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
Turbo VPN Private Browser
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Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
206,312 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'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 Turbo VPN Private Browser: 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
Introduce a speed test feature to help users choose the best server.
Assumption to check: Inconsistent connection speeds depending on server choice.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize themes and other settings.
Assumption to check: Limited customization options for user preferences.
Validate with people who use this workflow before building.
Hypothesis 3
Offer an ad-free premium experience with a clear value proposition.
Assumption to check: In-app ads can be intrusive.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify onboarding and enhance user guidance.
Assumption to check: Complex navigation for new users.
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
Want to protect online privacy and secure iPhone data? Try Turbo VPN global servers now! Surf privately and securely, encrypt your traffic, and enjoy a fast online experience. Turbo VPN Features: Surf the web privately Turbo VPN hides your true IP address and is fully committed to your digital privacy. We follow a strict no-log policy. Stay secure on Wi-Fi hotspots Secure your internet connection anytime, anywhere with our stable vpn servers. Rest assured when you connect to a Wi-Fi hotspot next time. Access your favorite content Ultra-fast vpn servers let you browse different sites and stream the world freely no matter where you are. Worldwide VPN servers We have more than 10000 servers located across 40+ countries. Connect to any servers you like and anonymize your online activity straight away. With the new search feature, you can easily find and enjoy your favorite server. Stable and fast connection A large amount of VPN servers to ensure you a better private web browsing experience. Easy to use Turbo VPN brings you a one tap VPN solution where it only takes one tap to set up a secure connection. For policy reason, this service is not available in China. We apologize for any inconvenience caused. Additional Subscription Information - Subscription may be cancelled at any time within the iTunes and App Store Apple ID Settings. All prices include applicable local sales taxes. - 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. - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. - Offer limited to one 3 day trial per user. After the first 3 days, subscription renews automatically unless cancelled before the end of the 3 day trial. Privacy Policy & Terms of Use Privacy Policy: https://turbovpn.com/ios/privacy_policy.html Terms of Use: https://turbovpn.com/terms-of-service ______________________ Download Turbo VPN Private Browser! Enjoy fast and private browsing at your fingertips! Protect your online privacy and surf anonymously now! We never store or share your IP address.
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
zustand
axios
react-native-webview
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.
