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 Squirrel VPN Master Proxy
VPN Squirrel is a VPN with many free and VIP countries.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.3
2,030 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 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 Squirrel VPN Master Proxy: map the core Productivity 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 better connection stability checks and automatic reconnection.
Assumption to check: Frequent connection drops
Validate with people who use this workflow before building.
Hypothesis 2
Expand server list to include more countries and regions.
Assumption to check: Limited server locations
Validate with people who use this workflow before building.
Hypothesis 3
Redesign settings UI for better user understanding.
Assumption to check: Confusing settings layout
Validate with people who use this workflow before building.
Hypothesis 4
Integrate a live chat feature for quicker user assistance.
Assumption to check: Slow customer support
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
VPN Squirrel is a VPN with many free and VIP countries. Protect your online privacy! Benefits of VPN Squirrel: • Provides access to social networks • Change of location - vpn location changer feature • Huge number of servers - more than 1,000 VPN servers are assigned to each country from the list • Our VPN hides your real IP • Secure VPN connection with data encryption • We do not store logs of your activities on the Internet • VPN is available for free in many countries and over 1,000 servers • No time limit and no VPN traffic Available countries with VPN: • USA • Moldova • Romania • The Netherlands • France • Spain • Germany • Hungary • Poland • Luxembourg • Ukraine • Kazakhstan • Great Britain • Russia And many other VPN locations VPN Free? We have many countries for you. Choose any. Want a premium VPN? There is also. Choose any country and enjoy premium VPN with high speed and connection reliability. VPN for iPhone is easy to use: choose a VPN country to connect to and enjoy VPN connection. Want to keep your online activities private and secure? Consider downloading VPN Squirrel, the top rated VPN app in the App Store! Our app uses advanced VPN technology to encrypt your internet connection and protect your data from prying eyes. When you use VPN Squirrel, your internet traffic is routed through our secure VPN servers, which act as an intermediary between your device and the websites you visit. This means your IP address is hidden and your online activities are protected from hackers, advertisers, and even your ISP. With Squirrel VPN, you can be sure that your online activities are always protected, no matter where you go or what network you use. Our app is easy to use and offers lightning-fast speeds, unlimited bandwidth, and a strict no-logs policy, ensuring your privacy is always respected. VPN gives you freedom and a sense of celebration. VPN Privacy Policy: https://sites.google.com/view/vpn-squirrel/privacy VPN rules: https://sites.google.com/view/vpn-squirrel/terms
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
Axios
React Navigation
React Native Elements
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.
