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
DefleMask Mobile
The best cross-platform chiptune tracker! Now with multiplayer support!
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
42 ratings · Top 15%
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 DefleMask Mobile: map the core Music 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
Incorporate advanced editing tools and effects.
Assumption to check: Limited sound editing features compared to desktop versions
Validate with people who use this workflow before building.
Hypothesis 2
Optimize performance for smoother playback.
Assumption to check: Occasional lag during playback on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Simplify onboarding and offer guided tutorials.
Assumption to check: Confusing user interface for new users
Validate with people who use this workflow before building.
Hypothesis 4
Build a vibrant community forum and tutorial section.
Assumption to check: Limited community support and resources
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
The best cross-platform chiptune tracker! Now with multiplayer support! Produce video game music for old school game-consoles and computers! In a tracker sound is produced by adding notes in a grid divided by channels, in which special effects can be added for each channel individually. For example you can make a vibrato, portamento and arpeggios with simple commands. There are different systems to choose, from 8 bits to 16 bits consoles, or even Arcade board chips! Check the full list below: - Genesis - Master System (+FM Sound Unit) - Game Boy - PCE - NES (+VRC7, +FDS) - C64 - Arcade - Neo Geo - MSX2 You can export your song in .vgm .wav and .rom formats and get the best quality for your amazing tunes ;) Features: Modular UI with an intuitive design. Realtime emulation of the hardware. Multiplayer support! Collab live with your friends! Built in instrument editor for FM, Wavetables and more. Switch between systems on the fly, port a NES tune to Genesis! Share projects between mobile and pc versions. 16 different global effects and dedicated effects for every chip. MIDI device support. Basic view to have a global view of the song. UI modes (select between desktop and touch mode). Export to .wav, .vgm or rom. 40 beautiful skins. 64 bits support MIDI: Velocity, Pitch Bend and more MIDI mappings New emulation cores Mobile build available for iOS! And more things waiting you to explore! Do you need some help starting making chiptune music? The manual that comes with this software is your friend! Also check our community on Discord to discover other artist and feel free to ask anything you need (except the meaning of life which is clearly 42). Also Youtube have a tons of artist sharing creations every week. System requirements: DefleMask runs everywhere! PC and even we have an iOS version too. You can export that song you have been working on and edit them on the go with DefleMask mobile or finish a tune you are making on the mobile version back in your PC.
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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
Supabase
zustand
react-navigation
@react-native-reanimated
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.
