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
Cool VPN Pro-Secure Proxy VPN
Cool VPN Pro is a free, fastest and super unlimited VPN (Virtual Private Network) wifi proxy for iPhone and iPad devices.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
40,074 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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 Cool VPN Pro-Secure Proxy 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
Optimize server selection and connection algorithms.
Assumption to check: Connection speeds are often slow
Validate with people who use this workflow before building.
Hypothesis 2
Add more diverse server options.
Assumption to check: Limited server locations
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a more user-friendly ad experience or premium options.
Assumption to check: Frequent ads for free users
Validate with people who use this workflow before building.
Hypothesis 4
Simplify subscription tiers and clarify benefits.
Assumption to check: In-app purchase confusion
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
Cool VPN Pro is a free, fastest and super unlimited VPN (Virtual Private Network) wifi proxy for iPhone and iPad devices. √Reasons to choose Cool VPN Pro: ◆Simple, one tap connect to VPN Go online safely and anonymously in just one tap. ◆100% Secure free VPN The best secured free VPN clients for iPhone and iPad. ◆ No logs kept That means, that you're absolutely anonymous and protected while using our app. Your security and privacy are guaranteed! ◆ Connect automatically Set CoolVPN Free to auto-connect on WiFi, on cellular data, or stay connected to VPN online at all times. ◆Unparalleled VPN Performance Our proprietary servers ensure the fastest VPN speed, most stable and secured connections. ◆Campus Network Exclusive Secure your connection on public WiFi hotspots and at school. ◆Powerful online VPN security Protect your data and keep online activity more private with our VPN encryption. Secure your connection on public Wi-Fi hotspots and browse more anonymously wherever you go. ◆Streaming and gaming Streaming and gaming with super fast VPN, opera news, stream videos, live sports and TV shows on YouTube, Netflix without buffering. ◆Apps Bypass Settings You can allow specific apps to use the VPN service and other apps to use your original network. Stay with us! Stay free, secure, and anonymous while surfing the Internet with VPN - Super Unlimited Proxy. ◆Add Subscription details: - Your Apple ID account will be charged on the last day of your free trial. - Your subscription will automatically renew at the end of each billing period unless it is canceled least 24 hours before the expiry date. - You can manage and cancel your subscriptions by going to your App Store account settings after purchase. - Any unused portion of a free trial period,will be forfeited when you purchase a subscerption. Terms of use: https://coolvpn.cc/terms_of_use.html Privacy Policy: https://coolvpn.cc/privacy_policy.html
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
Axios
React Navigation
React Native Async Storage
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.
