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 GX
Opera GX brings the gaming lifestyle to your mobile
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
93,082 ratings · Top 5%
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 included18 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 Opera GX: 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 performance settings and resource management.
Assumption to check: App can be resource-heavy and slow on older devices
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the user interface for easier navigation.
Assumption to check: Customization options can be overwhelming for new users
Validate with people who use this workflow before building.
Hypothesis 3
Provide more integrated tools and features.
Assumption to check: Limited in-built tools compared to competitors
Validate with people who use this workflow before building.
Hypothesis 4
Clarify pricing and value proposition for users.
Assumption to check: In-app purchases can be confusing
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
Opera GX brings the gaming lifestyle to your mobile. Express yourself with custom skins, discover free games and the best deals with GX Corner, share links easily between mobile and desktop with My Flow, and much more. All in a secure, private browser. Designed for gamers Opera GX’s unique design is inspired by gaming and gaming gear, with the same style that won the desktop GX browser the Red Dot and IF Design awards. Choose from custom themes like GX Classic, Ultra Violet, Purple Haze and White Wolf. Free games, gaming deals, upcoming releases Always just a tap away, GX Corner brings you daily gaming news, an upcoming release calendar and trailers. It’s everything a gamer needs to stay on top of the latest news and gaming deals in their mobile web browser. Connect your phone and computer Just scan a QR code to connect your phone and computer with Flow. It’s encrypted and safe, with no login, password or account needed. Send links, videos, files and notes to yourself in a single click, and access them instantly in your web browser on all your devices. Lightning fast browser Choose between the Fast Action Button (FAB) and standard navigation. The FAB is always within reach of your thumb and uses vibrations when you interact with it, which is perfect when you’re on the move. Private browser: ad blocker, cookie dialog blocker, and more Browse safely and load pages faster with integrated security features like the built-in ad blocker and cookie dialog blocker. This secure browser also comes with cryptojacking protection, stopping others from using your device to mine cryptocurrencies. About Opera GX Opera is a global web innovator headquartered in Oslo, Norway and listed on the NASDAQ stock exchange (OPRA). Founded in 1995 on the idea that everyone should be able to browse the web, we have spent the last 25+ years helping millions of people access the internet in a safe, private and innovative way. 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
Supabase
Zustand
React Navigation
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.
