Musk’s Grok has seen a notable drop in users across both mobile and web platforms between March and April 2026, even as competing AI chatbots continued to grow strongly, according to data from Similarweb.

The chatbot, which is available as a standalone app, website, and through X, recorded a sharp fall in usage and has fewer users than at the start of 2026.

In January, Grok ranked second globally among AI chatbot apps in terms of average daily active users, behind ChatGPT.

However, by April, it had fallen to fifth place, overtaken by Claude, Gemini and DeepSeek.

On mobile, Grok’s average daily active users fell from 13.9 million in March to 12.2 million in April, a 12.5% month-on-month decline.

In the United States, usage dropped from 1.4 million to 1.1 million over the same period, a 15.6% fall.

On the web, Grok also declined, with global daily visits falling from 10.5 million in March to 9.3 million in April.

US web traffic similarly dropped from 2.3 million to 2.1 million.

By contrast, rival platforms saw strong growth. Claude’s global mobile users rose from 16 million to 23 million, while Gemini increased from 12.4 million to 14.8 million.

On the web, Claude surged from 19.8 million to 27.5 million daily visits, while Gemini rose from 83.7 million to 92.1 million.

Despite the short-term decline, Grok’s overall usage remains higher year-on-year, with web visits up 42.4% and mobile users up 83.5% compared to April 2025. However, competitors have posted far stronger growth rates.

ChatGPT continues to dominate the AI chatbot market.

In April, it recorded 244.9 million average daily mobile users, far ahead of Claude, Gemini, DeepSeek and Grok.

It also led web traffic with 183.7 million daily visits, roughly double Gemini’s figures.

The fluctuations in Grok’s user base come amid reports of product changes, subscription limits, and internal challenges at xAI, which is led by billionaire Elon Musk.

Separately, Musk has been involved in an ongoing legal dispute with OpenAI CEO Sam Altman over the company’s structure and founding mission, further highlighting tensions among major players in the AI industry.