Kaeru Kaeru

What's Coming

Kaeru is now available on the App Store. Here's everything in v1.0 — and what we're building next.

Available on App Store
iOS Platform iPhone · iOS Platform Apple Watch · Widgets

Shipping in v1.0

Everything in the first release

Currency Converter

Instant conversion between 50+ world currencies with real-time rates. Drag slider or type to adjust amounts. Quick-amount chips for common values.

  • 50+ currencies across all major regions
  • Real-time rates from open-source currency API
  • Drag control with haptic feedback
  • Quick amounts: $1, $5, $10, $50, $100…

100% Offline Support

Cached rates let you convert anywhere — on a plane, in a remote area, or wherever you have no signal. Your last fetched rates are always available.

  • Rates cached on-device after each fetch
  • No connection required to convert
  • Cache timestamp shown in the UI

Multi-Output Mode

See your amount converted into all your favorite currencies simultaneously — perfect for comparison shopping while traveling.

  • All favorites shown at once
  • Same amount, all your pairs, one screen

Conversion History

Your last 100 conversions saved automatically. Review past calculations and pick up right where you left off.

  • Last 100 conversions stored on-device
  • Tap any entry to restore the amount and pair

iPhone Widgets

Widgets

Three widget sizes — small, medium, and lock screen — so your most important rate is always a glance away. No need to open the app.

  • Small widget: current rate for your favorite pair
  • Medium widget: rate + all your favorite pairs
  • Lock Screen widget: rate at a glance
  • Configurable pair via App Intents
  • Reads from local cache — no network needed

Apple Watch App

watchOS

A full standalone converter on your wrist. Rotate the Digital Crown to adjust the amount in real time. Works offline with cached rates — no iPhone needed.

  • Full watchOS 10 app — standalone, no iPhone required
  • Digital Crown to adjust amounts with dynamic step size
  • Reads from shared App Group cache
  • Always-on currency pair from your favorites

Planned

Post-launch features

Rate Alerts

Planned

Get notified when a pair hits your target

Set a target exchange rate for any currency pair and receive a notification when the live rate crosses that threshold. Useful for travelers planning ahead or anyone waiting for a good moment to exchange.

  • Per-pair target rate with above/below trigger
  • Background fetch to check rates periodically
  • Push notification with the current rate

Rate History Chart

Planned

See how a pair has moved over time

A simple line chart showing the exchange rate trend for the current pair over the past 7 or 30 days. Helps users understand if a rate is historically high, low, or average.

  • 7-day and 30-day view
  • Min / max / average labels
  • Uses historical data from the same open-source API

Exploring

Ideas for the future
Exploring

iPad App

Native iPad layout with side-by-side panels

A native iPad layout taking advantage of the larger screen — converter on the left, multi-output and history on the right.

Exploring

Siri Shortcuts

Convert currency with your voice

Ask Siri "Convert 50 dollars to euros with Kaeru" and get the result without opening the app.

Want to be first in line?

Kaeru is coming soon. Follow us or send feedback — we'd love to hear what you need in a currency converter.

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