App Overview

eCurrency - Currency Converter icon

eCurrency - Currency Converter

Hendrik Holtmann · Travel

eCurrency is far more than an easy to use currency converter and handy calculator

$0.99 · In-app purchases

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.5
135 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.

Build your own version

Build Kit

Make this idea yours

A product spec, screen plans, and build steps for your coding agent.

First kit free with a verified email

Add to a Remix

Combine features and design from your favorite apps.

Kit ready. Verify your email to download it.

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/
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.

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.

JavaScript is required to complete mailbox verification.

Free quick prompt For a smaller starting point

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 eCurrency - Currency 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.
            

Preview ready. Verify your email to reveal and copy the full prompt.

JavaScript is required to complete mailbox verification. Return to this prompt preview.

Continue in Rork copies the full prompt to your clipboard first, then opens Rork in a new tab.

Continue in Rork >

Affiliate link: CloneChart may earn a commission at no extra cost

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 to include more currencies and real-time rates

Assumption to check: Limited currency options compared to competitors

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to set their default base currency

Assumption to check: Lack of user customization for base currency

Validate with people who use this workflow before building.

Hypothesis 3

Add a feature to save and view past conversions

Assumption to check: No history of past conversions

Validate with people who use this workflow before building.

Hypothesis 4

Simplify the in-app purchase process and clarify what features are paid

Assumption to check: In-app purchase confusion

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

eCurrency is far more than an easy to use currency converter and handy calculator. It supports over 200 popular currencies; works without active internet connection and even supports custom rates. eCurrency offers rich graphical charts for all exchange rates and supports calculations with historical exchange rates, making this the perfect tool for business, overseas travel and for anyone interested in currency trading. eCurrency offers the following features: ► Easy-to-use appealing interface ► One screen for all major functionalities ► Designated keypad for fast number entry; plus a handy built-in math’s calculator ► Configures up to 8 converters; swipe through as on the iPhone‘s home screen ► Supports over 200 currencies (for a full list see: http://bit.ly/knBkeS) ► Detailed graphical charts for all exchange rates (1-week, 1-month, 3-months, 6-months, 1-year, 2-years, and 5-years) ► Automatic setting of home currency and number formatting ► Reliable functionality: No active internet connection required ► Exchange rates automatically updated on startup (Automatic update can be deactivated to avoid roaming costs) ► Supports custom exchange rate entry ► One touch reverse currency conversion ► Special ‘shake to inverse calculation’ feature ► Select and create a list of preferred currencies for fast access ==Easy to use interface== eCurrency interface is designed for ease of use. Just start the application and type in the amount you want to convert and eCurrency converts instantly. Tap on one of the flags to change the currency you want to convert to. A built-in calculator allows for math calculations. The current exchange rate and rate change compared to the previous day is conveniently displayed in the main interface. ==Favorites Support== eCurrency supports over 200 currencies. The “Favorites” functionality allows you to define the currency pairs you use as favorites. To create a new favorite go into the “Settings” and touch the “+” Button. You can swipe through all your favorites on the main calculation interface just as you swipe the pages on the iPhone’s home screen. == Charts and Historic Rates== eCurrency provides detailed historical charts for all exchange rates. Just rotate the device to landscape, to view the chart for the active currency pair. You can switch the chart display between a 1-week, 1-month, 3-month, 6-month, 1-year, 2-year or 5-year period. Tap on the chart to display the exact exchange rate tor a particular day. Tap and hold to use a specific exchange rate for historic calculations. == Exchange Rate Updates == eCurrency updates exchange rates automatically on every start-up or on demand. You can turn off automatic updates to avoid roaming costs. The conversion and calculation functionally works completely offline using the latest downloaded exchange rates; the display of historical charts requires an active internet connection. ==Rates Provider== eCurrency is not dependant on any single data-source. The application obtains its exchange rates from our self-developed Currency-Provider-engine that aggregates rates data from multiple sources to secure the reliability of exchange rate updates. == Tutorial & Support== On the first startup a short self-running demo is displayed to introduce you to the app. We appreciate any reviews or comments you may have on eCurrency in iTunes. If you have any questions please contact us directly, as we are unable to respond to your enquiries via iTunes.

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

Screenshots

< Scroll to see more >

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/picker
zustand
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.