Elk Currency Converter

What it does

Elk is a fast and simple currency converter for iOS. Its main focus is on gesture-based interaction, allowing users to quickly see conversions for different amounts by swiping. It also includes premium features like setting custom rates and creating wallpapers with exchange rate tables.

Where it shines

The app shines in its simplicity and interaction design. The initial onboarding (00:00 - 00:14) is a brilliant example of teaching by doing, using interactive overlays instead of a separate tutorial. The way values scale up and down with a simple swipe is fluid and intuitive. Another clever feature is the wallpaper creator (01:44), which extends the app's utility beyond active use.

UX highlights

The core interaction model of swiping to multiply values is unique and fast.
Tapping a row (00:08) elegantly reveals more granular, in-between values without leaving the main screen.
The onboarding is contextual, teaching gestures directly on the live interface.
The app feels lightweight, with minimal UI chrome, focusing entirely on the numbers.
Premium features are clearly marked with a lock icon (00:49) before triggering the paywall.
Integration with system features like Siri Shortcuts (02:20) adds another layer of utility.

Monetization & growth

Monetization is handled through a premium subscription, unlocked via a paywall (00:50). This paywall is not shown on launch but appears contextually when a user tries to access a pro feature like "Set Custom Rate." The offer includes a monthly and an annual plan, with the annual option highlighted with a "58% OFF" discount and a 3-day free trial. The app also uses a standard in-app rating prompt (02:11) to encourage App Store reviews.

Who it’s for

Elk is designed for frequent travelers, expatriates, or anyone who needs to check currency conversions quickly and often. Its gesture-based model is ideal for one-handed use and getting a quick estimate without typing. The wallpaper feature would appeal to users who need to keep an eye on specific exchange rates throughout the day.

Notes & opportunities

The app's strength is its focused simplicity. However, the menu at the bottom (toggled by tapping the currency code at the top) could be more discoverable. The wallpaper feature is powerful, but its access permission flow (02:04 - 02:09) feels a bit clunky with multiple system prompts. Simplifying this could make a great feature even more accessible.