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
Modern Magic Ball
Modern Magic Ball is the ultimate decision-making tool
$0.99
PRICE
$0.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
376 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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What's included14 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 Modern Magic Ball: map the core Games 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
Offer affordable ad-free tier ($2.99)
Assumption to check: Too many intrusive ads
Validate with people who use this workflow before building.
Hypothesis 2
Cosmetic-only purchases, skill-based progression
Assumption to check: Pay-to-win mechanics
Validate with people who use this workflow before building.
Hypothesis 3
Add battery saver mode, optimize rendering
Assumption to check: Battery drain
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
Modern Magic Ball is the ultimate decision-making tool. It was built to run fast, be fun, bring people together, and be easy to use. Features: Multi-Language Support Magic Ball can respond in 12 different languages. Now everyone can get a response. Speak to Magic Ball Ask questions using only your voice, now it's a truly modern decision-making tool. Fast and Lightweight So you can have more apps on your device. Built with iOS Design Guidelines in Mind So it feels like home. Shake to Tell Future Just shake your device to use the Magic Ball. Complete Achievements Complete achievements to work your way up the ranks and become a Master Magic Baller. Customization Change the theme of the Magic Ball to a solid color, pick your own image, or pick from a great selection of included images. The app icon may also be changed to one of many different colors. Response Topics Magic Ball has many different sets of responses. They include: Classic, Modern, Rude, Songs, Fast Food Places, Stores, or Video Games! Some can even be customized to your liking. Type to Magic Ball Ask questions using your keyboard, some questions even give you a special response! Enhanced Accessibility Larger Text support, Smart Invert support, VoiceOver support, & more. Custom Response Sets Decide your own fate and create Custom Response Sets! You can add as many responses as you’d like to the app! You can also insert any of the response topics intro your custom sets. Discover New Songs Find new songs with the Songs response topic. All the songs are handpicked and new songs are added regularly. Game Controller Support Use your favorite controller to use the Magic Ball! Languages Magic Ball Can Respond In: English, Spanish, Russian, Tagalog, German, French, Portuguese, Chinese (Simplified), Romanian, Ukrainian, Dutch, Esperanto, Pig Latin, and Pirate.
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
Unity
Firebase
AdMob
RevenueCat
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.
