Best iPhone Widgets for Currency & Unit Conversion (2026)

The iPhone Calculator doesn't have a conversion widget, the Stocks widget doesn't do FX, and most third-party converter widgets ship something like the first version they built in 2018. If you actually convert during the day — travel, freelance invoicing, cooking, engineering — picking the right widget is worth a minute of thought.

Here's what to look for, and the apps that get it right.

What makes a converter widget good

• One-tap to the pair you actually use. A widget that opens a "pick a category" screen has missed the point.
• Visible value, not just a launch button. The whole point of a widget is glanceability — you should see the current rate or the last conversion without opening anything.
• Live rates that don't lie. Currency and crypto widgets must show a last-updated timestamp. If it doesn't, treat the number as decorative.
• Honors Dynamic Type and Reduce Motion. A widget that's unreadable at large text sizes (or that animates on a Reduce Motion device) wasn't actually tested by its developer.
• Standby and Lock Screen support. iOS 17 added StandBy and richer Lock Screen widgets. Two years later, most converter apps still haven't shipped them.

Apple's built-in options

There aren't any. The stock Calculator app added a conversion pane in iOS 18 — see our breakdown of what the iOS 18 Calculator still can't do — but Apple doesn't ship a converter widget. You need a third-party app.

Third-party converter widgets worth a slot

UnitPanda

Our app, so call this a biased recommendation, but the design brief was specifically "widget-first." Pick a unit pair or currency pair in settings, drop the widget on the Home Screen, and the current rate is visible without opening anything. Tap-through goes directly into the converter pre-filled with that pair. Supports Lock Screen and small/medium/large Home Screen sizes, honors Dynamic Type, no ads.

When it's fine to use a web page

If you only need to convert once a week, you do not need a widget. A Safari bookmark to Google or to a converter site is free and you'll never miss the widget. The widget question only matters if you convert often.

What to avoid in a widget

• Ads inside the widget itself. Some "free" converter apps actually render banner ads in the widget. The system caps how often a widget refreshes — wasting that refresh on an ad is unforgivable.
• Rates with no timestamp. If a currency widget shows a number with no indication of when it was last fetched, assume it's stale. Currency markets move fast.
• Permission requests for tracking. A converter app should not need your IDFA. If the App Tracking Transparency prompt fires the first time you launch it, that's a flag.

Setup tips that actually help

1. Pick your two most-used pairs first. Most people have exactly two: one currency pair (home → destination) and one unit pair (ft → cm, °F → °C, kg → lbs, etc.). Don't waste widget slots on units you convert twice a year.
2. Put them where your thumb naturally lands. Top-left of the first Home Screen page if you're right-handed and use the phone single-handed; second page if your first page is sacred. The mistake is dropping them at the bottom of page three.
3. Use a Lock Screen widget for travel. Flying home? The Lock Screen widget gives you the rate without unlocking, which is the whole point when you're tired in an airport.

The bottom line

Converter widgets aren't glamorous, but for people who do this more than weekly they're the single biggest UX improvement you can stack onto an iPhone Home Screen. Pick an app that takes widgets seriously, set up the two pairs you actually use, and stop hunting for the converter pane.