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 Thumpies
Thump to the rhythm and bounce to the beat with these cute, fuzzy, and kinda gross, musical monsters!
$2.99
PRICE
$2.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
1,412 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 included15 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 My Singing Monsters Thumpies: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Thump to the rhythm and bounce to the beat with these cute, fuzzy, and kinda gross, musical monsters! Full of toe-tapping mischief and off beat melodies, Thumpies is a unique rhythm-based game where you keep the beat alive by tapping in time with Thumpies as they bounce and tumble to the musical score. The original inspiration for the hit mobile game My Singing Monsters, Thumpies is now remastered and re-imagined! Keep the Beat Make the Thumpies happy by tapping in time to the rhythm and filling the Thump-o-Meter. Make a mistake, and the meter will deplete! Make Some Noise Enjoy an excellent musical score as the Thumpies drum along! Crazy Critters Meet the Thumpies, a collection of fuzzy monsters who live to bounce! Each of the Thumpies has its own unique look, each one wilder than the last! FEATURES • Full Remake of the 2010 classic • 26 Thumpies to unlock (including previously unreleased Thumpies) • 17 Levels and 83 Stages to complete • All New Achievement System - challenge yourself to Platinum each stage! • New Assist Mode - get help mastering challenging songs For more information, check out: https://www.bigbluebubble.com/home/games/thumpies/ Make sure to check out My Singing Monsters to enjoy the franchise which Thumpies started, and to collect all of the new Thumpies Costumes available!
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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
Introduce daily challenges and varied mini-games to keep players engaged.
Assumption to check: Repetitive gameplay can become boring over time
Validate with people who use this workflow before building.
Hypothesis 2
Regular updates with new monsters and features to maintain player interest.
Assumption to check: Limited monster variety reduces excitement
Validate with people who use this workflow before building.
Hypothesis 3
Offer a one-time purchase option with all features unlocked to attract more players.
Assumption to check: In-app purchase model may alienate some users
Validate with people who use this workflow before building.
Hypothesis 4
Implement a tutorial or guide to help new players understand game mechanics.
Assumption to check: Difficulty in discovering new content
Validate with people who use this workflow before building.
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
React Navigation
Zustand
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.
