Felsius is a weather application designed to show both Celsius and Fahrenheit temperature units together at all times. Its main purpose is to eliminate the need for manual unit conversion or switching between settings, providing immediate understanding of temperature readings regardless of which scale users are familiar with.

The app features simultaneous display of °C and °F, allowing users to see both temperature scales without any configuration changes. It supports saving multiple locations for quick access to weather information across different areas. The design is minimal and clean, with no advertisements included. Widget functionality is available for convenient access to weather information directly from the home screen.

Felsius works by presenting temperature data in dual units continuously, ensuring both Celsius and Fahrenheit readings are visible simultaneously. This approach removes the cognitive load of mental calculations or searching for conversion tools when encountering unfamiliar temperature scales.

The primary benefit is instant clarity for people who need to understand temperatures in both measurement systems. It's particularly useful for expatriates living in countries with different temperature conventions, travelers moving between regions using different units, and households where family members are accustomed to different temperature scales.

The target audience includes expats, travelers, and mixed-unit households who regularly encounter both Celsius and Fahrenheit temperature measurements. The app is used daily in over 20 countries and is available on mobile platforms through official app stores.