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
VPN - Top Fast VPN Lite
Top Fast VPN Lite is your go-to solution for fast, secure, and unrestricted internet access
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
844 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 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 VPN - Top Fast VPN Lite: 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
Expand server offerings to include more global locations.
Assumption to check: Limited server locations compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a speed optimization feature.
Assumption to check: Inconsistent connection speed
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a more user-friendly subscription model with a clear value proposition.
Assumption to check: In-app purchase prompts can be intrusive
Validate with people who use this workflow before building.
Hypothesis 4
Add a feature to view connection history and performance metrics.
Assumption to check: Lack of detailed connection logs
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
Top Fast VPN Lite is your go-to solution for fast, secure, and unrestricted internet access. Designed for users who prioritize privacy and speed, this VPN app allows you to explore the online world without limitations. Key Features - Global Server Network: With servers located in multiple countries, Top Fast VPN Lite ensures you can connect quickly and securely from anywhere in the world. Enjoy seamless browsing whether you're in the USA, Europe, Asia, or beyond. - Robust Security: Utilizing advanced encryption protocols, Top Fast VPN Lite protects your personal data from potential threats. Your online activities remain private and secure, even when using public Wi-Fi networks. - User-Friendly Interface: Experience effortless navigation with a simple and intuitive design. Connect to the VPN with just one tap, making it accessible for both beginners and experienced users. - High-Speed Connectivity: Enjoy fast internet speeds for streaming, gaming, and browsing without interruptions. Top Fast VPN Lite optimizes your connection to provide a smooth online experience. - Affordable Plans: Offering competitive subscription options, Top Fast VPN Lite makes it easy for everyone to access premium privacy services without breaking the bank. - Multi-Device Compatibility: Whether on your phone, tablet, or laptop, Top Fast VPN Lite provides reliable protection across all your devices. Why Choose Top Fast VPN Lite? Top Fast VPN Lite not only enhances your online security but also allows you to access any app effortlessly. Stream your favorite shows, access social media platforms, and enjoy a truly internet experience. Download Top Fast VPN Lite today to secure your digital footprint and enjoy the freedom of a private online journey! Please read our Privacy Policy at https://topfastvpn.tawk.help/article/privacy Check out our Terms of Service at https://topfastvpn.tawk.help/article/terms
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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
react-navigation
react-native-gesture-handler
expo-network
react-native-reanimated
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.
