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
Retro Zoo CEO
Build and manage your dream Zoo!
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
17 ratings · Top 30%
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 included16 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 Retro Zoo CEO: 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
Expand the variety and include unique retro-themed animals.
Assumption to check: Limited variety of animal types and attractions
Validate with people who use this workflow before building.
Hypothesis 2
Introduce additional in-app purchases for customization options.
Assumption to check: Monetization could be more diverse
Validate with people who use this workflow before building.
Hypothesis 3
Add more engaging challenges or events to maintain player interest.
Assumption to check: Repetitive gameplay mechanics
Validate with people who use this workflow before building.
Hypothesis 4
Implement social sharing to compare zoos with friends.
Assumption to check: Lack of social features
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
Build and manage your dream Zoo! Build your Zoo in any way you want, populate it with animals from around the world, then manage it! MANY ANIMALS – Retro Zoo CEO is a zoo management game featuring dozens of animals from across the globe. Discover both common and rare species, bring them to your Zoo, and design perfect habitats so that they can thrive! MANAGE YOUR ZOO – Play with an in-depth simulation where every visitor has unique needs and opinions. If you do not take that into account you can be sure they will leave a nasty review online! BUILD YOUR WAY – Inspired by classic tycoon games, Retro Zoo CEO lets you freely design paths, enclosures, buildings, and decorations across a vast map. Express your creativity and build the Zoo of your dreams. THINK ABOUT CONSERVATION – Your ultimate goal is to create a Zoo that’s not only profitable but also contributes to wildlife conservation and education worldwide. Start your Zoo today and become a true Zoo CEO!
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.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
React Navigation
Zustand
React Native Gesture Handler
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.
