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
Cryptocurrency Exchange Rates
This app displays and monitors latest prices of the top 100 most valuable cryptocurrencies.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
72 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 Cryptocurrency Exchange Rates: 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
Include a wider selection of cryptocurrencies and tokens.
Assumption to check: Limited cryptocurrency options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate advanced charting features for better price trend analysis.
Assumption to check: No advanced charting tools for analysis
Validate with people who use this workflow before building.
Hypothesis 3
Implement real-time data updates for live pricing.
Assumption to check: Occasional data refresh delays
Validate with people who use this workflow before building.
Hypothesis 4
Enhance currency conversion with multi-currency support.
Assumption to check: Lack of detailed currency conversion 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
This app displays and monitors latest prices of the top 100 most valuable cryptocurrencies. Some features of the application include: - Real-time price monitoring - Convenient widget for viewing cryptocurrency rates without entering the application (over 1500 cryptocurrencies to choose from) - Detailed graphs over 24 hours, a week, a month, 6 months, and a year - Drag your finger across the graph to view the crypto price at a precise date - Conversion of cryptocurrencies to different currencies Some of the supported cryptocurrencies include: Bitcoin, Ethereum, Ripple, Litecoin, Ethereum Classic, Dash, NEM, IOTA, Monero, Stratis, BitShares, Zcash, EOS, BitConnect, Steem, Waves, Veritaseum, AntShares, Gnosis, Bytecoin, Golem, Siacoin, Iconomi, Dogecoin, Lisk, Augur, Tether, Stellar Lumens, MaidSafeCoin, Byteball, Factom, Decred, Status, GameCredits, DigiByte, Komodo, Ardor, MCAP, DigixDAO, PIVX, TenX, Basic Attention Token, Bancor, Nxt, SingularDTV, BitcoinDark, Aragon, SysCoin, MobileGo, FirstBlood, Ark, Peercoin, Lykke, Edgeless, LEOcoin, FunFair, Ubiq, Nexus, Verge, Round, ReddCoin, DECENT, Asch, Emercoin, MonaCoin, Namecoin, Melon, Soarcoin, CloakCoin, Numeraire, Wings, DubaiCoin, Storjcoin X, LBRY Credits, Peerplays, iExec RLC, Xaurum, Etheroll, Omni, BitBay, Gulden, vSlice, Counterparty, Quantum Resistant Ledger, OBITS, Elastic, ZCoin, Storj, Synereo, BlackCoin, Quantum, SIBCoin, Skycoin, PotCoin, YbCoin, Humaniq, Viacoin, Blocknet, Mysterium, WeTrust.
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
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Expo
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BUILD KIT DIFFICULTY
Intermediate
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.
