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
CoinStats: Crypto Portfolio
Track every coin, wallet and exchange in one place
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
86,090 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 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 CoinStats: Crypto Portfolio: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Track every coin, wallet and exchange in one place. CoinStats is the leading crypto portfolio tracker: connect 300+ wallets and exchanges, see your real-time profit & loss, and get AI-powered insights on what you actually hold. Perp Trade History included: track your perpetual futures positions alongside spot and DeFi. ONE PORTFOLIO, EVERY ASSET Connect MetaMask, Phantom, Trust Wallet, Binance, Coinbase or any of 300+ wallets and exchanges, or simply paste a wallet address. Bitcoin, Ethereum, Solana and every EVM chain sync automatically, so your CeFi and DeFi holdings live on one screen. REAL-TIME PROFIT & LOSS See what you actually made. Realized and unrealized P&L, all-time and per asset, cost basis, and portfolio performance over any period. No spreadsheets. AI INSIGHTS Ask AI about your portfolio, any coin or the market and get answers grounded in your real holdings and live data. PERPETUAL FUTURES Your perp trades, in your portfolio. Full trade history with filters, search and trade-level detail, side by side with spot. LIVE PRICES FOR 20,000+ COINS Real-time prices, charts, market cap, volume and trending coins from multiple sources. Convert between any two assets instantly. INSTANT & CUSTOM ALERTS Set price, volume or market-cap alerts on any coin, or let Auto Alerts notify you the moment something moves. TAX REPORTING Export your full transaction history for tax season: every trade, transfer and swap across all connected accounts, ready for your tax tool or accountant. CRYPTO NEWS FROM 140+ SOURCES All the news in one feed, tagged to the coins you hold. WIDGETS & APPLE WATCH Your portfolio and live prices on the Home Screen, Lock Screen and your wrist. DEFI, EARN & MORE Monitor DeFi positions across protocols, earn on your holdings, and keep your NFTs in view too, all from the same app. CoinStats Premium unlocks the full set of portfolio and market insights. - Payments will be charged to your iTunes account at confirmation of purchase - CoinStats Premium costs $13.99 monthly, $167 annually (prices can vary depending on your country) - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase - Your subscription will automatically renew unless you have turned off auto-renewal at least 24 hours before the end of the current period - When your subscription auto-renews, the same iTunes account as the initial purchase will be charged the same amount as the initial purchase - After canceling your subscription, your subscription will remain active until the end of the purchased period - Terms of Use: https://coinstats.app/terms.html - Privacy Policy: https://coinstats.app/privacy.html
Written user reviews are not shown here. Check current App Store reviews >
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
Implement a more streamlined navigation experience with clear visual cues.
Assumption to check: Users often find it difficult to navigate between multiple screens.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce automatic transaction syncing with exchanges.
Assumption to check: Manual input for transactions can be cumbersome.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize their dashboard layout and widgets.
Assumption to check: Limited customization options for portfolio views.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance real-time data updates and alerts for significant price changes.
Assumption to check: Pricing data may not always be up-to-date.
Validate with people who use this workflow before building.
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
react-native-chart-kit
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.
