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
Delta by etoro
Trusted by millions of investors worldwide, Delta by etoro is the #1 portfolio tracker for stocks, crypto, ETFs, and forex
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
11,363 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.
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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 Delta by etoro: map the core Finance 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
Expand to support more cryptocurrencies and exchanges.
Assumption to check: Limited asset integration options
Validate with people who use this workflow before building.
Hypothesis 2
Implement more robust error handling and data syncing.
Assumption to check: Occasional sync issues with account data
Validate with people who use this workflow before building.
Hypothesis 3
Design a more streamlined layout to enhance usability.
Assumption to check: User interface can be cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Add more detailed analytics and reporting features.
Assumption to check: Limited insights and analytics features
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
Trusted by millions of investors worldwide, Delta by etoro is the #1 portfolio tracker for stocks, crypto, ETFs, and forex. Track all your investments in one powerful app. △ Why Delta is Different △ - All Your Investments, One Place: Automatically sync with 200+ exchanges, brokers, and crypto wallets including Coinbase, Binance, Robinhood, and more - Real-Time Portfolio Tracking: Live price updates across stocks, cryptocurrency, ETFs, commodities, forex, and more - Smart Price Alerts: Get notified instantly when your assets hit target prices or make significant moves - Portfolio Analytics: Track gains, losses, asset allocation, and performance with institutional-grade charts - Backed by etoro: Trusted technology from a global leader with millions of users worldwide △ Track Everything You Invest In △ - Stocks & ETFs: Apple, Tesla, S&P 500, and thousands more - Cryptocurrencies: Bitcoin, Ethereum, Solana, and 10,000+ coins - Forex & Commodities: EUR/USD, gold, oil, and major currency pairs △ Powerful Features for Every Investor △ - Bank-Level Security: Your data is encrypted and secure - Beautiful Charts: View your portfolio performance with customizable time frames and interactive graphs - Multi-Currency Support: Track investments in USD, EUR, GBP, and 150+ fiat currencies - Sync Across Devices: Access your portfolio on iPhone, iPad, and web - Custom Notifications: Set up alerts for price targets, portfolio milestones, and market events - Benchmark Tracking: Compare your performance against the S&P 500, Bitcoin, and your own custom benchmarks △ Perfect for Every Type of Investor △ Delta adapts to your investing style. Perfect whether you're a crypto day trader tracking 100+ coins, a long-term stock investor monitoring dividend portfolios, a forex trader managing currency positions, or just getting started with your first ETF. △ Join Millions of Smarter Investors △ From beginners tracking their first Bitcoin purchase to professional traders managing complex portfolios, Delta gives you the clarity and confidence to invest better. △ Plans to Suit Every Investor: △ Delta Basic stays Free Forever Perfect for casual investors getting started: - Track up to 10 assets in your portfolio - Unlimited broker, wallet, and exchange connections - Use across 5 devices - Real-time price tracking - 3 Delta AI uses per month to generate personalized summaries and insights - Basic portfolio analytics - Price alerts and notifications Delta PRO is for Serious Investors Everything in Basic, plus: - Track up to 40 assets in your portfolio - 10 Delta AI uses per month - Asset Analytics: Dive into your assets with deep performance metrics - Auto-Refreshing Prices: No more manual refreshing; prices update automatically - "Why Is It Moving" Updates: Understand what's driving price movements with real-time news analysis - Insider Trades: Track when executives and insiders buy or sell company stock - A Selection of Portfolio Insights Modules: Check your Portfolio Diversity, Trade Statistics, Exchanges, and Worth to gain a solid understanding of your portfolio Delta PRO+ gives you Professional-Grade Power Everything in PRO, plus unlimited scale and advanced tools: - Unlimited Assets & Portfolios: Track as many investments as you want with no limits - Unlimited Delta AI uses - Real-Time Prices: Institutional-grade live data across all markets - Gains Reporting: For all your trades and transactions - All Portfolio Insights Modules: Complete access to every analytics feature - Advanced Performance Metrics △ Start Free, Upgrade Anytime △ Download Delta by etoro for free and track up to 10 assets forever. When you're ready for more power, upgrade to PRO or PRO+ with a free trial; cancel anytime, no commitments. △ Get Delta today and take control of your investments. Terms of service: https://delta.app/en/terms Privacy policy: https://delta.app/en/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.
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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.
