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.
App Overview
Crosswords for Kids
"The Crossword Puzzles for Kids app is a great app to teach children the basics of solving a crossword puzzle
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
359 ratings · Top 15%
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.
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Build Kit
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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.
What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Crosswords for Kids: 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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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Introduce more diverse categories and themes.
Assumption to check: Limited puzzle categories leading to repetitive gameplay.
Validate with people who use this workflow before building.
Hypothesis 2
Add a feature for users to challenge friends.
Assumption to check: Lack of multiplayer or social features.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a hint system to assist players.
Assumption to check: No hints or help system for difficult puzzles.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance profiles with detailed progress tracking and achievements.
Assumption to check: Basic user profiles with limited statistics.
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
"The Crossword Puzzles for Kids app is a great app to teach children the basics of solving a crossword puzzle. This app would be a great tool to help build your child’s vocabulary, spelling, reading and writing skills, and more! There is even a colour-coded letter system that will help children figure out which letters go where in the puzzle." - theiphonemom.com If your kids like puzzles and you want them to learn new things and improve their lexical skills, both you and your kids will love this App. Crosswords are both educational and fun and this is a great way to develop vocabulary, spelling, reading and writing skills. The app consists of 48 crosswords with more than 300 words of different categories (including animals, food, clothes, colours and many more). "Crossword Puzzles for Kids" will be interesting for children 3-10 years old and also for everybody who is learning English as a foreign language.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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BUILD KIT DIFFICULTY
Starter
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.
