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 - Lite Cat Free VPN ™
Cat VPN provides you with a secure and reliable network connection experience
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
1,450 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.
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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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 - Lite Cat Free VPN ™: 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
Improve connection reliability and speed through optimized server selection.
Assumption to check: VPN connection instability and slow speeds
Validate with people who use this workflow before building.
Hypothesis 2
Provide a broader selection of servers and locations without requiring a subscription.
Assumption to check: Limited free servers and locations
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the onboarding process and provide clearer guidance for first-time users.
Assumption to check: Confusing user interface for new users
Validate with people who use this workflow before building.
Hypothesis 4
Offer an ad-free experience for premium users to enhance satisfaction.
Assumption to check: In-app ads interrupt user experience
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
Cat VPN provides you with a secure and reliable network connection experience. We have carefully designed a visually appealing interface and smooth animation effects to ensure that every use is enjoyable. Key Features: • Exquisite Design - Beautiful logo and smooth animations for a top-notch visual experience • Simple Interface - Intuitive operation, one-click connection, suitable for all users • Global Nodes - Multiple country and region server selections available • Robust Security - Utilizing advanced encryption technology to protect your network privacy • Stable Connection - High-speed stable servers ensure a seamless experience Whether you are browsing the web, watching videos, or safeguarding your personal privacy, Cat VPN can meet your needs. Download now to experience a secure and convenient online world. Use of terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://fastcatvpn.xyz/p.html
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
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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.
