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
Opera Browser with VPN
Fast, safe and private, Opera is a beautifully-designed web browser with a Red Dot Award-winning interface
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
258,090 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 included17 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 Opera Browser with 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
Offer customizable themes, layouts, and toolbar options.
Assumption to check: Limited customization options for the browser interface
Validate with people who use this workflow before building.
Hypothesis 2
Implement a faster, more reliable VPN service with user-selected server locations.
Assumption to check: VPN performance can be inconsistent
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the settings interface and provide clear explanations for each option.
Assumption to check: Confusing settings menu with too many options
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a feature to save pages for offline access.
Assumption to check: Lack of offline browsing capabilities
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
Fast, safe and private, Opera is a beautifully-designed web browser with a Red Dot Award-winning interface. Loved by millions worldwide, Opera is built for people on the go, delivering lightning-fast browsing with powerful privacy tools. The All-New Opera One for iOS Experience a browser that moves with you, with a sleek bottom search bar for effortless thumb-driven browsing. Enjoy a more immersive full-screen experience and fluid navigation with intuitive, smooth-swipe gestures. Ad-Free Browsing with an Enhanced Native Ad Blocker Say goodbye to distractions and hello to faster page loading. Opera’s built-in Ad Blocker removes intrusive ads and pop-ups automatically, helping pages load faster and making browsing smoother and cleaner. Built-in VPN Enjoy enhanced privacy. Opera’s built-in VPN encrypts your browsing traffic and masks your location with a strict no-logs policy. No subscriptions, logins, or extra extensions required. Just turn it on with a single tap to shield your personal data on any network. Sync Stop leaving your tabs behind. Whether you’re stepping out for coffee or switching to the couch, Opera makes life easy. Sync your mobile and desktop browsers to access your open tabs, bookmarks, and speed dials instantly. Pick up exactly where you left off, no searching, no re-typing, just seamless browsing. Meet Opera AI Discover a smarter way to explore the web with Opera AI, seamlessly integrated into your browsing experience. You can now search with AI directly from the address bar, making it easier than ever to ask questions, explore topics, and find information instantly while browsing. Your Browser, Your Design Customize your browser with beautiful wallpapers or upload your own images to match your style. Whether you prefer minimal, colorful, or personal designs, Opera lets you shape your browsing environment exactly the way you like it. Designed for One-Hand Browsing Choose between sleek Bottom Navigation or the Fast Action Button (FAB) for total control of your browsing experience. Swipe gestures make it easy to switch tabs, reload pages, share links, or return to recent tabs. All with one hand. ABOUT OPERA Founded in 1995 in Norway on the idea that everyone should have fast access to the web, we have spent the last 30+ years helping millions browse in a safe, private, and innovative way. We care about the internet, about open standards, and about people. By downloading this application, you are agreeing to the End User Licence Agreement at https://www.opera.com/eula/mobile. Also, you can learn how Opera handles and protects your data in our Privacy Statement at https://www.opera.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-netinfo
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.
