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
VPN Proxy OvpnSpider Pro
* Provides a large number of free VPN servers with optional locations.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
11,054 ratings · Top 30%
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 included15 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 VPN Proxy OvpnSpider Pro: map the core Productivity 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 wider range of server locations and types.
Assumption to check: Limited server options can frustrate users.
Validate with people who use this workflow before building.
Hypothesis 2
Implement more stable connection protocols.
Assumption to check: Connection drops frequently.
Validate with people who use this workflow before building.
Hypothesis 3
Create a more transparent and user-friendly subscription process.
Assumption to check: In-app purchase process can be unclear.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize data fetching and caching for faster access.
Assumption to check: App can be slow to load server lists.
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
* Provides a large number of free VPN servers with optional locations. * Keep your mobile activities safe & private. protect your online privacy when using the Internet in potentially unsafe locations, such as unprotected WiFi hotspots in hotels or cafes. --------Features-------- * Free * Servers grouped by countries, So you can select the country you want to connect easily. --------User Guide-------- OvpnSpider will automatically search for free VPN servers on the Internet; and the result is provided as an OpenVPN profile which is categorized by countries. User can connect to the VPN server in-app directly. -- Clicking the selected server on the list will connect to vpn server automatically. =============================================== User also can export OpenVPN Profile .ovpn to other Applications. --Clicking the share icon on the list will launch a popup view of the available applications. -- If OpenVPN (the 'openvpn connect' application is already installed) is selected, the profile will be automatically imported into OpenVPN and then the user could connect to the VPN server. -- If Mail is selected, the OpenVPN Profile .ovpn will be automatically inserted into the email as an attachment. and the user can share the OpenVPN profile files to other devices or other users through the email. Thus other equipments which have already installed the OpenVPN application, could use the profile to connect to VPN server. Notes on our auto-renewing subscriptions - Your iTunes account will be charged for subscription renewal within 24-hours prior to the end of the current period. - You can turn off the auto-renew (by going to the user's Account Settings after purchase) at any time (24-hours before the end of the current period), but No cancellation for the current subscription period. ■ Privacy Policy: * We do not log your browsing activity, DNS queries, traffic destinations, or content. * We do not embed any advertising SDKs or third-party tracking tools. * We do not use Google Analytics, Firebase, or any third-party analytics services. * We do not use cookies or advertising IDs for tracking or targeted advertising. * We do not sell or share your information with advertisers or data brokers. - Check out our privacy policy and terms of use: Privacy policy: https://www.arcnice.com/legacy/privacy_policy_vpn.html Terms of use: https://www.arcnice.com/legacy/terms_of_use.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
Zustand
Expo Location
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.
