OpenAI’s ChatGPT may be the world’s most popular chatbot app. But rival services are gaining, according to data from analytics firms Similarweb and Sensor Tower. Similarweb, which estimates traffic to websites, including chatbot web apps, has recorded healthy recent upticks in usage across bots like Google’s Gemini and Microsoft’s OpenAI-powered Copilot. Gemini’s web traffic grew to 10.9 million average daily visits worldwide in March, up 7.4% month-over-month, while daily visits to Copilot incr...