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
ZenVPN - Free Super Fast VPN
Fast, Secure & Private VPN Proxy
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
964 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 included14 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 ZenVPN - Free Super Fast VPN: 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
Fast, Secure & Private VPN Proxy Experience a fast, reliable, and secure VPN service designed to protect your privacy and enhance your online security. Our app connects you to high-speed global servers, ensuring smooth browsing, seamless streaming, and encrypted data protection. Key Features • Fast & Stable VPN Proxy – Enjoy smooth browsing with high-speed servers worldwide. • Secure & Private Connection – Your data is encrypted for enhanced online security. • Easy One-Tap Connection – Connect to the best available server instantly. • Optimized for Streaming & Gaming – Reduce lag and access region-specific content. • Global Server Network – Choose from multiple locations for an optimal experience. Your Privacy Matters We are committed to protecting your privacy. We do not log, track, or share any user activity, ensuring a completely secure and private browsing experience. Legal Notice This app is intended to enhance online security and improve connection stability. Users must comply with all local laws and regulations. Any illegal usage is strictly prohibited. Privacy Policy: https://docs.google.com/document/d/1LXws1z2olqP8W0cD-yhI3yjwRVIq4438l5CXNE1KfyI/edit?usp=sharing Terms of Use: 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
Offer a wider range of servers to improve user experience.
Assumption to check: Limited server locations
Validate with people who use this workflow before building.
Hypothesis 2
Create a more straightforward pricing structure with clearer benefits.
Assumption to check: Confusing subscription model
Validate with people who use this workflow before building.
Hypothesis 3
Optimize connection algorithms to reduce latency.
Assumption to check: Slow connection times
Validate with people who use this workflow before building.
Hypothesis 4
Implement a more cohesive design language across the app.
Assumption to check: Inconsistent UI design
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
Zustand
react-native-elements
expo-location
react-navigation
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.
