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
Stardust VPN - VPN for iPhone
Features of our VPN application:
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
6,781 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/
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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 Stardust VPN - VPN for iPhone: 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
Offer more features in the free plan to attract users.
Assumption to check: Limited free features compared to premium options.
Validate with people who use this workflow before building.
Hypothesis 2
Implement better server management and diagnostics.
Assumption to check: Connection issues with some servers.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify subscription options and provide better user guidance.
Assumption to check: Complicated subscription management.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance support with live chat and FAQs.
Assumption to check: Lack of customer support options.
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
Features of our VPN application: Use the Stardust VPN app without registration! Unlimited time, unlimited data, unlimited bandwidth. You can use our VPN app on multiple devices. App does not record users and time of use We use VPN to keep ourselves safe online. Secure Internet, freedom of use, and web anonymity are not just words today, but a vital necessity. With so many services out there, can you call your VPN pro? How well does your VPN protect your iPhone? Do videos and pages load fast enough? In addition to core features, the truly pro VPN service should be simple and fast. But some VPN services can ruin your online experience instead of protecting you. Think of an iPhone VPN, like if Apple would build the flagship security solution. Think of a service you can start using right away and for free, faster than launching Tor, a VPN service designed specifically for those who want to be sure that their traffic is secured. Think of the free VPN platform, enabling not only individual but also business protection. Think it’s not real? But it’s right here — meet Stardust VPN. Links to our Terms of Use and Privacy Policy can be found below. Privacy Policy: https://docs.google.com/document/d/1LAKWXFpCp86rDqClTvy6EqHYJ6jBc2Vy Terms of Use: https://docs.google.com/document/d/1t0T3_L2QbIY9ruIzvxO4at6DJPQcvZ_PQ5htyj1EVVI/
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
Axios
Zustand
React Navigation
Shadcn/ui
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.
