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
iMSX2
Experience Classic MSX and MSX2 Games on your iPhone/iPad with iMSX2!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.4
10 ratings · Below Average
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 included17 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 iMSX2: 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 the library with user-uploaded games or partnerships.
Assumption to check: Limited game library compared to other emulators
Validate with people who use this workflow before building.
Hypothesis 2
Optimize performance for smoother gameplay on various devices.
Assumption to check: Inconsistent performance on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Revamp UI to be more modern and user-friendly.
Assumption to check: User interface is outdated
Validate with people who use this workflow before building.
Hypothesis 4
Implement an onboarding flow to educate users on how to use the emulator.
Assumption to check: Lack of tutorial or onboarding
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 Classic MSX and MSX2 Games on your iPhone/iPad with iMSX2! Turn your iPhone/iPad into a portable MSX2 emulator with iMSX2! Emulate classic MSX and MSX2 games in ROM, MX1, MX2, DSK or ZIP format Key Features: · Play Classic Games: Relive the nostalgia of playing your favorite MSX and MSX2 games right on your iPhone/iPad. · Run Your Cartridges: Reproduce MSX and MSX2 cartridges from ROM, MX1, MX2, DSK and ZIP files and enjoy them on your device anytime, anywhere. · Save States: Save and load game states and the configuration type easily (iCloud) · Bluetooth Compatibility: Support for Bluetooth keyboards and game controllers. · Customizable button layouts: Edit the button positions for each orientation and enjoy full compatibility with shells like GAMEBABY and PlayCase. · Choose Your ROM Type: If your rom is not loaded correctly, try to select from various ROM configurations including "Normal", "Type K", "Type K SCC", "Type ASC16", "Type ASC16 SRAM", "Type ASC8", "Type ASC8 SRAM" and "Type ASCII16-X". · Screen filters: Enjoy a more authentic and customizable retro experience with CRT and scanline filters. · Fast forward: Speed through gameplay with the new fast forward mode. · Load Your Own BASIC Programs: Run your own programs in BASIC format directly on your iPhone/iPad. · Powered by C-bios: iMSX2 is built using C-bios for the utmost accuracy and compatibility. · Custom BIOS support: Import your own BIOS files to enhance compatibility and personalize your emulation experience. · Improved Disk Support: Play more MSX disk games with improved DSK compatibility, multi-disk support, on-the-fly disk swapping, and user disks for saving data in supported games. · Auto-fire: Added switches to enable auto-fire for the A and B buttons. · Designed to be very basic: With a beautiful and user-friendly interface for both portrait and landscape orientations. · The app does not require an internet connection, contains no ads, and does not store user data. It also takes up little space. What's Next: Stay tuned for even more enhancements! Constantly working on improving iMSX2 and adding new features to provide you with the best MSX experience on iOS. LZ4 Library Copyright (c) 2011-2020, Yann Collet C-BIOS Copyright (c) 2002-2005 BouKiCHi. All rights reserved. Copyright (c) 2003 Reikan. All rights reserved. Copyright (c) 2004-2006,2008-2010 Maarten ter Huurne. All rights reserved. Copyright (c) 2004-2006,2008-2011 Albert Beevendorp. All rights reserved. Copyright (c) 2004-2005 Patrick van Arkel. All rights reserved. Copyright (c) 2004,2010-2011 Manuel Bilderbeek. All rights reserved. Copyright (c) 2004-2006 Joost Yervante Damad. All rights reserved. Copyright (c) 2004-2006 Jussi Pitkänen. All rights reserved. Copyright (c) 2004-2007 Eric Boon. All rights reserved. emu2413 Copyright (c) 2001-2019 Mitsutaka Okazaki Z80 Emulator micro MSX2+ Copyright (c) 2023 Yoji Suzuki.
Written user reviews are not shown here. Check current App Store reviews >
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
react-native-reanimated
expo-file-system
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.
