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
Viva VPN - Fast & Secure Proxy
Viva VPN – Fast & Free VPN for iPhone and iPad
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
6,548 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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Combine features and design from your favorite apps.
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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 included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Viva VPN - Fast & Secure Proxy: map the core Reference 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
Offer more diverse server options in the clone
Assumption to check: Limited server locations compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Simplify settings and add tooltips
Assumption to check: Confusing settings menu for new users
Validate with people who use this workflow before building.
Hypothesis 3
Offer an ad-free experience in the clone for premium users
Assumption to check: Frequent ads in free version
Validate with people who use this workflow before building.
Hypothesis 4
Implement better connection stability features
Assumption to check: Occasional connection drops
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
Viva VPN – Fast & Free VPN for iPhone and iPad Private, Secure, and Unlimited – Protect your privacy and enjoy internet freedom. Viva VPN is your ultimate free VPN solution for iPhone, iPad, and Apple devices. Whether you're browsing at home, using public WiFi, traveling abroad, or following global sports events like the 2026 FIFA World Cup in the USA, Canada, and Mexico, Viva VPN protects your privacy, secures your data, and helps you enjoy a fast, stable internet connection. ▪ Why Choose Viva VPN? Fast Speeds – Stream, browse, game, and follow football events with lightning-fast servers supported by multiple protocols. Global Coverage – 1000+ servers across 50+ countries with free access included, ideal for travel, sports seasons, and international internet access. Privacy First – No activity logs. Ever. Your data stays yours. One Tap to Connect – No registration, no hassle, just one tap. Unlimited Access – No time limits, bandwidth caps, or throttling. Military-Grade Security – 256-bit encryption shields your online traffic and identity. WiFi Guardian – Stay safe on any public, hotel, airport, school, or stadium WiFi network instantly. ▪ What Can You Do with Viva VPN? Stay Private – Keep your online identity safe. Follow the 2026 World Cup – Enjoy a secure and stable connection while checking football news, match schedules, scores, videos, and global sports content during the USA, Canada, and Mexico World Cup season. Game Freely – Smooth, stable gameplay for your favorite titles. Stable connection for videos, apps, sports updates, and general internet use. Secure and reliable connection for popular messaging apps. ▪ Free VPN Features Unlimited bandwidth and connection time 1000+ servers in 50+ countries Strong encryption and modern VPN protocols No login or registration required No logs policy – we never store your data ▪ Premium Upgrade (Ad-Free & Faster) Unlock blazing 10G speeds, more advanced servers, and priority support: Weekly: $5.99/week Yearly: $59.99/year ▪ Supported VPN Protocols Auto Mode (Recommended) – Smart connection with best available protocol Manual Options – Customize settings from multiple protocols ▪ Global VPN Server Locations Asia & Oceania: Japan, Singapore, South Korea, Australia, India, Taiwan, Turkey Europe: UK, Germany, France, Netherlands, Spain, Italy, Poland, Sweden, and more Americas: USA, Canada, Brazil, Mexico, Colombia, Chile Africa & Middle East: South Africa, Egypt, Israel, UAE ▪ Full iOS Privacy Protection Looking for a “free VPN iPhone” solution? Viva VPN delivers top-tier privacy and speed with no strings attached. Whether you're protecting your iOS device on school WiFi, public hotspots, travel networks, or staying connected during major football events like the 2026 FIFA World Cup, Viva VPN helps keep your connection private, secure, and stable. ▪ Subscription & Legal Auto-renewing subscriptions; cancel anytime in iOS settings. Payment charged to Apple ID account after confirmation. Privacy Policy: https://www.vivavpn.com/viva/privacy-policy Terms of Service: https://www.vivavpn.com/viva/terms-of-service Download Viva VPN now and enjoy fast, secure, and private online access for browsing, streaming, gaming, travel, and the 2026 World Cup season.
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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
Axios
React Navigation
React Native Paper
Node.js
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.
