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 - fast, secure, no limits
Our VPN is a secure, fast, unlimited and convenient VPN that allows you to access websites and services with just one touch
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
7,132 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 - fast, secure, no limits: 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
Offer a wider selection of global servers.
Assumption to check: Limited server locations
Validate with people who use this workflow before building.
Hypothesis 2
Implement better reconnection logic.
Assumption to check: Occasional connection drops
Validate with people who use this workflow before building.
Hypothesis 3
Simplify UI with clearer navigation.
Assumption to check: User interface can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance for different networks.
Assumption to check: Inconsistent performance
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
Our VPN is a secure, fast, unlimited and convenient VPN that allows you to access websites and services with just one touch. Our free VPN will help you speed up games and protect the security of your network on the Internet. Why is our free VPN the best VPN for you?! - Lots of free and fast servers all around the world! Choose a free server convenient for you anywhere in the world! If you do not want to choose, then we will do it for you and connect you to the fastest one with one touch! - Maximum security and anonymity! We do not save and do not share with anyone the history of visiting websites and apps. Website owners will not know your real IP address. - Convenient and very easy! Simply install our app, run it and press one "connect" button, after that you will get access to any website! - Minimum ads! Privacy Policy: https://docs.google.com/document/d/1iKq8rnj7IIDWW4m_DBjx5saAzsdmBtGvtVnwbc54IoM Terms of Service: https://docs.google.com/document/d/19frdep3_HPB8pXL9pCydH_8Zny8FstmlKCvG3ULkaL0
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
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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.
