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
eNES: NES & SNES Retro Emu
Experience the nostalgia of classic NES gaming with eNES, the lightweight retro emulator for iOS
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
181 ratings · Top 30%
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 eNES: NES & SNES Retro Emu: map the core Developer Tools 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 a community feature for ROM sharing.
Assumption to check: Limited game library compared to other emulators
Validate with people who use this workflow before building.
Hypothesis 2
Redesign UI to be more modern and engaging.
Assumption to check: User interface may feel outdated
Validate with people who use this workflow before building.
Hypothesis 3
Optimize emulator performance for better gameplay.
Assumption to check: Performance issues with larger ROMs
Validate with people who use this workflow before building.
Hypothesis 4
Introduce cloud saves for user progress and preferences.
Assumption to check: Lack of cloud save functionality
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
Experience the nostalgia of classic NES gaming with eNES, the lightweight retro emulator for iOS. Weighing less than 5MB, eNES packs a punch with its optimized performance and feature-rich interface. Key Features: -Automatic saving: Never lose your progress with automatic saving. -Auto-load last save: Pick up right where you left off with auto-loading of the last save. -Haptic vibration: Enhance your gaming experience with touch vibration feedback. -2 External controller compatibility: Seamlessly connect external controllers for enhanced gameplay. -On-screen controller skin: Customize the on-screen controller's opacity and visibility to suit your preferences. -Audio filtering and sampling selection: Fine-tune your audio experience with filtering and sampling options. -Scanline visualization: Immerse yourself in the retro aesthetic with scanline visualization. -Automatic .nes file opening and importing: Effortlessly open and import .nes files for quick gaming sessions. -Battery optimization: Enjoy extended gameplay sessions with minimal battery consumption. Rediscover the joy of classic NES gaming on your iOS device with eNES. Download now and relive the golden age of gaming! Terms & Condition https://gist.githubusercontent.com/mattiaa95/a9624bdaa9742350da2f60ab2957823c/raw/4968b429a06fda4917e2c3903c8e415d5a12d12a/Term&Condition.md Privacy Policy https://gist.githubusercontent.com/mattiaa95/43f479d4da16a7bb4aaf5504874b01bb/raw/d25d0afa3cf5a33d08e396fbadae1e9f04651b53/GeneralPrivacyPolicy.md
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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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Expo
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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.
