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
VPN cat: Fast Secure Unlimited
Experience the World’s Fastest VPN with VPN Cat!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
48,102 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.
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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What's included15 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 VPN cat: Fast Secure Unlimited: map the core Utilities 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 a server selection process based on real-time speed tests.
Assumption to check: Connection speed can be inconsistent
Validate with people who use this workflow before building.
Hypothesis 2
Provide advanced settings for protocol selection and connection preferences.
Assumption to check: Limited customization options for VPN settings
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the payment flow and clarify premium features.
Assumption to check: In-app purchase process can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Add a retry mechanism and clearer error messaging.
Assumption to check: Occasional connectivity issues when switching servers
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
Experience the World’s Fastest VPN with VPN Cat! Enjoy a secure, private, and ultra-fast connection on your iPhone, iPad, or Mac with just one tap. VPN Cat is designed to protect your privacy and ensure seamless online browsing. VPN Cat Key Features: - Reliable Connections: Powered by an advanced VPN protocol developed by VPN Cat, you’ll experience stable and secure connections wherever you are. Explore the internet without boundaries in just a single tap. - Privacy First: Your privacy is our top priority. With our strict zero-log policy, we don’t monitor, record, or store your VPN activity. - Free to use & Flexible Upgrades: Start with our free VPN service, perfect for light browsing. Need faster speeds? Upgrade to our premium plan for a high-speed, ultra-fast experience. What VPN Cat Can Do for You: - Safeguard your data on WiFi & mobile networks - Protect your personal information from websites and third parties - Hide your location with an IP address changer - Access global media content from almost anywhere - Conceal your IP to prevent online tracking - Ensure anonymity in your online activity - Download and share private files with ease Subscription & Auto-Renewal Details: - Purchase subscriptions directly within the app. - Payments will be charged to your Apple ID at the time of purchase. - Your subscription will renew automatically 24 hours before the current period ends unless auto-renew is disabled. - Manage subscriptions or turn off auto-renew anytime via your Apple ID account settings. Privacy Policy: https://www.vpncat.net/privacy/com.vpn.cat.html Terms of Service: https://www.vpncat.net/terms-of-service/com.vpn.cat.html Need Help? Contact us at [email protected] for assistance or to share your feedback.
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
Axios
React Navigation
React Native Paper
React Native Async Storage
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.
