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
Handheld Game - NES Emulator
High-Performance NES Engine - Relive the 8-Bit Classics!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
15 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.
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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 included18 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 Handheld Game - NES Emulator: 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
Offer a wider selection of games or allow users to upload their own.
Assumption to check: Limited game library compared to others
Validate with people who use this workflow before building.
Hypothesis 2
Optimize performance for better experience.
Assumption to check: Emulator performance issues on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Implement customizable controls for user preference.
Assumption to check: Lack of intuitive controls
Validate with people who use this workflow before building.
Hypothesis 4
Enhance save/load state functionality.
Assumption to check: Limited support for save states
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
High-Performance NES Engine - Relive the 8-Bit Classics! Reignite your passion for retro games with this premium simulation frontend dedicated to the NES (8-bit) system. Built with native iOS technologies, it delivers crisp graphics, authentic sound effects, and a fluid gaming experience. Perfectly optimized for both portrait and landscape modes on iPhone and iPad. 【CORE FEATURES】 ● 8-Way Directional Control Specifically optimized for action and shooter systems that require precise diagonal movements. The enhanced 8-way virtual D-pad ensures your inputs are accurate in every intense moment. ● Local Network Netplay The ultimate multiplayer experience! Join forces with friends over the same WiFi network. Relive the joy of cooperative gameplay without the need for additional hardware. ● Advanced Save States Never lose your progress again. Our robust state management system allows for unlimited save slots with custom naming. Easily manage and jump back into your favorite moments through a clear, organized list. ● Auto-Fire & Controller Support Equipped with customizable X and Y buttons for continuous shooting and jumping (Auto-Fire), reducing fatigue during long sessions. Fully compatible with standard MFi, PlayStation, and Xbox game controllers. 【LEGAL DISCLAIMER】 This app is a neutral simulation frontend and DOES NOT include, provide, or distribute any game files (ROMs). This app is in no way affiliated with Nintendo Co., Ltd. or its subsidiaries. The names "Nintendo", "NES", and "Famicom" are registered trademarks of their respective owners. Users are responsible for ensuring that all game resources used with this app are legally obtained and compliant with local copyright laws.
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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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BUILD KIT DIFFICULTY
Advanced
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.
