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
RayVPN: Secure Unlimited Proxy
get rayvpn to enjoy fast, private, and secure internet in an instant
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
10,887 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 included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 RayVPN: Secure 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 smarter reconnection logic and server selection.
Assumption to check: Connection issues with unstable networks
Validate with people who use this workflow before building.
Hypothesis 2
Offer more free servers while promoting premium options.
Assumption to check: Limited free server options
Validate with people who use this workflow before building.
Hypothesis 3
Simplify user interface for subscription management and clarity.
Assumption to check: Complex subscription management
Validate with people who use this workflow before building.
Hypothesis 4
Integrate a live chat or faster support options.
Assumption to check: Slow customer support response
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
get rayvpn to enjoy fast, private, and secure internet in an instant. that’s an easy-to-use vpn for iphone and ipad, trusted by millions of users worldwide. features: * free forever * no log is saved * no credit cards needed * no registration or login needed * hide your ip address and location * secure your internet with one tap connect * automatically connects you to the fastest vpn server * browse the internet without the fear of being watched and tracked ► fastest vpn servers connect to the fastest vpn servers worldwide to keep your internet connection protected from cybercriminals. ► secure vpn connection protect your privacy by connecting to our fully owned vpn servers, or upgrade to our vip subscription for more features. ► browse securely stay secure with military-grade encrypted traffic between your device and our servers while connected with ray vpn. ► stay private your privacy is our mission. connect to any of our reliable vpn servers, and know that we do not keep any logs of your activity. ► no registration required use all the basic features of the app without having to sign up, register, or enter your credit card. in-app purchase: you can be a rayvpn vip through an auto-renewing subscription. - payment will be charged to itunes account at confirmation of purchase - subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period - account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal - subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's account settings after purchase - no cancellation of the current subscription is allowed during an active subscription period terms of service: https://www.rayvpn6.com/static/useragreement.html privacy policy: https://www.rayvpn6.com/static/privacypolicy.html if you have any questions or suggestions, feel free and send them to [email protected]. follow us: facebook: https://www.facebook.com/rayvpn/ instagram: https://www.instagram.com/rayvpn.offical/ we’d love to hear from you :)
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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
Zustand
Axios
React Navigation
React Native Vector Icons
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.
