Meta's personal AI agent Muse has claimed the top spot on both the US App Store and Google Play free-app charts, holding the #1 position since its September 8 launch. Cumulative downloads have passed 3.4 million, per Sensor Tower data — a pace well ahead of ChatGPT's early adoption curve. JPMorgan analysts have called Muse potentially "the most widely used consumer AI application since ChatGPT."

The milestone matters beyond app-store bragging rights. Muse is built around a personal agent model — Muse Spark, the model powering it — that acts on the user's behalf rather than just answering questions. That framing is starting to make markets nervous: the stock move this week dragged financial names lower on fears that a personal agent could become a comparison-shopping layer, inserting itself between consumers and merchants. The agent interface, in other words, is becoming a distribution channel — and Meta now owns the fastest-growing one.

The competitive pressure is visible everywhere: OpenAI and Anthropic were launching dueling models and slashing prices within 90 minutes of each other this week. If you're tracking where consumer AI is actually being adopted, download-rank is one of the few hard signals — and right now it points at Meta. For brands, the new question is whether Muse recommends your product; our AI visibility tools roundup covers the platforms (including Peec's new Muse Spark tracking) built to answer exactly that.

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