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
Retroman: GameBoy NES Emulator
Relive the golden age of Game Boy, Game Boy Advance & NES gaming on your iPhone or iPad!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
101 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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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 Retroman: GameBoy 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
Expand library with more classic game titles.
Assumption to check: Limited game titles available for emulation
Validate with people who use this workflow before building.
Hypothesis 2
Optimize code for better performance across all devices.
Assumption to check: Inconsistent performance on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Introduce online multiplayer support for classic games.
Assumption to check: Lack of multiplayer functionality
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the purchase process and clarify benefits of premium features.
Assumption to check: In-app purchases can be confusing
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
Relive the golden age of Game Boy, Game Boy Advance & NES gaming on your iPhone or iPad! Enjoy seamless virtual controls, optimized audio rendering, and an advanced engine that delivers smooth gameplay with minimal lag for an authentic retro experience across Game Boy, Game Boy Advance & NES platforms. Retroman supports all NES mappers, Game Boy & GBA cartridge types, unlocking the entire NES and Game Boy libraries at your fingertips. FEATURES: • iCloud Sync for saved states • Bluetooth Gamepad support • Easy ROM loading for Game Boy, Game Boy Advance & NES games • High-precision virtual controls • Customizable video & audio settings • Full Game Boy, Game Boy Advance & NES emulation support • Lightning-fast emulation for smooth gameplay on both systems How to load games: 1. Browse and find legal Game Boy (.gb), Game Boy Advance (.gba) or NES (.nes) ROM files. 2. Save the ROM files to your device in the Files app. 3. Open Retroman and browse to locate the saved ROM files, then tap on the game you want to load. Alternatively, use the "Open In" feature to load ROMs directly into Retroman from other iOS apps. *** Important notices: Retroman is in no way affiliated with Nintendo or any other game console manufacturers, game developers, or publishers. The name "Nintendo" and all associated game console names are registered trademarks of Nintendo Co., Ltd. All other trademarks, logos, and copyrights are the property of their respective owners. This emulator is intended for use with games that the user legally owns. We do not condone piracy and are not responsible for any illegal use of the emulator. ***
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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
Firebase
Redux
React Navigation
Async Storage
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.
