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 - Super Unlimited Proxy
FREE VPN FEATURES
Free · In-app purchases
OVERALL US RANK
#85
Free · all categories
REVENUE (Est)
$82K/mo
$45K - $120K
RATING
★ 4.6
2,108,788 ratings · Top 15%
Evidence scope: #85 is the current overall US Free chart position. 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included19 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 VPN - Super Unlimited 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 server optimization and load balancing.
Assumption to check: Connection speed varies greatly.
Validate with people who use this workflow before building.
Hypothesis 2
Offer more functionality in the free tier to attract users.
Assumption to check: Limited free features.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify subscription options and provide clearer user guidance.
Assumption to check: Complex subscription management.
Validate with people who use this workflow before building.
Hypothesis 4
Reduce ad frequency or offer an ad-free experience for a one-time payment.
Assumption to check: Frequent ads in the free version.
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
FREE VPN FEATURES Experience the best free VPN: no ad interruptions and limits - Unlimited speed, bandwidth, and time at no cost - Access content from 40+ server locations (20+ US cities) - Fast VPN: 5,000+ servers dedicated to free users - No Activity Logs - Military-grade encryption - Optimized for iOS devices with 16.0+ (iPhone, iPad, Mac, Apple Vision) - No registration needed First time users get a 7-day free trial to our monthly and yearly plans. WHAT IS A VPN? VPNs create an encrypted tunnel for your data and protect your online identity by hiding your IP address. VPNs can help you - secure your connection on public WiFi - such as in school, at work, or traveling - protect your privacy from your Internet Service Provider or at work - access messaging services (e.g., WhatsApp, Telegram, Messenger, Discord) - access social media (e.g., Instagram, Tik Tok, Facebook, Snap, Twitter, X, Reddit - access streaming services (e.g., Netflix, HBO, Hulu, YouTube) - access mobile games (e.g., Plato, Honor of Kings, Genshin Impact, Pokémon GO, Rise of Kingdoms, Clash of Kings, PUBG Mobile, Call of Duty: Mobile, Fortnite, Minecraft, Mobile Legends: Bang Bang, Free Fire, Roblox, ) VPN PROTOCOLS - We offer up to 4 VPN protocols for free users (depending on location) - Users are recommended to select “Auto” and our VPN will choose the best protocol for you - We support OpenVPN, IKEv2, Super, and V2Ray (new protocol) VPN SERVER LOCATIONS WORLDWIDE Choose from over 5,000+ servers across 55+ countries, including: - North America: USA (40+ cities), Canada (3 cities), Mexico - Europe: Austria, Belgium, Bulgaria, Switzerland, Czechia, Germany, Denmark, Estonia, Spain, Finland, France, United Kingdom (3 cities), Greece, Croatia, Hungary, Ireland, Iceland, Italy, Lithuania, Luxembourg, Latvia, Moldova, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Russian Federation, Slovakia, Sweden, Ukraine - Asia: Australia, Malaysia, Singapore, South Korea, Japan, Hong Kong, Indonesia, India, Israel, Kazakhstan, Taiwan, Vietnam, Turkey, Philippines - South America: Brazil, Chile, Colombia, Peru - Africa: Egypt, South Africa PREMIUM VPN FEATURES - Ultra fast 10Gbps servers - No ads - Servers in 55+ countries - 40+ US city-level servers - City-level servers in Canada and the UK - Premium users can protect up to 10 devices PREMIUM PLANS (no ads, 10G servers, and more): Weekly: $9.99/week Monthly: $11.99/month (7-day free trial) Yearly: $79.99/year (7-day free trial) PRIVACY COMMITMENT VPN - Super Unlimited Proxy is committed to privacy with zero activity logs. We don't collect or retain any information that could compromise your online security. Links to our Terms of Service and Privacy Notice can be found below: - Privacy Notice: https://www.vpnsuper.com/privacy-notice - Terms of Use: https://www.vpnsuper.com/terms-of-service Download the top free iPhone VPN to: - jump through gaming levels faster than you can say biubiu - express yourself on social media - browse the internet faster than a proton - shield yourself on hotspots - turbo charge your tunneling - break the filters with our proxy master - hide your internet activity better than an ostrich - vpnify your connection
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.
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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.
