For the better part of two years, ChatGPT was the AI chatbot market. That era appears to be over.
OpenAI’s flagship product saw its US mobile app daily active user share drop to 38.7% in March 2026, according to data from Apptopia. That’s down from 69.1% in January 2025. In roughly 14 months, ChatGPT went from commanding more than two-thirds of daily engagement to less than two-fifths.
The numbers tell a clear story
ChatGPT still leads in absolute terms. The platform maintains around 1 billion monthly users. Google’s Gemini now claims roughly 662 million monthly users. Anthropic’s Claude sits at 245 million.
Gemini’s daily active user share climbed to 25.2% in March 2026, up from 14.7% previously.
