What it does
This is a calculator utility that expands on the standard mobile experience. It provides both basic and scientific calculation modes, but its primary differentiator is a robust calculation history. Users can not only view past calculations but also edit, delete, and even recover them.
Where it shines
The app shines in its handling of calculation history. Instead of a simple, static log, it treats history as a dynamic workspace. At 00:24, a long-press gesture reveals options to edit the history, allowing for granular control. Even more impressive is the recovery feature shown at 00:31, where a long-press on the delete icon lets the user undo a deletion, adding a valuable safety net. The transition to the scientific calculator at 00:38 is also smooth, keeping advanced functions neatly tucked away until needed.
UX highlights
- Real-time Previews: The app shows intermediate results for multi-step calculations (00:12), reducing cognitive load and helping to prevent errors.
- Gesture-Based Actions: Advanced features like history editing are accessed via intuitive long-press gestures, keeping the main interface clean and simple.
- Forgiving Design: The ability to recover accidentally deleted history entries (00:31) is a thoughtful feature that builds user trust.
- Clean Information Architecture: Scientific functions are hidden by default but are easily accessible with a single tap (00:38), preventing overwhelm for users who only need basic functions.
- Simple Customization: The app offers straightforward visual personalization through a color grid (01:22), allowing users to make the app their own.
Monetization & growth
A soft paywall is accessible through a main menu option at 00:57. The paywall screen itself (01:00) presents a single "VIP" subscription offer. It uses a clear feature comparison table to communicate the value of upgrading, highlighting benefits like ad removal, real-time results, and access to more colors and sounds. This approach avoids interrupting the core user experience while still making the premium offer easily discoverable.
Who it’s for
This calculator is for students, professionals, or anyone who performs complex, multi-step calculations. Its strength lies in the detailed history management, making it ideal for users who need to track, review, or reuse previous results. People who value small UX improvements and personalization in their daily utility apps would also find it appealing.
Notes & opportunities
The "Recover History" feature is a powerful differentiator, but its discoverability is low. It's hidden behind a long-press on the trash can icon (00:31), an interaction that most users would likely not try intuitively. A one-time tooltip or a subtle hint in the UI could help more users discover this valuable safety net.