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
ExpressVPN · Secure & Fast VPN
ExpressVPN: Premium VPN for Security, Privacy, and Blazing-Fast Streaming
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
419,983 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.
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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'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 ExpressVPN · Secure & Fast VPN: 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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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
ExpressVPN: Premium VPN for Security, Privacy, and Blazing-Fast Streaming Surf the web safely with just a few taps. ExpressVPN is a premium VPN service built for ultra-fast connections and private browsing on public Wi-Fi and other shared networks - across all your devices. BLAZING-FAST SERVERS Stream, game, and browse with lightning-fast speeds and unlimited bandwidth. Perfect for streaming your favorite TV shows and movies, sporting events, and more. LARGE SERVER NETWORK Access a global network with servers in 113 countries, including all 50 U.S. states, so you're covered wherever you go. NO-LOGS POLICY (INDEPENDENTLY AUDITED) Browse with enhanced privacy. Our strict no-logs policy has been independently audited to help ensure your IP address, location, and online activity stay private. POWERFUL ONLINE SECURITY Protect your data and online activity with advanced encryption that keeps your connection safe - even on public Wi-Fi hotspots and shared networks. EXCLUSIVE VPN PROTOCOL ExpressVPN's Lightway protocol was crafted from the ground up for enhanced speed, security, and reliability. PRIVACY-FIRST TECHNOLOGY ExpressVPN runs on RAM-only servers that never write data to a hard drive. All data is wiped on every reboot. WIDE LANGUAGE SELECTION Choose from 17 languages to make your app experience smooth and accessible, wherever you are in the world. 24/7 CUSTOMER SUPPORT Get instant help whenever you need it. Reach out via live chat or email, and our experts will gladly answer any questions. iOS APP FEATURES • Auto-reconnects if your VPN connection drops • Supports Lightway (UDP/TCP), OpenVPN (UDP/TCP), WireGuard, and IKEv2 encryption protocols • Threat Manager: helps prevent apps from sharing your activity with trackers or malicious third parties SUBSCRIPTION PLANS Your ExpressVPN subscription includes access to apps across all major platforms, letting you secure all your devices. With support for up to 14 simultaneous connections, you can stay protected anytime, anywhere. Subscriptions renew automatically at the end of each billing period unless canceled at least 24 hours beforehand. You can manage or cancel your subscription anytime in your App Store account settings. Any unused portion of a free trial is forfeited when you purchase a Subscription. Terms of Service https://www.expressvpn.com/tos Privacy Policy https://www.expressvpn.com/privacy-policy
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 a more stable connection algorithm.
Assumption to check: Connection drops unexpectedly.
Validate with people who use this workflow before building.
Hypothesis 2
Add more global servers for better coverage.
Assumption to check: Limited server locations.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify subscription plans and provide clearer comparisons.
Assumption to check: Confusing subscription options.
Validate with people who use this workflow before building.
Hypothesis 4
Improve support response times through in-app chat.
Assumption to check: Slow customer support response.
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
React Native
Expo
react-navigation
axios
react-native-reanimated
expo-location
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.
