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
Cell Survivor - Shoot Defense
Get ready to set off on an exhilarating cell defense adventure! Your mission is not just ordinary protection, but to lead all cells to become invincible defenders, defeating those pesky enemies! Looking for some excit...
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
10,753 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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/
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 Cell Survivor - Shoot Defense: 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
Add more enemy types and level designs to enhance gameplay.
Assumption to check: Limited variety of enemies and levels
Validate with people who use this workflow before building.
Hypothesis 2
Implement a balanced ad frequency and provide ad-free premium options.
Assumption to check: Ads can be intrusive
Validate with people who use this workflow before building.
Hypothesis 3
Ensure fair game progression without heavy reliance on purchases.
Assumption to check: In-app purchases may feel necessary to progress
Validate with people who use this workflow before building.
Hypothesis 4
Introduce multiplayer modes or social sharing features to engage users.
Assumption to check: No social features for players
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
Get ready to set off on an exhilarating cell defense adventure! Your mission is not just ordinary protection, but to lead all cells to become invincible defenders, defeating those pesky enemies! Looking for some excitement? Wield your sharp blades and unleash the most precise ammunition to make your enemies tremble! In this uncharted territory, challenges are endless. Randomly generated enemy hordes, paired with mysterious underground mazes, ensure that every battle is full of surprises. Even better, every time you defeat a wave of enemies, you’re faced with three awesome ability enhancements to choose from, paving your own heroic path and creating a unique combat style. Don’t forget, defeating the big Boss comes with super surprise rewards! Go for it and take the challenge now! Use your power to whip up a medicinal storm and elevate the glory of the cell kingdom to its peak! Let the battle begin, and let your medicinal might be unleashed!
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.
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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.
