Price
Muse starts at $0, with a usage limit Meta hasn't published. Power is $20/mo and Max $100/mo.
Gemini Spark has no plan of its own. It comes with Google AI Pro ($19.99/mo) or Google AI Ultra ($99.99/mo, or $199.99/mo for the 20x tier). Google launched it as a beta for Ultra subscribers in the US before opening it to Pro.
Dots come with ChatGPT Pro ($100, $200 or $500 a month) or Business Premium. All three Pro tiers are open to new subscribers; only Pro $500 includes Astra Ultrafast.
Bottom line: Muse to start free; Gemini Spark for the cheapest paid plan; Dots if you already pay for ChatGPT Pro.
What each can do
Meta says Muse browses the web, fills in forms, sends email, books travel, makes purchases and negotiates for you.
Gemini Spark runs multi-step tasks across Google's apps in the background. Google has added outside apps too: Canva, Dropbox, Instacart, OpenTable and Zillow Rentals, plus custom MCP connections. It can also run tasks on your Mac (beta, Ultra only).
A dot has its own cloud computer and browser, works through connected apps (OpenAI says 4,000+ through plugins), runs scheduled tasks and does background research.
Bottom line: Spark is the one to pick if your life runs on Google, Muse for errands, and Dots for work across many apps.
Where you use it
- Muse: iOS, Android and the web.
- Gemini Spark: the Gemini app on the web and mobile; macOS beta for Ultra.
- Dots: set up on ChatGPT's web or desktop app; chat from the mobile app, Slack or Teams.
Safety and privacy
Muse works in a dedicated cloud machine where a "Sentinel" agent must approve anything that reaches the internet; a Confidential VM with a key you hold is announced, not live.
Gemini Spark is designed to ask first before spending money or sending email, and its app connections are off by default.
Dots get automatic review of account-affecting actions and Custom Rules. On personal plans you choose whether dot conversations and work improve OpenAI's models.