App Overview

Currency – Minimal Converter icon

Currency – Minimal Converter

Nuno Coelho Santos · Travel

Currency is the fastest, simplest way to convert money on iPhone and iPad.

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
276 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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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.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Currency – Minimal Converter: 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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App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

Screenshots

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App Store description

Currency is the fastest, simplest way to convert money on iPhone and iPad. Designed for iOS 26 with a stunning Liquid Glass interface, Currency 2 is a complete reimagining of the app loved by users worldwide. Convert: Type an amount and see it convert instantly. No tapping required. Currency updates live exchange rates automatically, and works fully offline with the last fetched rates when you don't have a connection. Calculate: Need to split a bill or apply a markup? Just type the math. Currency understands full expressions like 150 + 20% or 49.99 × 3, calculates the result, then converts it all at once. Scan: Point your camera at any number—a price tag, receipt, menu, or screen—and Currency reads it for you. No typing needed. Tap to confirm and your conversion is instant. Draw: Can't remember a currency code? Draw its symbol on screen. Currency uses on-device machine learning to recognize what you drew and jump straight to it. Works for dollar signs, yen, euros, and dozens more. Nearly 300 Currencies: • 170 world currencies with live rates. • 77 cryptocurrencies including Bitcoin, Ethereum, and more. • 46 fictional currencies from Middle-earth, Star Wars, Pokémon, and 46 other universes. Private by Design: Currency never tracks you. There are no accounts, no sign-ins, and no analytics. Exchange rate data is fetched from a dedicated server that logs nothing. Your conversions stay on your device. Built for the World: Available in more than 50 languages. Respects your locale's number format, decimal separators, and currency symbol placement. Right-to-left languages fully supported. And of course: • Live exchange rates, refreshed hourly. • Works offline with cached rates. • Copy any result to clipboard. • Landscape, iPad, and iPhone Duo layouts. • No ads.

Written user reviews are not shown here. Check current App Store reviews >

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 exchange rate sources.

Assumption to check: Limited currency options compared to competitors.

Validate with people who use this workflow before building.

Hypothesis 2

Add a feature to view historical rates.

Assumption to check: No historical data for exchange rates.

Validate with people who use this workflow before building.

Hypothesis 3

Implement a modern UI with animations and better UX.

Assumption to check: Basic UI design may feel outdated.

Validate with people who use this workflow before building.

Hypothesis 4

Provide onboarding tutorials to enhance user experience.

Assumption to check: Lack of in-app tutorials or guides.

Validate with people who use this workflow before building.

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
expo-location
BUILD KIT DIFFICULTY
Starter

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.