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
After Inc.
Can you rebuild civilization after a zombie apocalypse? From the creator of Plague Inc
$1.99 · In-app purchases
OVERALL US RANK
#29
Paid · all categories
REVENUE (Est)
$321K/mo
$187K - $456K
RATING
★ 4.8
16,221 ratings · Top 5%
Evidence scope: #29 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 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 After 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 guided tutorials and tooltips to simplify resource management.
Assumption to check: Complex resource management can overwhelm new players.
Validate with people who use this workflow before building.
Hypothesis 2
Add multiplayer components or social sharing options.
Assumption to check: Limited social interaction features.
Validate with people who use this workflow before building.
Hypothesis 3
Offer more meaningful in-game rewards for free to balance monetization.
Assumption to check: In-app purchases may disrupt gameplay experience.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce dynamic events or challenges to keep gameplay fresh.
Assumption to check: Repetitive gameplay mechanics can lead to boredom.
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 rebuild civilization after a zombie apocalypse? From the creator of Plague Inc. comes a unique blend of strategic simulation, survival city builder and ‘mini 4X’. Decades after the Necroa Virus ravaged humanity, a few survivors emerge. Build a settlement, explore, scavenge resources and expand as you shape your post-apocalyptic society. The world is green and beautiful but danger lurks in the ruins! After Inc. is the brand new game from the creator of ‘Plague Inc.’ - one of the most popular games ever with over 190 million players. Brilliantly executed with beautiful graphics and critically acclaimed gameplay - After Inc. is engaging and easy to learn. Build multiple settlements and gain abilities in a persistent campaign to lead humanity out of the darkness. Public Service Announcement: Unlike our other games, I’m pleased to say that After Inc. is not based on any real world situation. No need to start worrying about a real life zombie apocalypse yet… ◈◈◈ What happens after Plague Inc.? ◈◈◈ Features: ● Make difficult decisions - Are children an unaffordable luxury? Are dogs pets or a food source? Democracy or Authoritarianism? ● Explore a beautiful post-apocalyptic United Kingdom ● Exploit the ruins of the past to scavenge / harvest resources ● Expand your Settlement with housing, farms, lumberyards and much more ● Exterminate zombie infestations and defend humanity ● Uncover old technologies and research new ones ● Shape your society and provide services to keep your people happy ● Build multiple settlements in a persistent campaign and level up abilities ● Ultra realistic modelling of Zombie behaviour based on real life studies… :P ● Sophisticated narrative algorithms shaped by your decisions ● 5 unique leaders with radically different abilities ● Internet connectivity not required ● No ‘consumable microtransactions. Expansion Packs are ‘buy once, play forever’ ●Will be updated for years to come. Special sale price to celebrate the launch of the game! ◈◈◈ I’ve got lots of plans for updates! Get in touch and let me know what you want to see. James (the designer) Contact me here: www.ndemiccreations.com/en/1-support www.twitter.com/NdemicCreations
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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
Zustand
React Navigation
React Native Reanimated
Supabase
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.
