Comscore said that in the past three months, mobile reach for AI tools, including both mobile web and native app usage, grew 5.3% to 73.4 million users, while PC usage fell 11.1%.

From November 2024 to June 2025, mobile adoption of AI assistants grew 82%, with Microsoft Copilot (up 175%), Google Gemini ( 68%) and OpenAI ChatGPT ( 17.9%) the three fastest growing brands on mobile between March and June 2025.

The findings are from Comscore’s AI usage tracker, which was introduced in May and measures visitation for 117 AI tools across nine categories on PC and mobile.

Comscore’s audience deduplication and cross-visitation data showed that more than 85% of top AI assistant users stuck to one platform, with OpenAI mobile users deemed the most loyal compared with Google and Microsoft users, who showed higher platform exploration.

Smriti Sharma, senior vice-president custom IQ at Comscore, said: “The evolution of how consumers use AI tools on mobile isn’t just about convenience, it’s about behaviour.

“Leading brands are positioning AI assistants as personal, always-available companions, and users are responding. From voice commands to image inputs, users are gravitating toward AI tools that feel native to mobile environments.”