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
CoreDefence VPN - Data Guard
DESCRIPTION
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
433 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 CoreDefence VPN - Data Guard: 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
Implement better connection stability checks.
Assumption to check: Connection drops frequently
Validate with people who use this workflow before building.
Hypothesis 2
Expand server locations for better user experience.
Assumption to check: Limited server options
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription process and provide clear explanations.
Assumption to check: In-app purchases are confusing
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance for better speed.
Assumption to check: Sluggish performance during high traffic
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
DESCRIPTION CoreDefence VPN is a secure and easy-to-use solution designed to protect your online privacy, safeguard your data, and provide reliable internet access across different networks. With CoreDefence VPN, your internet connection is encrypted, your IP address is masked, and your online activity is protected. Whether you’re browsing at home, using public Wi-Fi, traveling, or working remotely, CoreDefence VPN helps keep your connection secure and your data protected. KEY FEATURES • Secure VPN connection with encrypted traffic • Data protection on public and private Wi-Fi networks • IP address masking for enhanced privacy • Safe access for browsing, apps, and streaming • High-speed global servers for stable performance • One-tap connection for quick and easy use • No activity or browsing logs WHY COREDDEFENCE VPN CoreDefence VPN is built with a strong focus on privacy, data protection, and stable performance. The app runs smoothly in the background, allowing you to browse, stream, and work online with confidence and security wherever you are. SUBSCRIPTIONS CoreDefence VPN offers auto-renewable subscription plans, allowing users to choose the option that best fits their needs: • 1 Week subscription — $9.99 Includes a 3-day free trial • 1 Month subscription — $16.99 • 6 Months subscription — $65.99 • 12 Months subscription — $95.99 Payment will be charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless auto-renewal is turned off at least 24 hours before the end of the current subscription period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage or cancel your subscription at any time through your Apple ID account settings. If a free trial is offered, any unused portion of the free trial will be forfeited when a subscription is purchased. Prices may vary by country or region. PRICING & ACCESS INFORMATION The weekly subscription is offered as a flexible short-term option for users who want full premium access without a long-term commitment. Pricing reflects the operational costs of maintaining a high-quality VPN service, including server infrastructure, security updates, monitoring, and ongoing maintenance. The weekly subscription may be shown on first app launch and when a user attempts to access premium features. All available plans - weekly, monthly, 6-month, and 12-month - are accessible at any time via the “Get Premium” banner in the app. LEGAL & SUPPORT Website: https://coredefence.website Privacy Policy: https://coredefence.website/policy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Support Email: [email protected]
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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
axios
react-native-async-storage
expo-linear-gradient
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.
