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
Currenzy
Currenzy is a beautiful currency converter app for daily currency conversion needs
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
166 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 included18 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 Currenzy: 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
Integrate real-time API for more currencies and frequent updates.
Assumption to check: Limited currency support and updates
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to save favorite currencies for quick access.
Assumption to check: Lack of user personalization options
Validate with people who use this workflow before building.
Hypothesis 3
Utilize multiple data sources for more accurate exchange rates.
Assumption to check: Inconsistent conversion accuracy
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the UI with modern design trends and better UX.
Assumption to check: Basic user interface
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
Currenzy is a beautiful currency converter app for daily currency conversion needs. Its unique feature automatically converts currencies on a web page through its safari extension. With Currenzy, you can convert currencies anywhere inside your iPhone or iPad, where text selection is shareable. When you are on apps like mail or notes, select the text and share it with the Currenzy app extension to see the conversion. You can use your iPhone camera to convert prices on a price tag or a hotel menu while traveling abroad. Currenzy is also privacy-conscious, so none of your data leaves your device. • Supports all major currencies. (Over 150+ World Currencies. Digital Currencies - BTC, ETH) • Safari Extension Support - the ability to currency convert in your browser • Action Extension Support helps convert currencies in all apps where text selection is possible. • Home Screen widgets • Apple Watch Support • Bookmark List • Historical Chart • Built-In Calculator • Personalized Actions - custom exchange rate, transaction fee, • Support for custom exchange rate • Can work without an internet connection • Supports Dynamic Type • Functional and easy to use • Clean Interface & Natural Gestures • Universal App - iPhone, iPad, and Apple Watch • Custom App Icon support for a personalized touch • Handoff support, start on one device and resume on another • iCloud sync • Dark and Light modes with multiple color accents • Universal purchase for all your devices • Family Sharing support • Localized in French, German, Italian, Japanese, Simplified Chinese, and Spanish Currenzy is designed to make currency conversion as simple as possible. For any feedback and suggestions, please e-mail us at [email protected]."
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
axios
react-navigation
react-native-picker
expo-linear-gradient
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.
