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
Plague Inc.
Can you infect the world? Plague Inc
$0.99 · In-app purchases
OVERALL US RANK
#7
Paid · all categories
REVENUE (Est)
$1.1M/mo
$641K - $1.5M
RATING
★ 4.8
167,058 ratings · Top 5%
Evidence scope: #7 is the current overall US Paid chart position. 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 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 Plague Inc.: 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
Implement dynamic challenges and randomized events to keep gameplay fresh.
Assumption to check: Many users find the game repetitive after a few plays.
Validate with people who use this workflow before building.
Hypothesis 2
Include a tutorial or help section for better onboarding.
Assumption to check: Some users experience difficulty understanding game mechanics.
Validate with people who use this workflow before building.
Hypothesis 3
Offer clear value for purchases and include fair pricing for premium content.
Assumption to check: In-app purchases can be seen as predatory.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce multiplayer modes or leaderboards for competitive play.
Assumption to check: Limited interaction with other 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
Can you infect the world? Plague Inc. is a unique mix of high strategy and terrifyingly realistic simulation. Your pathogen has just infected 'Patient Zero'. Now you must bring about the end of human history by evolving a deadly, global Plague whilst adapting against everything humanity can do to defend itself. Brilliantly executed with innovative gameplay and built from the ground up for iPhone & iPad, Plague Inc. evolves the strategy genre and pushes mobile gaming (and you) to new levels. It’s You vs. the world - only the strongest can survive! ◈◈◈ #1 top game globally with well over a billion games played ◈◈◈ Plague Inc. is a global hit with over a million 5 star ratings and features in newspapers such as The Economist, New York Post, Boston Herald, The Guardian and London Metro! The developer of Plague Inc. was invited to speak at the CDC in Atlanta about the disease models inside the game! ▶ “The game creates a compelling world that engages the public on serious public health topics” – The Centers for Disease Control and Prevention ▶ "Plague Inc: The Cure encapsulates the complexities of a global pandemic response and highlights how crucial international collaboration is needed to address such a threat.” – Coalition for Epidemic Preparedness Innovations ▶ “Best Tablet Game” - New York Daily News ▶ “Plague Inc. will snag your attention in all the right ways and keep it there” - Touch Arcade ▶ “No denying Plague Inc.'s high-level of quality” - Modojo ▶ “Plague Inc. should not be as much fun as it is” – London Metro ▶ “Will leave you hoping to destroy the world, all in the name of a bit of fun” – Pocket Lint ▶ “Plague Inc.'s gameplay is infectious” - Slide to Play ▶ Winner – “Overall Game of the Year” – Pocket Gamer ▶ “Killing billions has never been so fun” – IGN ◈◈◈ Features: ● Stunning retina graphics with a highly polished interface (Contagion guaranteed) ● Highly detailed, hyper-realistic world with advanced AI (Outbreak management) ● Comprehensive in-game help and tutorial system (I am Legendarily helpful) ● 12 different disease types with radically different strategies to master (12 Monkeys?) ● Full Save/Load functionality (28 Saves Later!) ● 50+ countries to infect, hundreds of traits to evolve and thousands of world events to adapt to (Pandemic evolved) ● Full game support for scoreboards and achievements ● Expansion updates add the mind controlling Neurax Worm, the zombie producing Necroa Virus, Speed Runs and real life Scenarios! ● Can you save the world? Take control and stop a deadly global plague in our biggest expansion yet! ● Take on Daily Diseases, earn powerful upgrades and compete against the world in Outbreak Mode! Localised in English, German, Spanish, Brazilian Portuguese, Italian, French, Japanese, Korean, Simplified Chinese, Traditional Chinese and Russian. (more coming soon) P.S. Give yourself a pat on the back if you got all the themed literature references! Special sale price to celebrate being one of the most popular paid iPhone games ever! ◈◈◈ Like Plague Inc. on Facebook: http://www.facebook.com/PlagueInc Follow me on Twitter: www.twitter.com/NdemicCreations
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.
