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
Binance.US - Buy Crypto & BTC
Binance.US is a leading crypto exchange trusted by millions of customers in the U.S
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
111,051 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 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 Binance.US - Buy Crypto & BTC: 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
Offer transparent fee structures and a fee calculator.
Assumption to check: Users often find transaction fees to be unclear or high.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance security features, such as two-factor authentication.
Assumption to check: Security concerns around linking bank accounts.
Validate with people who use this workflow before building.
Hypothesis 3
Provide educational resources and risk assessment tools.
Assumption to check: Difficulties in understanding cryptocurrency volatility.
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate chat support and extensive FAQs.
Assumption to check: Limited 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
Binance.US is a leading crypto exchange trusted by millions of customers in the U.S. Securely buy and trade bitcoin and 190+ cryptocurrencies, including BTC, ETH, SOL, XRP, Dogecoin, and BNB, with low trading fees, powerful tools, and staking rewards. Whether you're new to crypto or an active trader, Binance.US gives you an easy way to access bitcoin and altcoins from one secure app. BUY, SELL & TRADE 190+ COINS - Easily buy and sell crypto using bank transfer - Link a bank account to deposit and withdraw USD with zero fees - Trade Bitcoin (BTC), Ethereum (ETH), Solana (SOL), XRP, Dogecoin (DOGE), Cardano (ADA), BNB, Polygon (MATIC), Avalanche (AVAX), Ethereum Classic (ETC), Stellar Lumens (XLM), and more LOW-FEE CRYPTO EXCHANGE - Start your crypto portfolio in as little as two minutes - Trade BTC, ETH, SOL, XRP, BNB, and more with low fees - Use live charts, real-time order books, and advanced tools to trade crypto with confidence STAKE CRYPTO AND EARN REWARDS - Start staking crypto to support your favorite projects while earning rewards - Stake 20+ cryptocurrencies, including ETH, SOL, ADA, BNB, and many of the largest Proof-of-Stake assets - Discover new altcoin opportunities and stay close to the latest DeFi and Web3 trends EASY FOR BEGINNERS, POWERFUL FOR EXPERIENCED TRADERS - Download the Binance.US app for a fast, simple, and secure way to buy bitcoin and trade crypto - Schedule recurring buys and grow your crypto holdings over time with Auto-buy - Learn as you go with helpful tooltips, cryptocurrency descriptions, and market headlines GET MORE WITH BINANCE.US - Buy and sell crypto instantly in just a few taps - Convert between cryptocurrencies with zero transaction fees. A spread applies when converting crypto. - Set price alerts so you never miss an opportunity ADVANCED CRYPTO SPOT TRADING - Power your trades with an advanced interface built for seasoned crypto traders - Access candlestick charts, technical analysis indicators, and real-time order book information - Place market, limit, stop-limit, trailing stop, and OCO orders to manage risk and get more from every trade - Execute complex trading strategies on the go with low fees and strong price discovery INDUSTRY-LEADING SECURITY - Trade with confidence on a crypto platform designed to help customers securely store their crypto - Customer assets are held on a 1:1 basis, so you can access your funds anytime - Binance.US maintains world-class accreditations and certifications, including a completed SOC 2 Type II audit, ISO/IEC 27701 and ISO/IEC 27001 accreditation, as well as compliance with PCI DSS standards REAL-TIME CUSTOMER SUPPORT - Connect with customer support agents anytime, anywhere, right from the Binance.US mobile app or website - Get real-time answers with live chat - Find helpful tutorials, how-to guides, and answers to common questions in the Support Center TRADE & TRACK 190+ CRYPTOCURRENCIES - Buy, trade, convert, and track over 190 popular cryptocurrencies including Bitcoin, BTC, ETH, SOL, XRP, Dogecoin, BNB, HYPE, ADA, LTC, SHIB, MATIC, AVAX, ETC, XLM, HBAR, USDT, ALGO, LRC, MANA, USDC, LINK, DOT, BCH, XTZ, and more.
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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
React Navigation
Axios
React Native Reanimated
BUILD KIT DIFFICULTY
Expert
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.
