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
X-Clash: Survival Challenge
X-Clash is a cute-style post-apocalyptic survival game.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
38,948 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 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/
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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 X-Clash: Survival Challenge: 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
X-Clash is a cute-style post-apocalyptic survival game. The Evil Void tears the continent asunder, while the Undead Plague devours the last remnants of civilization! In this dual apocalypse, only the worthy shall rebuild the realm! To survive this cataclysm, you must master both strategic command and survival instinct! X-Clash offers the following advice to all survivors: True power lies not in brute strength, but in forging unbreakable bonds with your companions. Assemble your fellowship wisely - their lineage holds the key to victory. Highlighted Features: - Brand new level experience with multiple choices - Play One-Handed to dominate the continent! - Unveil the mysteries and experience various strategic gameplays - Collect and match, unravel the mysteries of the void - Strengthen your power, and form alliances with others to receive the greatest support!
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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 modes and challenges to keep players engaged.
Assumption to check: Limited game modes and variety
Validate with people who use this workflow before building.
Hypothesis 2
Ensure fair play by limiting pay-to-win aspects.
Assumption to check: In-app purchase imbalance
Validate with people who use this workflow before building.
Hypothesis 3
Add more unique mechanics and dynamic events.
Assumption to check: Repetitive gameplay
Validate with people who use this workflow before building.
Hypothesis 4
Invest in better server infrastructure to handle traffic.
Assumption to check: Low server stability during peak times
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
react-navigation
@supabase/supabase-js
react-native-reanimated
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.
