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
Merge Fables®
Welcome to Merge Fables, where you will explore an island full of stories!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
17,314 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Add to a Remix
Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Merge Fables®: 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 varied challenges and quests to keep players engaged.
Assumption to check: Repetitive gameplay can become monotonous.
Validate with people who use this workflow before building.
Hypothesis 2
Add multiplayer elements or social features to enhance user engagement.
Assumption to check: Limited social interaction features.
Validate with people who use this workflow before building.
Hypothesis 3
Offer a premium version to remove ads or provide ad-free gameplay options.
Assumption to check: Frequent ads can disrupt gameplay.
Validate with people who use this workflow before building.
Hypothesis 4
Implement faster rewards and progression systems to maintain user interest.
Assumption to check: Slow progression can frustrate users.
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
Welcome to Merge Fables, where you will explore an island full of stories! Merge together pieces to meet delightful characters and build the castles of your dreams! Master the art of huge matches to get the biggest rewards! Merge Fables Features: --A Mysterious World-- This magical island is full of all kinds of curious and delightful things. The more you explore, the more surprises you’ll discover! --Exciting Unique Characters-- Match and merge thousands of different pieces to meet charming fairytale characters and see how they’re adjusting to modern life! Every new character helps you get closer to building the island of your dreams. --Challenge and Strategy-- Merging is simple and fun but there’s also plenty of strategy involved! Will you merge 3 pieces to get 1 right now, or will you wait until you can get five pieces to get the bonus? The decision is yours! --Collection and Exploration-- If you are out of resources, you can mine the stones, trees, and more! If you need more space to decorate your world, clear away the mist and go hunting for treasures as you explore the island! Enjoying Merge Fables? Learn more about the game on our Facebook Fan Page! https://www.facebook.com/MergeFables/ Need help? Contact us by sending an email to [email protected] We're here to help you! Privacy Policy: https://www.microfun.com/privacy_EN.html Terms of Service: https://www.microfun.com/userAgreementEN.html
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-gesture-handler
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.
