Calculator:Math Solver

What it does

This is a multifaceted calculator application that extends far beyond basic arithmetic. It serves as a comprehensive tool for users who need to not only perform calculations but also track, manage, and annotate them. Key features include a detailed calculation history, a scientific calculator, a real-time currency converter, and extensive options for visual customization.

Where it shines

The app's main strength is its transformation of the standard calculator history into an interactive ledger. At 01:32, the user demonstrates the ability to long-press any calculation and add a custom note, effectively labeling expenses or steps in a problem. This, combined with features like "Segmented Sum" (01:24), elevates the app into a lightweight bookkeeping tool. The seamless integration of a currency converter (02:59) further broadens its utility for travel or international business.

UX highlights

Contextual History Actions: Long-pressing any line in the history (01:16) reveals a powerful menu for adding notes, copying values, or deleting entries. This is a smart use of a common gesture to add deep functionality.
Clear Calculation Display: The app maintains a clean, readable history tape at the top of the screen, providing constant context for ongoing calculations.
Accessible Advanced Modes: Switching between the basic calculator, scientific mode (02:05), and currency converter (02:50) is handled through a clear menu, keeping the primary interface uncluttered.
Extensive Personalization: The app offers deep customization, from applying entirely new background images (04:33) to changing the color scheme of the calculator keys (04:42).
Granular Settings: Users can control details like keyboard click sounds (04:20) and the number of decimal places (04:48), allowing for a highly tailored experience.

Monetization & growth

The app employs a direct monetization strategy from the start. After a brief, four-panel feature tour, a paywall appears at 00:09, offering a 3-day free trial for a premium subscription. This suggests a confidence in the value proposition showcased in the onboarding. Later, in the settings menu (04:09), a more detailed subscription page reveals three tiers: yearly, monthly, and weekly, catering to different user commitment levels. The app also encourages positive App Store engagement by triggering a native rating prompt (00:34) immediately after a successful subscription, capitalizing on a moment of high user satisfaction.

Who it’s for

This calculator is designed for users whose needs go beyond simple, one-off calculations. Its feature set is well-suited for students who need to document their work, small business owners tracking daily expenses, freelancers managing project costs, or anyone who regularly performs calculations they need to reference or categorize later. The currency converter also makes it valuable for travelers and international shoppers.

Notes & opportunities

While powerful, the app has a few areas for refinement. The transition between different toolsets (like calculator to currency converter) involves a loading screen (02:51), which could feel smoother. The privacy policy (04:56) opens in what appears to be an embedded web view, which can be a slightly jarring experience compared to a native screen. Finally, the scientific calculator layout (02:06) is quite dense, and could potentially benefit from improved visual hierarchy to make functions easier to find.