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
CookieRun: Kingdom
■ EVERYONE'S FAVORITE TINY HEROES: THE COOKIES
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
352,648 ratings · Top 15%
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 CookieRun: Kingdom: 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
Allow users to customize Cookie appearances and abilities more freely.
Assumption to check: Limited character customization options
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more subtle approach to in-app purchases, perhaps with a rewards system.
Assumption to check: In-app purchase prompts can be intrusive
Validate with people who use this workflow before building.
Hypothesis 3
Introduce varied challenges and events to keep gameplay fresh.
Assumption to check: Repetitive gameplay can cause boredom
Validate with people who use this workflow before building.
Hypothesis 4
Offer more offline play options or modes.
Assumption to check: Network dependency for gameplay
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
■ EVERYONE'S FAVORITE TINY HEROES: THE COOKIES Meet our Cookies, all voiced by an amazing cast of voice actors Witness their epic skills, fall in love with their voices, and dress them into new chic costumes. Join the Cookies in CookieRun: Kingdom! ■ EMBARK ON AN EPIC JOURNEY AROUND EARTHBREAD The secrets of the ancient Cookies and their kingdoms are waiting to be unraveled. Join GingerBrave and his friends against Dark Enchantress Cookie and her dark legion. The chronicles of CookieRun: Kingdom have just begun! ■ BUILD A DELICIOUSLY SWEET KINGDOM Choose from a great variety of unique decors to design the Kingdom of your dreams. Produce materials, craft items, arrange all sorts of activities—the vibrant kingdom life awaits! ■ BATTLE YOUR WAY TO VICTORY Create the ultimate Cookie team with endless combinations of Treasures and Toppings Prove your battle skill in the Kingdom Arena, Cookie Alliance, Super Mayhem, and Guild Battles! Come up with different strategies to emerge victorious! ■ BRING GLORY TO YOUR GUILD Reach the top of the ranking table with your fellow guildmates. Expand your guild's Domain and collect Guild Relics to become the strongest guild there is! [Retainment of your service usage records] Purpose: management of deleted accounts, prevention of service abuse and legal claims Retainment period: one month following account deletion [How to delete your account] Open the game Tap the 三-shaped button in the upper-right corner of the screen Tap Settings Tap Info Tap Delete Account in the bottom part of the screen [Required Access Permissions] - None [Optional Access Permissions] - Notifications: grants permission to receive game-related notifications, such as events and special offers. * You can still play the game without granting optional permissions. * However, some features may be limited or unavailable if optional permissions are not granted. [How to deactivate access permissions] - Settings > Apps > CookieRun: Kingdom > Deactivate Notifications ※ If you are using a guest account, deleting the app will permanently erase your in-game data. ※ Access permissions may vary depending on your device or app version. Please forward all other questions to our support team Contact email: [email protected]
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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
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@supabase/supabase-js
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.
