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
Family Island — Farming game
What would your life be without modern technology on the deserted island? Dive into simplicity of the primal world with the modern Stone Age family in this thrilling offline adventure game
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
416,343 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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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 included17 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 Family Island — Farming game: 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 quests and mini-games to keep engagement high
Assumption to check: Repetitive gameplay mechanics lead to boredom
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the buying process and provide clearer value propositions
Assumption to check: In-app purchases can feel overwhelming for new users
Validate with people who use this workflow before building.
Hypothesis 3
Implement friend systems or cooperative tasks to enhance social gameplay
Assumption to check: Limited social features for user interaction
Validate with people who use this workflow before building.
Hypothesis 4
Offer a premium version without ads and create a more cohesive monetization strategy
Assumption to check: Ads can be disruptive to the experience
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
What would your life be without modern technology on the deserted island? Dive into simplicity of the primal world with the modern Stone Age family in this thrilling offline adventure game. Stranded on the remote island, a family of four - Bruce, Eva and their kids - needs your guidance and help starting a new family home from scratch and navigating through various family life situations with humour. After their previous city had been destroyed by a volcanic eruption, help this family build a thriving town, all while looking for a way to reconnect with their family and beloved tribe. In this farm game, their world might seem ancient and alien without modern day technology, yet their daily family life and relationships are very relatable in today’s world. Family Island™ is a farm game full of unexpected twists and captivating adventure! FEATURES: - Enjoy your adventure to the Stone Age era! Get creative and start farming, using cool ancient technologies - In this farm game, you can unleash your inner explorer and set on a thrilling adventure to new islands - Start your own family farm on the deserted island! Grow crops and craft useful goods to trade with other characters - Customize your farm with beautiful decorations - Get to know the family better and guide them through exciting quests and life stories in this island game ____________ Follow Family Island on Facebook and Instagram for exclusive offers and bonuses! Facebook: facebook.com/familyislandgame/ Instagram: instagram.com/familyislandgame/ Terms of Service: https://static.moonactive.net/legal/terms.html?lang=en Privacy Notice: https://static.moonactive.net/legal/privacy.html?lang=en The game contains in-game purchases (including randomized items) Questions about the game? Our support is ready and waiting at: https://melsoft-games.helpshift.com/hc/en/11-family-island/ IGRS rating 13+
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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-native-reanimated
expo-router
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.
