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
Phantom: Trading Wallet
Phantom is where you buy, trade, and hold crypto, all in one place
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
64,210 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 Phantom: Trading Wallet: 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
Provide clear fee breakdown before confirming transactions.
Assumption to check: Users report difficulty in understanding transaction fees
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate a wider range of supported tokens.
Assumption to check: Limited support for some cryptocurrencies
Validate with people who use this workflow before building.
Hypothesis 3
Implement advanced security options like multi-signature wallets.
Assumption to check: Users desire better security features
Validate with people who use this workflow before building.
Hypothesis 4
Optimize asset list rendering and loading times.
Assumption to check: Performance issues with large asset lists
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
Phantom is where you buy, trade, and hold crypto, all in one place. Trusted by 20M+ users across Bitcoin, Ethereum, Solana, and more. New to crypto or deep in it, Phantom is built for how you actually move. Check out our products like the built-in swapper, token chat, explore tab, and more. Explore the crypto ecosystem in a wallet that you can trust. It’s easy to get started. Create an account with your email, fund your wallet, and start trading in seconds. Buy, Sell, Trade, and Manage Crypto - Buy Bitcoin, Ethereum, Solana, and thousands of tokens - Swap across multiple chains: Bitcoin (BTC), Ethereum (ETH), Solana (SOL), Polygon (POL), Base, and HyperEVM (HYPE) - Make on-chain swaps with ease in a simple UI - Explore trending tokens and follow top traders’ wallets - Stake your SOL with a couple taps Security You Can Trust - Stay secure with biometric authentication - Self-custody wallet — your keys, your crypto - Self-custodial wallet means you control your funds - Independently audited - 24/7 global support Explore - Discover and track trending tokens across categories like AI, Majors, and Top Volume - Follow top traders' wallets and spot moves early - Stay up to date with real-time earnings and market events - Hop into the token chat to catch the conversation and watch live trades Phantom Cash - Send and receive money instantly - Swap crypto to cash with no fees on stablecoins - Move money fast
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
Zustand
axios
@react-navigation/native
@react-native-qr-svg
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.
