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
Chess.com - Play and Learn
Play chess lessons online with over 280 million players from around the world!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
869,535 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 included20 files
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 Chess.com - Play and Learn: 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
Play chess lessons online with over 280 million players from around the world! Chess is known as the best strategy board game in the world! Enjoy unlimited 3D offline pocket chess games and improve your chess rating with 1,000,000+ puzzles, more than 20 million chess games a day, lessons, and over 100 powerful bot opponents. Unlock your inner chess master today! PLAY CHESS ONLINE: - 2 Player online chess mode is entirely free to enjoy with your friends. - Join tournaments with players online or friends and become a master. - Play games in real-time from one minute per game to 30 minutes or longer with friends. - Review your strategy and game lessons and lay out daily correspondence in online chess. - Play exciting chess variants in our app: chess960 (Fischer-Random), blitz chess, puzzle rush, bullet chess, puzzle battle, or blindfold. CHESS PUZZLES: - Enjoy 1,000,000 + unique puzzles. - Rated mode automatically adjusts to your skill level to help you improve. - Race the clock with a timer to beat your high score in Puzzle Rush. - Practice puzzles with specific themes in this strategy board game (checkmate in 1, in 2, in 3, blindfold, endgames, fork, skewer, sacrifice, timer, etc.) CHESS LESSONS: - Hundreds of quality chess lessons and online videos made by masters (Learn and practice your skills with chess problems) - Interactive puzzles tutorials with tips and game recommendations. - Learn all the chess rules and strategies in a step-by-step lesson plan (opening, endgame...) CHESS COACHING: - Learn from helpful and immersive visual chess coach lessons. - Review your games with the coach and learn the strategy of the board game for every move. - Play games with the coach, who will guide you through the fundamentals move by move and provide helpful hints as you play. PLAY CHESS ONLINE AGAINST THE COMPUTER: - Choose the level of computer opponent you want to play and set a timer. - Analyze your chess games offline and learn to see where you went wrong and how you can improve. CHESS COMMUNITY: - Join a community of more than 200M online chess players. Find friends! - More than 20M games played each day. - Compete to get your own rating and try to join the best player online chess leaderboards against other players. - Watch the most popular superstars: Hikaru, GothamChess, or Magnus! ... and MUCH MORE: - Play chess games offline against the computer and the clock with a timer. - Articles by the best coaches and masters. - Explore openings like Queen´s Gambit or Sicilian Defense. - Challenge and play with your friends in an online chess game. - Choose from 20+ board themes and 3D pieces. - Get in-depth performance stats about your games, puzzles, and lessons. Playing pocket chess online has never been so easy! Chess.com is the place to play chess games online with your friends and other players! Share your suggestions and comments. Our support team is happy to help you 24 hours a day, 365 days a year! ABOUT CHESS.COM: Chess.com was created by chess players and people who love chess! Team: http://www.chess.com/about
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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
Integrate a robust friend system with invites and chat.
Assumption to check: Limited social features for connecting with friends
Validate with people who use this workflow before building.
Hypothesis 2
Implement a matchmaking system based on player ratings.
Assumption to check: Difficulty in finding opponents with similar skill levels
Validate with people who use this workflow before building.
Hypothesis 3
Offer an ad-free experience as a premium feature.
Assumption to check: Ads can interrupt the gameplay experience
Validate with people who use this workflow before building.
Hypothesis 4
Enhance learning resources with interactive tutorials and quizzes.
Assumption to check: Limited tutorial content for beginners
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
Redux
react-native-chessboard
react-query
BUILD KIT DIFFICULTY
Expert
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.
