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
The Seven Deadly Sins
Beyond epic - the ultimate massive-scale RPG
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
144,645 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 included18 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 The Seven Deadly Sins: 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 diverse quests and events to keep gameplay fresh.
Assumption to check: Repetitive gameplay can lead to user fatigue.
Validate with people who use this workflow before building.
Hypothesis 2
Offer more free rewards and balanced monetization.
Assumption to check: In-app purchases can be aggressive and affect user experience.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a tutorial system to help new users navigate character collection.
Assumption to check: Character collection can feel overwhelming without guidance.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize load times with better asset management and caching.
Assumption to check: Loading times can be long during battles.
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
Beyond epic - the ultimate massive-scale RPG [The Seven Deadly Sins: Grand Cross]! The stunning anime game that fascinated the world! Experience the original anime and all of its memorable battles! ◆The Seven Deadly Sins: Grand Cross Overview◆ ▶ 6 years of adventure enjoyed by players, anime fans, and manga fans alike! Over 77 million downloads worldwide! Use events to power up fast and compete with the best! Download [The Seven Deadly Sins: Grand Cross] now! ▶ A strategic skill card battle system! Line up skills of the same rank to combine them for a stronger card! Unleash your best skills and finish the fight with an Ultimate Move! Enjoy thrilling battles that raise the stakes with each turn! ▶ Maximum strategy, maximum fun! Work together with friends in real time to clear Death Matches! Defeat Demonic Beasts that get stronger with each floor in Demonic Beast Battles! Strategize to use the right skills at the right time in Demon King Battles! ▶ Sport game-exclusive looks! Tons of original outfits can only be found in the game! Give the heroes of [The Seven Deadly Sins] a new look, your way! ▶ Experience [The Seven Deadly Sins] story and beyond! Britannia comes to life in this faithful recreation. Journey through the epic tale of [The Seven Deadly Sins], featuring the original story with stunning 3D visuals. Plus, you can enjoy new, game-exclusive stories, too! ▶[Four Knights of the Apocalypse] Story Added The sequel set 16 years after the end of [The Seven Deadly Sins]! Join Percival and the prophesied [Four Knights of the Apocalypse] in The Seven Deadly Sins: Grand Cross! ※ Recommended Specs: - iOS 15.0 or higher - RAM: 2GB or higher ※ This app offers in-app purchases. You can disable this feature by adjusting your device’s settings. By downloading this game, you are agreeing to our Terms of Service and Privacy Policy. - Terms of Use: http://help.netmarble.com/policy/terms_of_service.asp - Privacy Policy: http://help.netmarble.com/policy/privacy_policy.asp ※ Optional access CAMERA - Allows the camera for AR function to take pictures with AR characters. PHOTO - Allows the application to read from the external storage.
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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
React Navigation
Axios
React Native Reanimated
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.
