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
HappyMood - All Games Library
HappyMood – Discover Games Made for You
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.0
2,665 ratings · Top 30%
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 included16 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 HappyMood - All Games Library: map the core Reference 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
Implement personalized recommendations based on user behavior.
Assumption to check: Limited game discovery features compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Add detailed descriptions and benefits of each subscription tier.
Assumption to check: In-app purchase options are not clearly defined.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the layout and enhance the visual hierarchy.
Assumption to check: User interface can feel cluttered.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize images and reduce load times.
Assumption to check: Slow performance on older devices.
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
HappyMood – Discover Games Made for You Are you a true gamer looking for one place to explore everything about games? HappyMoods is your ultimate companion! With a huge database of games, you can easily search, discover, and enjoy all the details you need in one simple app. Explore a Massive Library HappyMood Browse through a wide range of games across different styles and categories. Whether you love action, adventure, puzzle, or strategy, HappyMods brings everything together in one place. Watch Trailers & Gameplay Before playing, get a real taste of the game! Watch trailers and gameplay videos to see exactly what the game looks like. Save Your Favorites HappyMood Build your own personalized collection of favorite games. Add the ones you love and come back to them anytime. Track Games You Like Never lose track of a game again. Follow the games you’re interested in and keep them organized in your list. Choose Your Mood Not sure what to play? Select your mood and HappyMod will recommend games that match how you feel at that moment. Fun, relaxing, scary, or exciting – there’s always a game waiting for you. Test Your Knowledge Think you know everything about games? Try our quiz and challenge yourself with fun questions to see how much of a gaming expert you are. All-in-One Gaming Experience HappyMood makes it easy for you to discover new games, keep track of your favorites, enjoy videos, and even test your knowledge. It’s everything a gamer needs – simple, clear, and always fun. With HappyMod, finding the perfect game has never been easier.
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
Axios
BUILD KIT DIFFICULTY
Intermediate
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.
