What it does
Elk is a currency converter designed for speed and simplicity. The app replaces the traditional calculator interface with a gesture-driven system. Users can instantly see a table of converted values and use swipes to rapidly scale the amounts up or down by powers of ten, making it easy to estimate conversions for both small and large sums.
Where it shines
Elk's design philosophy shines in its core interaction model. The swipe-to-scale gesture (00:03) is incredibly fast and intuitive for anyone who needs a quick estimate without typing. The second standout moment is the tap-to-drill-down gesture (00:11), where tapping the space between rows reveals more granular decimal values. This is a clever way to manage information density. Finally, the ability to create a custom wallpaper with a conversion table (01:43) is a unique feature that extends the app's utility beyond its own screens.
UX highlights
- Gesture-first interface: Swiping left and right to multiply or divide by ten is the primary way to interact, making the app feel fluid and fast.
- Progressive disclosure: The app shows whole numbers by default and reveals decimal precision only when the user taps, keeping the main view uncluttered.
- Zero-friction start: The app opens directly to the converter with no sign-up or mandatory tutorial, providing instant value.
- Minimalist aesthetic: The dark-themed, text-focused design removes all distractions, focusing solely on the numbers.
- Clever interactions: Tapping between rows to show more detail is an inventive use of negative space as an interactive element.
- Contextual onboarding: A simple overlay at 00:00 teaches the core gestures in seconds and then disappears permanently.
Monetization & growth
Monetization is handled through a premium subscription, which is presented via a soft paywall. When a user attempts to access a pro feature like setting a custom rate (00:48), a paywall appears. The paywall at 00:50 offers two plans, Monthly and Annual, with the Annual plan highlighted with a "58% OFF" discount and a 3-day free trial. The feature list is clearly presented, outlining the benefits of subscribing. This model allows users to experience the core app for free while effectively upselling power users.
Who it’s for
Elk is ideal for frequent travelers, international shoppers, or finance professionals who need to perform quick currency estimations regularly. Its speed and one-handed usability make it perfect for on-the-go situations where typing on a traditional calculator would be cumbersome. The wallpaper feature also caters to users who want passive access to exchange rates throughout their day.
Notes & opportunities
The app's core strength is its opinionated, minimalist design. However, the reliance on undiscoverable gestures might pose a slight learning curve if the initial tutorial is missed. The settings and extra features like Siri shortcuts are somewhat hidden behind a small icon at the top of the screen. Promoting the unique wallpaper feature more prominently could be an opportunity to better communicate the value of the premium subscription upfront.