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
My Singing Monsters Composer
Become a Monster Maestro in My Singing Monsters Composer!
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
3,548 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 My Singing Monsters Composer: 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
Provide more diverse instruments and sound packs.
Assumption to check: Limited instrument selection may frustrate users.
Validate with people who use this workflow before building.
Hypothesis 2
Implement clearer pricing and value communication.
Assumption to check: In-app purchases could be confusing.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the UI and improve navigation flow.
Assumption to check: Some users find the interface cluttered.
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing and collaboration options.
Assumption to check: Lack of community engagement features.
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
Become a Monster Maestro in My Singing Monsters Composer! Conduct an orchestra of cute musical Monsters from the hit game My Singing Monsters! Each Monster is packed with personality and its own unique vocal, percussive, and instrumental sound. Compose your own original song using a powerful and easy-to-use music editor, or recreate your favorites! Plus enjoy Monster parts not found on My Singing Monsters' Composer Island, like dynamic Dipsters, mysterious Ethereals and lovable Seasonals. My Singing Monsters Composer is a great tool for learning musical notation in a fun and memorable way. People of all skill levels will love practicing songwriting with this simple music editor! Download My Singing Monsters Composer today - Happy Monstering! FEATURES: • 60+ charming Monsters with unique sounds • Exclusive Monsters: Ethereals, Seasonals and Dipsters • New sounds for Rare Monsters • Write original music • Learn musical notation • Record and share songs with friends • Built-in keyboard • Play offline when you're on the go • No ads or in-app purchases ________ STAY TUNED: Facebook: https://www.facebook.com/MySingingMonsters Twitter: https://www.twitter.com/SingingMonsters Instagram: https://www.instagram.com/mysingingmonsters YouTube: https://www.youtube.com/mysingingmonsters HELP & SUPPORT: Get in touch with the Monster-Handlers by visiting www.bigbluebubble.com/support or contacting us in game by going to Options > Contact Support.
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
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.
