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
ArcEmu
ArcEmu is the first emulator for Apple Watch.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
1,243 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/
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 ArcEmu: 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
Expand game selection and customization options.
Assumption to check: Limited emulator options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Simplify subscriptions and provide clear explanations.
Assumption to check: In-app purchase system can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI/UX design for better navigation.
Assumption to check: User interface can feel cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Implement onboarding tutorials to guide first-time users.
Assumption to check: Lack of tutorial for new users
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
ArcEmu is the first emulator for Apple Watch. It also works on iPhone, iPad and Apple TV, providing a comprehensive gaming experience across all your Apple devices. Consoles Supported - Game Boy (.gb) - Game Boy Color (.gbc) - Game Boy Advance (.gba) Main Features - Precise and fast emulation thanks to mGBA core - Game Link Cable support (Online Multiplayer for up to 4 players) * - Cheat support with a preloaded database of popular codes ** - Frame independent emulation with 30 or 60 fps - All orientations support on iPhone and iPad - Precise and well-designed on-screen controls - Customizable controls (transparency and position) on iPhone and iPad - 8-directional or 4-directional D-Pad on iPhone and iPad - Fast-Forward (2x, 4x and Max) - Slow-mo (0.5x) - Color Palette modification for GB games - Button hold/sustain feature - Accelerometer support - Gyroscope support on iPhone and iPad, using the Digital Crown on Apple Watch - Rumble support on iPhone - Digital Crown support on Apple Watch - Game controllers support on iPhone, iPad and Apple TV - Zip file support - Auto-Save feature - Save State sharing between devices - iCloud support for ROMs and Save States - ROM sharing via iCloud with share codes - Family Setup support (standalone Apple Watch) Compatibility - Apple Watch Series 3 or later - Apple Watch SE or later - Apple Watch Ultra or later ArcEmu does not include any games or ROMs. You can import Game Boy ROMs directly from your iPhone and store them in iCloud. Your Apple Watch will download them directly from iCloud. On standalone Apple Watch (Family Setup), ROMs can be downloaded from iCloud using share codes. The games shown in the screenshots are: - Acorn Grove: https://gibbongl.itch.io/acorn-grove - Anguna: https://gauauu.itch.io/anguna - Hauntsfield: https://alliemackie.itch.io/hauntsfield - µCity Advance: https://skylyrac.itch.io/ucity-advance * Requires a Game Center account ** Cheats may cause unexpected behavior or affect game stability and save data ArcEmu is in no way affiliated with Nintendo. The name "Nintendo" and all associated game console names are registered trademarks of Nintendo Co., Ltd.
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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
Zustand
Supabase
React Navigation
React Native Gesture Handler
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.
