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
Lumi Master
Download now to claim an Ultimate Rainbow Lumi Egg & bonus Energy at launch!
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.8
682 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 included
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 Lumi Master: 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
Introduce unique level challenges and varied gameplay elements.
Assumption to check: Repetitive gameplay mechanics
Validate with people who use this workflow before building.
Hypothesis 2
Add social features like friend challenges and leaderboards.
Assumption to check: Limited user engagement features
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize their avatars or game environments.
Assumption to check: Lack of customization options
Validate with people who use this workflow before building.
Hypothesis 4
Implement offline play with local data sync.
Assumption to check: No offline mode
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
Download now to claim an Ultimate Rainbow Lumi Egg & bonus Energy at launch! Lumi Master is a cozy, creature-collecting adventure set in a charming hand-drawn world. Tailored for busy players, enjoy instant discovery with simple one-handed controls in 5-minute bite-sized sessions! -Catch Hundreds of Lumis for Free Explore rainforests, deserts, and volcanoes with a simple tap! Catch wild Lumis and complete your ultimate Lumi-Dex. -Train, Evolve & Bond Watch your cute companions evolve! Unlock new forms, elemental skills, and battle potential as your bond deepens. -Bite-Sized Roguelike Exploration Spend energy to trigger instant random encounters—uncover treasure, challenge Bosses, and mine rare resources in just 2 steps. -Trade to Become the Champion A true non-P2W path to glory! Auction rare Lumis and trade with players worldwide to build your dream team. -Decorate Your Haven Build a fairytale sanctuary where your Lumis can relax, play, and live alongside you. -Lightweight & Ever-Evolving 200MB Global Package: Runs smoothly on virtually any device. Weekly Minigames: Pinball, Lumi Feeding, Co-op Raids & more. Seasonal Updates: New maps weekly, with 60–80 new Lumis added every season! Follow Us Website: https://lumi.biligames.com/en Facebook: lumimasteren Discord: https://discord.gg/JF86YUP8tu X: @lumimasterEN YouTube: @LumiMaster TikTok: @lumimasteren Instagram:@lumimasteren
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
React Navigation
Zustand
react-native-reanimated
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
