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
Mix VPN - Fast & Unlimited
Discover the pinnacle of security and privacy with Mix VPN, an advanced Virtual Private Network solution designed to safeguard your online activities
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
1,143 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 included16 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 Mix VPN - Fast & Unlimited: 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 more extended free trial or value-added features for free users.
Assumption to check: Limited free usage before prompting for payment
Validate with people who use this workflow before building.
Hypothesis 2
Implement a server quality indicator to help users choose faster options.
Assumption to check: Connection speed can be inconsistent
Validate with people who use this workflow before building.
Hypothesis 3
Simplify settings and provide tooltips or help sections.
Assumption to check: Complex settings and features may confuse users
Validate with people who use this workflow before building.
Hypothesis 4
Consider offering an ad-free experience as part of premium.
Assumption to check: Ads can be intrusive
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
Discover the pinnacle of security and privacy with Mix VPN, an advanced Virtual Private Network solution designed to safeguard your online activities. Mix VPN offers unparalleled features that ensure a secure and confidential connection to the Internet, setting a new standard in digital protection. Mix VPN is a robust implementation of Virtual Private Network technology, offering a secure and private Internet connection. Key Features of Mix VPN: 1. Strict no-logs policy: Mix VPN ensures your browsing history and personal data are never logged or collected. 2. Multi-hop function: Utilize sequences of servers to enhance your anonymity and security online. Our AI-based server selection feature intelligently chooses servers based on real-time channel conditions specific to your current location. 3. Kill-Switch: Kill-switch feature automatically blocks internet traffic if the VPN connection drops, ensuring your data remains protected. 4. Impressive speed: Benefit from high connection speeds across our VPN servers. 5. State-of-the-art encryption: We employ the IKEv2 protocol to maximize your online data security. 6. Global server network: Connect to servers in over 10 countries worldwide with Mix VPN. 7. User-friendly interface: Enjoy advanced protection with an intuitive setup that's accessible to everyone. 8. 24/7 customer support: Our team is available round-the-clock to assist you with any inquiries. Mix VPN acts as your trusted online shield, safeguarding privacy and granting access to Internet resources while protecting you from threats like hacking, fraud, and unwanted data surveillance. Subscription Details: Subscribe now for ad-free full access! Experience our service with a free three-day trial, which automatically converts to a paid subscription. Choose from weekly, monthly, or annual subscription plans. Payment will be charged upon purchase confirmation. You can cancel anytime before the current period ends to avoid auto-renewal. Manage your subscription and disable auto-renewal in your account settings after payment. Unused trial periods will be forfeited upon subscribing. For more details, refer to our privacy policy at https://guavabravotechnology.com/privacy.html and our EULA at https://guavabravotechnology.com/eula.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
Async Storage
FastAPI
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.
