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
The Free VPN ™
unlimited vpn services with free vpn
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
11,038 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 included17 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 The Free 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
Implement a speed test feature to show users optimal servers.
Assumption to check: Connection speeds can vary significantly.
Validate with people who use this workflow before building.
Hypothesis 2
Expand server locations to provide more options.
Assumption to check: Limited server locations.
Validate with people who use this workflow before building.
Hypothesis 3
Offer an ad-free experience with subscriptions.
Assumption to check: In-app ads can be intrusive.
Validate with people who use this workflow before building.
Hypothesis 4
Provide clear, concise explanations of privacy practices.
Assumption to check: Privacy policies can be unclear.
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
unlimited vpn services with free vpn. the best security solution for your all devices. free vpn by thefreevpn™ for your smart devices lets you secure your apps and websites. just a single tap to connect to the best vpn servers with ultra-fast speed. once you tap the connect button, you can fully protect your online presence. the free vpn is pro with compatibility. it protects your all web browsers including opera mini, safari, chrome, and firefox. not only this, but it also protects your other apps while using the public network connection. why choose the free vpn? protect your privacy. no registration and settings are required global vpn servers (uk, usa, australia, canada, netherlands, france, germany, poland, singapore, india ……) single tap connection high-speed bandwidth user friendly easy to use best for gaming and streaming it secures your device connection while you are connected to public wifi hotspots. most stable connection access global content we are the best vpn app in the store! install free vpn today, and secure your internet now. if free vpn fails to make a connection, you can follow these steps to fix it: *switch to any other server. *relaunch your application and try connecting again. *restart your device. hoping your suggestions and good ratings keep us growing. we are always here with you. contact us if you face any issues via [email protected] privacy policy: https://thefreevpn.org/site/privacy.html terms of use: https://thefreevpn.org/site/terms.html subscription: https://thefreevpn.org/site/subscription.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
React Navigation
Axios
React Native Async Storage
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.
