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
OKX: Buy Bitcoin BTC & Crypto
OKX is the new money app where your money moves at the speed of crypto
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
22,394 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 included17 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 OKX: Buy Bitcoin BTC & Crypto: 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 more diverse payment methods including PayPal, bank transfers.
Assumption to check: Limited payment options for purchasing crypto
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation and provide guided tutorials.
Assumption to check: Complex user interface for beginners
Validate with people who use this workflow before building.
Hypothesis 3
Implement in-app chat support for immediate assistance.
Assumption to check: Slow customer support response times
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a fee comparison feature for users to find the best rates.
Assumption to check: High transaction fees
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
OKX is the new money app where your money moves at the speed of crypto. It's the world-leading crypto exchange trusted by 100+ million users globally in 160+ countries to buy, sell, and trade Bitcoin, Ethereum, and a wide range of cryptocurrencies with ease and top-tier crypto security. Winner of the 2023 'Most Reliable Tech' award by TradingView. OKX gives you powerful trading and account tools to monitor and manage all your digital assets. Discover, mint, create, and swap collectibles, Ordinals, and inscriptions, with zero fees for traders and crypto creators. Find the best crypto and bitcoin (BTC) prices across all major marketplaces. Experience blazing-fast swaps and quotes for the market-leading crypto price discovery across 500 decentralized exchanges. Deep liquidity at speed for the best crypto prices on the market, quoted in milliseconds, 24/7. One app. Many possibilities: ● Buy and sell bitcoin (BTC) and crypto in just a few taps with competitive fees and 100+ accepted currencies. ● Easy token discovery from thousands of digital assets, including bitcoin (BTC), Ethereum (ETH), Ripple (XRP), Tether (USDT), Solana (SOL), Dogecoin (DOGE), BNB and Shiba Inu (SHIB). ● Manage CEX and DEX in one app. Trade offchain and onchain, and track everything from one portfolio. ● Money never sleeps with crypto staking. Earn up to 4.1% APY on 1:1 USD-pegged USDG held on OKX. ● Simple and advanced trading and charting tools for bitcoin (BTC) and crypto. ● Move money from crypto exchange to your wallet in just a few taps. ● Web3 at your fingertips with DeFi and DAOs. Funds are Secured on OKX: ● 1:1 Reserves: Every dollar in customer deposits is backed by a dollar in assets (1:1 reserve ratio) so your money is always available. ● Security you can trust: A independently audited, Proof of Reserves verified, self-custody optional, and trusted by 100M+ users globally. ● Advanced Trading Tools: Analyse the markets with detailed technical analysis, live order books, and pro-trader charting tools, all powered by TradingView. ● Automate your strategy: Trading bots run 24/7 — set up Spot Grid and Spot DCA in a few clicks. Opportunities Unlimited: ● Thousands of spot trading asset opportunities in one app. ● Competitive tight spreads with low, transparent fees. ● Analyse the markets with detailed technical analysis tools, advanced live order books, and pro-trader charting tools, all powered by TradingView. Trade all the Popular Assets: Bitcoin (BTC), Ethereum (ETH), Solana (SOL), Cardano (ADA), Bitcoin Cash (BCH), OKC Token (OKT), Dogecoin (DOGE), Polkadot (DOT), Tether (USDT), BNB (Binance Coin), Avalanche (AVAX), Polygon (MATIC), Litecoin (LTC), Chainlink (LINK), Ethereum Classic (ETC), Stellar Lumens (XLM), Uniswap (UNI), Tron (TRX), Algorand (ALGO), Filecoin (FIL), Cosmos (ATOM), Monero (XMR), AAVE, USDC, Shiba Inu (SHIB), Tezos (XTZ), Bitcoin SV (BSV), Ripple XRP, Uniswap (UNI), Decentraland (MANA), SAND, Hedera Hashgraph (HBAR), Axie Infinity (AXS), Near Protocol (NEAR), Maker (MKR), Stacks (STX), PEPE COIN, Bitcoin Ordinals BRC-20, WorldCoin (WLD), Wall Street Memes (WSM) and thousands more. Global Presence, Local Support OKX has a presence on all four corners of the globe with support available in your timezone and language. Reach our 24/7 online support. ABOUT OKX OKX is the new alternative to discovering the biggest digital asset opportunities powered by all the latest tools and technologies to help you win in the markets. Disclaimer: Not an offer/solicitation to buy, sell, or hold digital assets, which are subject to volatility & not FDIC-insured. Not financial/investment advice. Not all services and products offered in all regions, including certain states in the US, and may be restricted depending on the state in which you reside. Address: One Sansome Street, Suite 3500, CA 94104
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
Chart.js
React Navigation
React Native Paper
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.
