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
Shield VPN - Secure FastVPN
Shield VPN is a fast, secure, and easy-to-use VPN service designed to protect your internet privacy and ensure safe browsing from anywhere in the world.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
732 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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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/
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 Shield VPN - Secure FastVPN: map the core Developer Tools workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Shield VPN is a fast, secure, and easy-to-use VPN service designed to protect your internet privacy and ensure safe browsing from anywhere in the world. Whether you’re connected to a public Wi-Fi network, mobile data, or home internet, Shield VPN helps encrypt your online traffic and keep your data safe from third parties. Key Features: - Global server network: Connect to servers in multiple countries for reliable and fast browsing - Strong encryption: Your internet traffic is encrypted using industry-standard protocols - No-logs policy: We do not monitor or store your browsing activity - One-tap connection: Simple interface for quick and easy VPN access - Stable performance: Enjoy smooth streaming, browsing, and downloading Shield VPN is ideal for: - Protecting personal information on public Wi-Fi - Enhancing online privacy and anonymity - Maintaining secure internet access while traveling - Keeping your internet activity private and secure Shield VPN does not collect or log user activity data. Privacy Policy: https://docs.google.com/document/d/1XtOqbVzgu6S3MK4s-XftemHMUd4eqv_lPNsrKQMV20M/edit?usp=sharing Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Written user reviews are not shown here. Check current App Store reviews >
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 reliable server connections and better error handling.
Assumption to check: VPN connection issues reported by users
Validate with people who use this workflow before building.
Hypothesis 2
Expand server network and allow users to suggest locations.
Assumption to check: Limited server locations
Validate with people who use this workflow before building.
Hypothesis 3
Enhance support channels and provide faster response options.
Assumption to check: Slow customer support response times
Validate with people who use this workflow before building.
Hypothesis 4
Simplify pricing structure and provide clearer information on benefits.
Assumption to check: Complicated subscription options
Validate with people who use this workflow before building.
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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Axios
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Expo
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.
