, you can change the range from 0-9, to 0-12, 0-15, or 0-20. • SETTINGS menu - › Settings are customizable for each profile. › Ability to change the range of numbers from 0-9, to 0-12, 0-15, or 0-20. › Ability to select the number of problems to work in Challenge mode › Ability to set whether missed problems are repeated › Ability to display a timer in Challenge mode • RESULTS menu – Results screen displays after completing a set: › Summary by operator and number set shows the number of items answered right and wrong › Detailed listing of any actual problems missed - Note: When the problems missed are listed, they are shown with what the correct answer should be, not with the incorrect answer typed by the user. This way the user can study the solutions and try to do better next time. › Timed results – Gauge your child's aptitude by reviewing the time to complete a number set. Encourage your child to “beat their time". **If you like "Math Fact Master", check out our fun math facts games: › Star Math › Mathopolis: Addition, Subtraction, Multiplication, and Division
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.