Grok’s mobile app had 93,386,567 monthly active users in October 2026, according to Similarweb estimates shared in a post on X on 9 November. Similarweb put the app’s October downloads at 12,731,752.
Similarweb’s chart labels the October change as +3.32% for monthly users and +3.57% for store downloads versus September. That implies about 90.4 million September users and about 12.3 million September downloads, by our arithmetic. The chart covers Android and iPhone worldwide.
Business Pill · Distribution Advantage
An evergreen Business Engineer explainer on distribution advantage. It teaches the general idea only and does not describe Grok or Similarweb’s data.
The key insight: Similarweb estimates Grok’s app had 93,386,567 monthly active users and 12,731,752 downloads in October 2026, up 3.32% and 3.57% on September, which implies about 90.4 million September users, by our arithmetic.
The chart, titled “Grok’s App Performance: October 2026”, compares September and October 2026 for monthly users and store downloads. October downloads equal about 13.6% of October monthly users, by our arithmetic.
In an earlier post on 14 April, Similarweb put Grok’s monthly active users at 63.86 million in January, 61.94 million in February and 65.69 million in March 2026. On those figures, October’s 93.4 million is about 42% above March, by our arithmetic, assuming the two posts measure the same way. Similarweb’s April post does not state its platform scope.
Grok app monthly active users, Similarweb estimates: January to March 2026 from Similarweb’s 14 April post, October 2026 from its 9 November post. September is derived from Similarweb’s stated +3.32% change (our arithmetic). April to August not shown.
Similarweb posted on 9 November its estimates for Grok’s app in October 2026: 93,386,567 monthly active users and 12,731,752 downloads. Its chart compares September and October and covers Android and iPhone worldwide. These are Similarweb’s estimates, not figures reported by xAI.
The Same Day as the Grok Bot Fix
The figures landed hours after Elon Musk said he did a round table review with the Grok Bot engineering team and that fixes were being implemented overnight, as we reported in Musk Promises Overnight Grok Bot Fix After Usage Complaints. Similarweb’s October numbers predate that post.
As we read Similarweb’s figures, Grok’s app usage sits well above the 63.86 million to 65.69 million Similarweb estimated for January to March, about 42% above March by our arithmetic, though Similarweb’s April post does not state its platform scope.
Similarweb, post on X, 9 November 2026
“Grok’s app in October 2026: – 93,386,567 MAUs – 12,731,752 downloads”
Three Implications
FOR READERS TRACKING AI APPS These are Similarweb estimates for Android and iPhone worldwide, not figures reported by xAI.
FOR THE GROK PRODUCT October downloads equal about 13.6% of October monthly users, by our arithmetic from Similarweb’s figures.
The framework says: “The labs are running a fat-tail trade where the casual masses cross-subsidize the power users, and the power users deliver the strategic asset.”
As we read it, a 93.4 million monthly-user app is the casual-mass side of that trade, while tools like Grok Bot serve the heavier users.
Update (9 Nov): Musk amplifies a user story.Elon Musk wrote “Grok @Bot can do incredible things” in a post on X at 15:41 UTC on 9 November, quoting another user’s account of using Grok Bot. The post had 4,290,259 views when we read it at 17:24 UTC. The user claimed that Grok Bot helped them set up an open-source tool called Chasing Your Tail, which its public GitHub repository describes as a “Tool for using wireless signals to see if you’re being followed”, and that its logs became an exhibit in a personal court case. We could not verify the claim, and no court record was provided.
On distribution, the post’s views equal about 4.6% of the 93,386,567 monthly app users Similarweb estimated for Grok in October, by our arithmetic; views count impressions, not unique people, so this is a comparison of scale only. Similarweb also ranked the Grok website No. 149 among the world’s most-visited sites in October, down six places from September, as we reported in Claude Climbs 6 Places to No. 25 as Perplexity Drops 26.
What Is Not Established
Similarweb’s figures are third-party estimates, not numbers reported by xAI. xAI has not published its own October app figures in the material we read. The September figures here are derived from Similarweb’s percentage changes and may differ slightly from Similarweb’s own September numbers because of rounding.
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Similarweb estimates Grok’s app reached 93.4 million monthly users and 12.7 million downloads in October 2026, both up a little over 3% from September, and about 42% above its March user estimate, by our arithmetic.
A note on sourcing. App figures are Similarweb estimates from its posts on X of 9 November 2026 and 14 April 2026; they are not figures reported by xAI. September values and growth comparisons are our arithmetic from Similarweb’s stated numbers and percentage changes.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
