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
Coinverter+ Crypto & Currency
Coinverter - Professional Currency & Cryptocurrency Converter
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
4 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'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 Coinverter+ Crypto & Currency: 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
Expand supported currencies and add user-customizable options
Assumption to check: Limited currency options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a feature to view historical rates and trends
Assumption to check: No historical conversion rates available
Validate with people who use this workflow before building.
Hypothesis 3
Add alert system for users to track currency changes
Assumption to check: Lack of advanced features like alerts for currency fluctuations
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to access stored conversions offline
Assumption to check: No offline functionality
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
Coinverter - Professional Currency & Cryptocurrency Converter Transform your currency conversion experience with Coinverter, the ultimate tool for both fiat and cryptocurrency conversions. Designed for professionals, travelers, and crypto enthusiasts, Coinverter delivers accurate, real-time exchange rates with a powerful yet intuitive interface. Comprehensive Currency Support: - 170+ fiat currencies with official exchange rates - Major cryptocurrencies including Bitcoin (BTC), Ethereum (ETH), and popular altcoins - Real-time price updates from trusted financial sources - Seamless conversion between fiat and crypto currencies Professional Features: - Real-time exchange rate updates with customizable refresh intervals - Advanced calculation capabilities with built-in calculator - Customizable decimal precision (0-4 decimal places) - Configurable currency symbol display - Default amount setting for quick conversions - Auto-refresh functionality with multiple interval options - Rate history tracking for informed decisions User Experience: - Clean, modern interface optimized for iOS - Intuitive navigation and quick access to favorite currencies - Dark mode support for comfortable viewing - Offline access to last known rates - No advertisements or in-app purchases - Regular updates and improvements Perfect For: - International business professionals - Cryptocurrency traders and investors - Frequent travelers - Financial analysts - Students and educators - Anyone requiring accurate currency conversions Technical Excellence: - Optimized performance with minimal battery impact - Secure data handling and privacy protection - Reliable API integration with major financial data providers - Regular maintenance and updates - Cross-device synchronization Download Coinverter today and experience the most comprehensive, professional-grade currency conversion solution available on the App Store. Whether you're managing international transactions, trading cryptocurrencies, or planning your next trip, Coinverter provides the tools you need for accurate and efficient currency conversion.
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
Shadcn/UI
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.
