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
Crossword Challenge
Crossword Challenge is the ultimate brain-training crossword game that keeps your mind sharp and your spirit competitive! Solve beautiful picture clues, enjoy smooth modern gameplay, and embark on a journey of daily m...
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
14,009 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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.
JavaScript is required to complete mailbox verification.
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 Crossword Challenge: map the core Games workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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
Implement a wider range of puzzles and adjustable difficulty settings.
Assumption to check: Limited puzzle variety and difficulty levels
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the purchase process and offer clearer descriptions of benefits.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the hint feature for better reliability and user feedback.
Assumption to check: Occasional bugs in hint system
Validate with people who use this workflow before building.
Hypothesis 4
Introduce an option for a premium ad-free experience.
Assumption to check: Ads can interrupt gameplay
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
Crossword Challenge is the ultimate brain-training crossword game that keeps your mind sharp and your spirit competitive! Solve beautiful picture clues, enjoy smooth modern gameplay, and embark on a journey of daily mental exercise. Whether you’re a seasoned word solver or a casual puzzle fan, Crossword Challenge will quickly become your new daily ritual! Train your brain every day with fun and relaxing crosswords. Stretch your vocabulary, improve your logic skills, and keep your mind young with every puzzle you complete! Dark Mode Support lets you play comfortably at any time, day or night. Picture Clues add a fresh twist to the classic crossword experience, making each puzzle even more exciting and fun to solve. Daily Mini Levels with City Badge Rewards give you quick, rewarding challenges every day. Collect them all and showcase your achievements! Weekly Tournaments invite you to compete with players around the world. Climb the leaderboard and prove you’re a true Crossword Champion! With smooth graphics, intuitive controls, and countless word puzzles to explore, Crossword Challenge is perfect for anyone who loves to train their mind while having fun. Download now and start your daily brain workout with Crossword Challenge! Features: Brain-training crossword puzzles for all skill levels Modern design with Dark Mode support Unique picture clues for a fresh and fun twist Daily mini levels with collectible city badges Weekly tournaments and global leaderboards Hints to help when you're stuck No timers — play at your own pace Auto-save to pick up right where you left off Ready to sharpen your mind and have fun doing it? Join Crossword Challenge today!
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
react-navigation
redux-toolkit
react-native-gesture-handler
BUILD KIT DIFFICULTY
Intermediate
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.
