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
Fast VPN - Private & Secure
Why choose Fast VPN: Private & Secure?
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
441 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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
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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 included18 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 Fast VPN - Private & Secure: 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 more stable connection protocols.
Assumption to check: User connection drops frequently
Validate with people who use this workflow before building.
Hypothesis 2
Expand server options for better performance.
Assumption to check: Limited server locations
Validate with people who use this workflow before building.
Hypothesis 3
Integrate in-app support and chat features.
Assumption to check: Slow customer support
Validate with people who use this workflow before building.
Hypothesis 4
Simplify pricing and provide clearer trial information.
Assumption to check: Confusing subscription model
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
Why choose Fast VPN: Private & Secure? Super-fast VPN with a Global Network Our global, rapid VPN network spans across continents, with super-fast VPN servers located in every corner of the globe. Enjoy blazing speed and stability in the USA, Indonesia, Malaysia, Philippines, Australia, Brazil, Thailand, Canada, Saudi Arabia, Colombia, France, Israel, Italy, Japan, Russia, Spain, Turkey, Ukraine, UAE, UK and many more countries. This facilitates a protected and fast internet connection wherever you are, giving you unlimited VPN access with no bandwidth limits. Advanced Encryption and Secure Proxy Our top-notch encryption protocols and secure proxy act as a powerful shield, keeping your personal data and online engagements confidential. Therefore, you are protected from potential cyber threats and privacy intrusions from snoopers or hackers. Browse in public networks safely with access to online content. Our safe VPN service is equipped with advanced security and privacy features, including the SOCKS5 standard and SOCKS4 proxy, which were designed to shield you from online threats. Optimised for Streaming, Gaming, and More! Whether you’re running VPN for gaming, watching your preferred TV shows, movies, streaming videos, or listening to music, our fast speed VPN servers and secure proxy ensure low latency and high performance. Enjoy unlimited bandwidth and super-fast VPN speeds with just one tap. Connect to your favorite live sports and social networks with no lags. Compatible Across Multiple Devices & Easy to Use Our virtual private network offers a stable and secure VPN connection as you navigate the Internet. Forget about complicated settings and enjoy a super easy one-tap connection. With our user-friendly interface, you get instant access to privacy and security. Protection on Public Wi-Fi Our advanced encryption technology ensures that your private data is always protected at any Wi-Fi hotspot. Unlock the full potential of a global safer internet and access online content from any country securely. Affordable & Free Trial Period Try our private VPN for free by taking advantage of a free trial period. After your trial, choose any subscription type with affordable prices to continue enjoying our premium service. Features of VPN: Fast Speed Secure Proxy: Unlimited VPN usage with no time limits. High-speed proxy servers for seamless connections. Advanced VPN encryption to secure your data on public Wi-Fi. Private browsing with complete anonymity. Fast speed VPN servers with 24/7 reliability. Secure proxy to protect your online identity. One-tap connect for instant privacy and security. Download VPN: Fast Speed Secure Proxy now to enjoy: Super-fast VPN and proxy access worldwide. Unlimited browsing freedom with secure encryption. Fast speed VPN for streaming, gaming, and more. Private and secure internet access anywhere. With VPN: Fast Speed Secure Proxy, you always get super-fast speed, secure proxy servers, private browsing, and unlimited access — all in one simple app. Make your digital footprint safe and traverse the online world without boundaries! LEGAL & SUPPORT Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms & Conditions: https://mercuryapps.net/mercuryvpn/terms Privacy Policy: https://mercuryapps.net/mercuryvpn/privacypolicy Contact Us: For any queries, reach out to us at [email protected]
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
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expo-network
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.
