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
Star VPN - Super Fast Proxy
Star VPN is best VPN for iPhone, iPad and iPod touch with unlimited bandwidth.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
31,672 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included16 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 Star VPN - Super Fast 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 a more stable connection protocol.
Assumption to check: Frequent disconnections during usage
Validate with people who use this workflow before building.
Hypothesis 2
Add more server options and locations.
Assumption to check: Limited server locations
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription process with clearer options.
Assumption to check: Confusing subscription management
Validate with people who use this workflow before building.
Hypothesis 4
Optimize server performance and improve speed.
Assumption to check: Slow connection speeds
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
Star VPN is best VPN for iPhone, iPad and iPod touch with unlimited bandwidth. No logs saved. No registration required. One tap connect to fastest VPN servers. - Secure your connection Star VPN provides additional level of security while your device connected to WiFi hotspots and other public internet sources. All your internet traffic is strongly encrypted. - Protect your privacy Star VPN lets you access websites and apps anonymously with no concern about being tracked by your ISP or anybody else as your IP address will be changed. You can be a Premium member and get more features through auto-renewing subscription: Month: $9.99 Year: $35.99 / 12 = only $2.99 per month! - You can use same subscription on up to 6 devices on all supported platforms - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period - Payment will be charged to iTunes Account at confirmation of purchase - 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 active subscription period Privacy Policy: https://starvpnapp.com/privacy Terms of Service: https://starvpnapp.com/terms Contact us: https://starvpn.zendesk.com/hc/en-us/requests/new
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
React Navigation
Axios
React Native Async Storage
React Native Net Info
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.
