Core Features:

Basic and Scientific Calculations: In addition to basic mathematical operations like addition, subtraction, multiplication, and division, it also has scientific functions like sine (sin), cosine (cos), tangent (tan), logarithm (log, ln), square root (√), and power (x^y).

Live Preview: While performing a calculation, you can see a live result at the bottom of the display as you type.

Responsive Design: It is designed to work well on both mobile and desktop devices.

Additional Functionality:

Currency Converter: There is a built-in currency converter that allows users to convert amounts between currencies of different countries. It fetches live exchange rates from a public API.

History Tracking: A list of all your calculations is saved, which you can view and use later.

Admin Panel: There is a secure admin panel, powered by Firebase. Through this, various features of the app (e.g. - Currency Converter, Scientific Mode) can be controlled remotely, and even app-wide notices can be shown to users.

App Update Notification: There is an update notification system to inform users about new versions of the app from the admin panel.

Customization & User Experience:

Multiple Themes: Users can choose different themes according to their preference, such as - Light, Dark, Retro, Oceanic, Sakura and Glass (looks like glass).

Multiple Languages: The calculator can be used in English, Hindi and Bengali.

Quality Settings: Users can change the graphics quality (Low, Average, Good, High) according to the capabilities of their device, which improves the performance of the app.

Touch Sound: An optional sound effect can be turned on or off when a button is pressed, and its volume can also be controlled.

Privacy: No personal user information or calculations are sent to the server; all data (e.g. - history, themes) is stored locally in the browser.

All these features have turned a simple calculator into a powerful and user-friendly tool.