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
biubiuVPN : VPN
biubiuvpn is a user-friendly, smooth, secure and private vpn service that provides 24/7 private internet access without logging your browsing history, selling your data to third parties, or restricting downloads
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.1
5,786 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 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 biubiuVPN : 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
Optimize server selection algorithms to prioritize faster connections.
Assumption to check: Some users report slow connection speeds.
Validate with people who use this workflow before building.
Hypothesis 2
Expand server locations and provide user feedback on preferred servers.
Assumption to check: Limited server locations compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the paywall presentation and clarify the benefits of premium features.
Assumption to check: Paywall can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 4
Implement automatic reconnection features and provide users with notifications.
Assumption to check: Occasional connection drops.
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
biubiuvpn is a user-friendly, smooth, secure and private vpn service that provides 24/7 private internet access without logging your browsing history, selling your data to third parties, or restricting downloads. it protects all your connected devices from being tracked and provides complete online security and freedom. biubiuvpn offers the following features and benefits: smart mode no more troublesome vpn connection interruptions due to the use of certain applications. use biubiuvpn's smart mode to browse any application or website without interruptions. in addition, when smart mode is enabled, the vpn will give preference to local routes when accessing services in your home country, ensuring a smooth and seamless browsing experience multi-hop mode this feature encrypts and forwards data through multiple server nodes to prevent data eavesdropping and tracking, ensures enhanced online security by safeguarding your digital identity and maintaining confidentiality of your location information, providing further security and freedom for users to access the internet. private servers each user gets a fixed ip4 address, guaranteeing personalized and uninterrupted access to the network and avoiding illegal intrusions and cyber threats. enjoy a new level of internet freedom and security with biubiuvpn, allowing you to surf the internet without worry. streaming media optimization enhances the quality of media streaming, ensuring a smooth and stable viewing experience. for regions with variable internet quality, biubiuvpn optimizes network connectivity, potentially improving the efficiency of online access. ultimate privacy biubiuvpn ensures that your data is secure and never tracks or stores what you are doing online. it also provides the security of public wi-fi and allows you to browse the internet privately, without anyone knowing which sites you visit. fast vpn server network biubiuvpn offers a fast vpn server network that lets you choose the most suitable vpn server in your country or region. it provides bulletproof protection for your data without sacrificing speed. no hassle connecting to biubiuvpn is easy and hassle-free, it only requires two steps: downloading and connecting. connection logs are only stored locally and are not synced to the server. 24/7 customer support our customer support team is always available to assist you with any problems you may encounter ([email protected]). for more information, please review our terms of service and privacy policy at terms of service: https://biuvip.com/#/terms privacy policy: https://biuvip.com/#/privacy
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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
react-native-async-storage
react-native-modal
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.
