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 by Private Internet Access
PIA VPN puts you in control of your online experience with unparalleled privacy features and ultra-fast servers.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
150,152 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 by Private Internet Access: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
PIA VPN puts you in control of your online experience with unparalleled privacy features and ultra-fast servers. Trusted by Tom's Guide, TechRadar, and millions of users worldwide! Why PIA VPN Is a Top Choice For The USA? ▶ 7-Day Free VPN Trial Test PIA risk-free for seven days and explore the full feature set with our 30-day money-back guarantee. ▶ Stream Sports Without Limits Catch every game, race, and match with lightning-fast 10-Gbps servers across all 50 US states and 90+ countries. Enjoy lag-free sports streaming in UHD, no matter where you are. ▶ Advanced Privacy with No-Logs Policy Stay private with PIA’s independently audited no-logs policy. Your browsing history and online activity are never tracked or stored. ▶ Block Ads With MACE Enjoy faster, safer browsing by blocking ads, trackers, and malware using PIA’s built-in MACE feature. ▶ One Subscription, Multiple Benefits Protect your phone, tablet, laptop, and more with one PIA subscription. Works on iOS, macOS. Top Features to Enhance Your Online Freedom: ■ Transparent and Open Source PIA’s apps are 100% open-source, so you can trust and verify the code that protects your privacy. ■ Smart Kill Switch Automatically block internet traffic if your VPN connection drops, ensuring your data stays protected at all times. ■ Split Tunneling Customize your VPN use by routing certain apps through the VPN while others connect directly to the internet. ■ Better Speed & Security Our Wireguard protocol ensures faster VPN speeds and more secure connections. ■ Download PIA VPN Today Join millions of satisfied users and experience the ultimate blend of privacy, speed, and security. Privacy Policy https://www.privateinternetaccess.com/privacy-policy Terms of Service https://www.privateinternetaccess.com/terms
Written user reviews are not shown here. Check current App Store reviews >
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 server load balancing to optimize speed.
Assumption to check: Users report slow connection speeds
Validate with people who use this workflow before building.
Hypothesis 2
Expand server options to include more countries.
Assumption to check: Limited server locations
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the in-app purchase workflow.
Assumption to check: Complicated subscription process
Validate with people who use this workflow before building.
Hypothesis 4
Enhance connection stability and failure recovery.
Assumption to check: Frequent disconnections
Validate with people who use this workflow before building.
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
Redux
BUILD KIT DIFFICULTY
Expert
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.
