AccuWeather offers weather forecasts and warnings, as well as other weather products and services.

Accuweather is a reputed company that provides expert weather data services. It was founded in 1962. It has grown and expanded its services since then. Its core capabilities include SkyGuard's Severe Weather Warnings, Forecasting, Forensic Meteorology, Data and Analytics. 
Its objective is to turn weather data into insightful and actionable opportunities for businesses. It has worked with various industries such as manufacturing, retail, financial services, energy, insurance, healthcare, transportation and forensic meteorology.
Its business weather experts are available 24x7 for support and consultation. By using its technology and features, Accuweather also provides an effective advertisement strategy and welcomes partnerships as well. 
Accuweather is used all over the globe. It has proven beneficial to warn people and businesses of various dangers and take intelligent, emergency action to avert disaster and loss. It is well known for ‘The Accuweather Challenge’, ‘AccuWeather Now’ and ‘RealFeel temperature’.

AddThis is a privately held company founded in 2004. It is an industry leader in the field of website marketing tools. It works on an artificial platform known as the AddThisAudience Intelligence platform. It offers a wide range of share buttons such as share buttons and follow buttons.
Its share buttons include a floating share bar, inline share buttons, extending share buttons and a share button popup. Its follow buttons are available for free and can be customized and used for analytics as well. AddThis also provides a link promotion popup and slider along with a list building popup and slider. It is available as a CMS plugin for popular platforms like WordPress.

Comparison AccuWeather vs AddThis