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
Spider Stack
Relax, strategize, and master the ultimate card puzzle with Spider Stack, a fresh take on the timeless Spider Solitaire experience
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
165 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 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 Spider Stack: 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
Introduce daily challenges and new block types.
Assumption to check: Repetitive gameplay can become boring.
Validate with people who use this workflow before building.
Hypothesis 2
Add multiplayer modes and friend invites.
Assumption to check: Limited social features.
Validate with people who use this workflow before building.
Hypothesis 3
Implement rewarded ads and an ad-free subscription model.
Assumption to check: Ad interruptions can frustrate players.
Validate with people who use this workflow before building.
Hypothesis 4
Offer more cosmetic options and power-ups that enhance gameplay.
Assumption to check: Difficulty balancing in-app purchases.
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
Relax, strategize, and master the ultimate card puzzle with Spider Stack, a fresh take on the timeless Spider Solitaire experience. Whether you're a casual player or a true solitaire master, Spider Stack delivers smooth gameplay, satisfying challenges, and rewarding progression. Build sequences, complete runs, and stack your way to victory! A Classic Game with a Fresh Twist Spider Stack keeps everything you love about Spider Solitaire while adding modern features and rewarding progression. Arrange cards in descending order, complete full runs from King to Ace, and clear the board to win. With intuitive controls and clean visuals, Spider Stack is perfect for quick sessions or long relaxing play. Smart Gameplay & Helpful Tools Stuck on a tricky move? Spider Stack includes tools to keep the game flowing. • Smart Hints help guide your next move • Undo Moves to fix mistakes instantly • Smooth drag-and-drop controls • Clear, easy-to-read cards Enjoy a frustration-free solitaire experience that keeps you coming back. Challenges & Events Spider Stack isn’t just solitaire — it’s a journey. • Daily Challenges to test your skills • Special Events with unique goals • Earn trophies and awards • Level up your solitaire mastery Complete objectives like finishing multiple runs and earn rewards along the way. Features Players Love • Classic Spider Solitaire gameplay • Beautiful, modern card design • Daily challenges and limited-time events • Progression system with levels and rewards • Hints and undo options for smooth gameplay • Fast, responsive controls • Designed for quick play or long relaxing sessions Perfect for Every Player Whether you're new to Spider Solitaire or a longtime fan, Spider Stack offers the perfect balance of relaxation and challenge. Play anywhere, anytime — train your brain, improve your strategy, and enjoy one of the world’s most beloved card games. Download Spider Stack now and start stacking your way to victory!
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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
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Axios
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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.
