Meta's Muse Overtakes ChatGPT, Stock Surges 11%

Meta's new Muse personal AI agent overtook ChatGPT as the leading free app on Apple's U.S. iOS App Store, accumulating 2.5 million downloads within its first 13 days, a surge that helped drive Meta's stock up 11.43% on September 21, its steepest single-day gain since April 2025, adding roughly $190 billion to the company's market value in a single session, according to CNBC's reporting on the launch.

Meta launched Muse on September 8 as a standalone personal AI agent, accessible via iOS and Android apps, the web, or WhatsApp, built on the company's newer Muse Spark model. The app lets people offload digital tasks including booking appointments, filling out electronic forms, sending emails, booking travel, and even monitoring home security camera feeds to AI-powered assistants, according to an earlier CNBC report on the launch.

Bernstein analyst Stacy Rasgon offered a genuinely useful framing for why this download surge matters beyond a single company's app store ranking. "I think up to this point most of the agentic use cases have not really been for normal people," Rasgon told CNBC in a "Squawk on the Street" interview. "Now you've got Meta's Muse and other agents out there that are starting to maybe get more potential for more broad-based adoption." Meta's built-in distribution advantage helped fuel that pace directly, with nearly 4 billion users across Facebook, Instagram, WhatsApp, and Threads giving the company reach no single competitor can match.

Meta was specific about how it's addressing the obvious security concerns around a general-purpose AI agent with access to a user's accounts and payment details. Wang, identified in CNBC's reporting as leading the project after Meta's $14 billion investment in his startup Scale AI, said the app runs within "its own isolated environment" inside Meta's computing infrastructure, and "never sees your actual passwords or payment details and asks before doing anything sensitive." Wang described the underlying design philosophy directly: "Behind the scenes, Muse might be doing very advanced coding workflows, or building sophisticated integrations, or doing quite a lot of heavy lifting while keeping that very sort of simple for the user."

Not every major platform welcomed Muse's arrival. Amazon has blocked Muse from accessing its shopping site, saying it wasn't given advance notice that the agent would interact with its platform, and citing privacy and security concerns, according to Slashdot's reporting on the dispute. An Amazon spokesperson framed the company's position directly: "We think it's fairly straightforward that third-party applications that offer to make purchases on behalf of customers from other businesses should operate openly and respect service provider decisions about whether or not to participate." Amazon separately claimed Muse appears to capture and store customer credentials and scrape account data, and said Monday night it is in direct conversation with Meta about the issue, though it declined to comment on whether it would consider legal action.

That standoff connects directly to Amazon's documented, ongoing pattern of resisting outside AI agents on its platform, having previously sued Perplexity over its Comet browser and moved to block shopping agents from Google and OpenAI, a legal fight that saw Amazon win a preliminary injunction against Perplexity in March, only to lose it in August when the Ninth Circuit ruled the user, not the AI company, was the one legally accessing Amazon's systems. Shopify took the opposite approach entirely: CEO Tobias Lütke announced the e-commerce platform is partnering with Muse to allow agentic checkout directly within its online stores.

Muse's rapid rise is worth understanding for any business evaluating how quickly consumer AI agents could reshape e-commerce and digital service interactions, since a single agent hitting 2.5 million downloads in under two weeks, backed by nearly 4 billion existing users across Meta's platforms, represents a genuinely different distribution scale than any prior consumer AI agent launch.

For businesses in e-commerce specifically, the sharply divergent responses from Amazon and Shopify, one blocking the agent entirely over security concerns, the other actively partnering to enable agentic checkout, illustrate a genuine, unresolved strategic choice every online retailer will likely need to make as AI agents increasingly act on behalf of consumers.

How many downloads has Meta's Muse AI agent gotten?
Muse accumulated 2.5 million downloads within its first 13 days after launching September 8, 2026, overtaking OpenAI's ChatGPT as the top free app on Apple's U.S. iOS App Store.

Why did Amazon block Meta's Muse from its shopping platform?
Amazon said it wasn't given advance notice that Muse would interact with its site, citing privacy and security concerns, and claimed the agent appears to capture and store customer credentials and scrape account data.

How much does Meta's Muse cost to use?
Muse is available in a free tier, alongside paid subscription plans of $20 or $100 per month depending on usage.

Meta's Muse personal AI agent overtook ChatGPT as the top free app on Apple's U.S. iOS App Store, accumulating 2.5 million downloads within 13 days of its September 8 launch, driving Meta's stock up 11.43% in a single session and adding roughly $190 billion to the company's market value. Meta says the agent, which can book travel, send emails, and make purchases on a user's behalf, runs in an isolated computing environment and never directly accesses passwords or payment details. Amazon blocked Muse from its shopping platform entirely over privacy and security concerns, continuing its documented pattern of resisting outside AI agents, while Shopify took the opposite approach, actively partnering with Meta to enable agentic checkout across its online stores.