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
Spin4Fun
Turn mundane decisions into fun! With Spin4Fun, you can gamify your life and inject a dose of playful spontaneity into everything you do.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 ratings · Top 5%
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
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A product spec, screen plans, and build steps for your coding agent.
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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/
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.
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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 Spin4Fun: map the core Entertainment 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 new prizes regularly and seasonal events.
Assumption to check: Limited prize variety can make the game repetitive.
Validate with people who use this workflow before building.
Hypothesis 2
Add randomized elements to the spin for surprise outcomes.
Assumption to check: Users may find the spinning mechanism predictable after a few spins.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the purchase flow and explain benefits clearly.
Assumption to check: In-app purchase options may confuse users.
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate sharing options to allow users to share spins on social media.
Assumption to check: Lack of social sharing features limits engagement.
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
Turn mundane decisions into fun! With Spin4Fun, you can gamify your life and inject a dose of playful spontaneity into everything you do. - Dinner dilemmas vanish! Spin the wheel and let fate decide tonight's culinary adventure. - Workout routines become a blast! Spin for your next exercise and conquer your fitness goals with a smile. - Chores? No problem! Turn them into a fun game for the kids, making responsibilities feel like rewards. - Game night leveled up! Create custom trivia wheels or add a twist to your favorite board games. Spin4Fun features: - Create unlimited wheels: Design as many personalized wheels as your imagination can dream of. - Customize the wheel: Up to 12 wedges per wheel. - 17 vibrant colors: Make your wheels visually stunning and uniquely yours. - Flexibility without limits: Even blank wedges are possible. Spin4Fun isn't just an app; it's a gateway to a more engaging and enjoyable life. It's the perfect tool for: - Families looking to add fun to daily routines. - Educators seeking creative ways to engage students. - Game enthusiasts wanting to customize their play. - Anyone who wants to break free from the ordinary!
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.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
Axios
React Navigation
React Native Reanimated
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.
