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
Buddy VPN
Buddy VPN — your simple and secure way to fast, private internet access
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
1,423 ratings · Top 5%
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 Buddy 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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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 more generous free tier with essential features.
Assumption to check: Limited free features compared to other VPN apps
Validate with people who use this workflow before building.
Hypothesis 2
Improve server reliability and connection speed.
Assumption to check: Occasional connectivity issues
Validate with people who use this workflow before building.
Hypothesis 3
Expand server availability to include more countries.
Assumption to check: Limited server locations
Validate with people who use this workflow before building.
Hypothesis 4
Simplify pricing and provide clearer value propositions for each tier.
Assumption to check: Confusing subscription options
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
Buddy VPN — your simple and secure way to fast, private internet access Buddy VPN is a next-generation VPN client built on advanced VLESS protocols — offering the perfect balance of speed, stability, and security for modern users. LIGHTNING-FAST CONNECTION Buddy VPN uses modern network technologies and optimized data routing to deliver maximum speed while streaming, browsing, gaming, or downloading large files — with no slowdowns or buffering. TOP-TIER SECURITY Built on VLESS protocols, Buddy VPN ensures enhanced encryption, total privacy, and protection against surveillance or data leaks. Your internet activity remains fully secure and anonymous. SIMPLE & INTUITIVE The minimal, user-friendly interface makes Buddy VPN easy to use — connect or disconnect with just one tap. No technical skills needed. HOW TO CONNECT 1. Get your access key from your VPN provider. 2. The app supports vless:// links. 3. Paste the key into the app — and enjoy safe, encrypted access to the open internet. Buddy VPN — simple, fast, and private Your connection to a truly free internet. Privacy Policy: https://buddy-vpn.gitbook.io/buddy_vpn/privacy-policy Terms of Use: https://buddy-vpn.gitbook.io/buddy_vpn
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
Zustand
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react-navigation
expo-secure-store
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.
