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
TOP VPN - Easy Fast Secure
TOP VPN is 100% unlimited, fast and secure VPN proxy for all users
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
1,183 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/
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 TOP VPN - Easy Fast Secure: 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
Expand server list and allow users to suggest new locations.
Assumption to check: Limited server options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement better stability checks and reconnect features.
Assumption to check: Connection drops frequently
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription process and provide clearer information.
Assumption to check: Confusing subscription management
Validate with people who use this workflow before building.
Hypothesis 4
Offer in-app chat support for immediate assistance.
Assumption to check: Slow customer support responses
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 VPN is 100% unlimited, fast and secure VPN proxy for all users. You only need one click to unlock and access your favorite websites and applications. It provides a completely Unlimited data, unlimited bandwidth and unlimited global servers. Besides, it always protects your privacy. - Large number of servers, high-Smart bandwidth. - Works with Wi-Fi, LTE/4G, 3G and all mobile data carriers. - Strict no-logging policy - Smartly choose the best server - Well-designed UI - No usage and time limit - No registration or configuration required - No additional permissions required - Unblock web sites and apps ,like facebook,twitter,instagram,whatsapp,telegram You can be a premium user through auto-renewing subscription: 12-Month Plan, first 3 days free and then $89.99/year 1-Month Plan $9.99/Month 1-Week Plan $8.99/Week - Payment will be charged to iTunes Account at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal – Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s Account Settings after purchase - You may cancel a subscription during its free trial period via the subscription setting through your iTunes account. This must be done 24 hours before the end of the subscription period to avoid being charged. Please visit http://support.apple.com/kb/ht4098 for more information - You may turn off the auto-renewal of your subscription via your iTunes Account Settings. However, you are not able to cancel the current subscription during its active period - Any unused portion of a free-trial period, will be forfeited when the user purchases a subscription Links to our Terms of Service and Privacy Policy can be found below. Terms of Service: https://www.topvpn.cc/aboutme/service_agreement.html Privacy Policy: https://www.topvpn.cc/aboutme/protocol_privacy.html
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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
axios
react-navigation
react-native-async-storage
react-native-vector-icons
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.
