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
Currency Converter Free!
Currency Converter – Live Exchange Rates
$0.49 · In-app purchases
PRICE
$0.49
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 Currency Converter Free!: map the core Travel 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 more currencies and customizable favorites.
Assumption to check: Limited currency options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Add visual representations of historical exchange rates.
Assumption to check: No historical data or charts for exchange rates.
Validate with people who use this workflow before building.
Hypothesis 3
Provide more settings for customization, such as themes or notifications.
Assumption to check: Lack of in-depth settings for user preferences.
Validate with people who use this workflow before building.
Hypothesis 4
Implement offline mode to allow basic calculations without internet.
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
Currency Converter – Live Exchange Rates Fast • Accurate • Offline Mode • Multi-Currency Support Looking for a super-fast currency converter app for iPhone that gives live exchange rates, works offline, and helps you convert currencies in seconds? Meet Currency Converter – Live Rates, your simple and reliable tool for all international currency calculation needs. Whether you're a traveler, student, business owner, or crypto user, this app makes currency conversion effortless. --> Why This Is The Best Currency Converter App for iOS Designed with speed, accuracy, and simplicity — everything you need in a single place. * Live Exchange Rates (Updated Every Few Seconds) Never get outdated rates again. Perfect for travel, forex trading, and online shopping. * Convert 150+ Global Currencies Instantly USD, EUR, INR, AED, GBP, CAD, AUD, SAR, KWD, JPY, CNY, and more. * Smart Calculator Built-In Convert and calculate in one place. --> Who Should Use This App? * Travelers wanting a quick currency calculator on the go * Students studying foreign exchange or finance * Online shoppers checking international prices * Freelancers receiving payments from abroad * Forex beginners tracking real-time market changes * Traders needing fast and accurate conversion data --> Key Features at a Glance * 150+ Global Currencies * Beautiful Minimal UI * Smart Calculator * Super-Fast Performance --> Why Users Love This App Because it’s fast, accurate, and clean — no ads, no clutter, no confusion. Just a simple and powerful currency converter that works every time. --> Perfect for International Travel - Going to Dubai, USA, Europe, Singapore, or Thailand? - Check prices instantly and avoid overpaying during trips. --> Boost Your Financial Decisions Whether you're converting USD to INR or AED to USD — this app helps you compare rates and save money while paying internationally. --> Download Now & Make Every Conversion Easy Currency Converter! Your pocket-friendly global currency calculator.
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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
react-navigation
Zustand
react-native-paper
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.
