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
Solitaire by MobilityWare
we’ve made some incredible new features for solitaire:
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
134,559 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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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 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.
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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 Solitaire by MobilityWare: 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
Implement better touch controls and feedback for dragging.
Assumption to check: Some users report issues with card dragging responsiveness.
Validate with people who use this workflow before building.
Hypothesis 2
Offer a more user-friendly premium option to remove ads.
Assumption to check: Ads can be intrusive during gameplay.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize card backs and colors.
Assumption to check: Limited customization options for card designs.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance app stability with better error handling and testing.
Assumption to check: Occasional crashes during 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
we’ve made some incredible new features for solitaire: daily challenge calendar themes each month of the year has a unique theme to spotlight. take a look at your daily challenge calendar for a fun new theme each month! modern card faces solitaire has a fresh card face style, without sacrificing the classic look and features that our fans enjoy! this solitaire game features daily challenges. each day you’ll receive a unique daily challenge. solve the daily challenge and receive a crown for that day. earn trophies each month by winning more crowns! your daily challenges, crowns, and current trophy status are available to view any time how great are your solitaire skills? with leaderboards, you can compete for the best solitaire score against players all around the world. solitaire is a universal app, playable in the highest quality available for each apple device. = features = • ad-free gameplay • daily challenges • themed card backs and backgrounds • multiplayer solitaire • "show me how to win" for difficult deals • leaderboards • draw 1 and draw 3 cards • portrait and landscape orientations • customized card backs and backgrounds • achievements • right or left handed play • unlimited undo • auto complete to finish game • standard and vegas scoring • statistics the addicting game you’ve been playing on your computer for years now goes wherever you go. download solitaire today! like us on facebook http://www.facebook.com/mobilitywaresolitaire for the latest info and what we are up to, check out http://www.mobilityware.com/ created and supported by mobilityware
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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
Supabase
Zustand
react-native-gesture-handler
expo-router
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.
