Price
The plans line up almost exactly. Both are free with a usage cap, and both charge $20 a month and $100 a month for more.
Meta publishes what each Muse plan buys: Power ($20/mo) gives 500M Muse tokens a week and Max ($100/mo) gives 3B. The free limit isn't published, and Meta says Muse subscriptions are still in limited testing.
Hark describes its plans relative to the free tier: Hark Pro² ($20/mo) gives 2× the usage and Hark Pro³ ($100/mo) gives 10×. Every feature is in every plan, including the free one. The free cap itself isn't published. Optional auto top-up buys more usage when you run low, up to a ceiling you set.
Bottom line: same prices. Muse tells you more precisely what you're paying for.
What each can do
Both work through a single ongoing chat, remember what you tell them and do web tasks on a cloud computer of their own.
Hark's computer is called Handoff; Hark says it can run up to six browsers at once. Around the chat, Hark adds Action Buttons (suggested tasks you approve with one tap, such as paying a bill), Panels (small apps it builds on your Home screen, for example from Strava or Venmo data), Projects for long-running topics and Specialties for workflows it repeats. It connects directly to Google Workspace and Microsoft 365.
Muse runs in a Muse Secure VM. Meta pitches it at errands and bigger goals: booking travel, filling in forms, negotiating, and a Goals tab where it tracks your progress and checks in. At checkout it uses Link by Stripe, which generates a one-time card and adds Link's purchase protections.
Bottom line: Hark builds more of its own interface around the chat; Muse leans on goals and protected checkout.
Where you use it
Both run on iOS, Android and the web.
Muse also works in WhatsApp, and its Mac app can, with macOS permissions you grant, find and organize your files and read apps such as iMessage, Notes, Reminders and Calendar. Before an important action, such as sending an email or making a purchase, it asks you to confirm. AI glasses support is "coming soon."
Hark lists only iOS, Android and the web. It says it will release its first hardware in 2027.
Safety and privacy
Approvals. Muse checks with you before sensitive actions like sending an email or making a purchase, and keeps an audit trail of what it did. A separate Sentinel agent on the same VM must approve anything that reaches the internet. Hark asks before it spends money or sends a message on your behalf, unless you've given it standing permission for that kind of task, and you can watch its browser and cancel.
Training. This is the clearest difference. Hark's privacy policy says your data is not used to train AI models, and no opt-out is needed. Muse's Help improve our AI models setting is on by default; turn it off under Settings → Data controls, and the change also covers your past interactions. Meta says Muse doesn't share your conversations or VM data with its ad systems. For more on Muse, see is Meta Muse safe.
Deleting data. Ask either one to forget something. Reset Muse in Data controls permanently deletes everything, and you can download your Muse data first. Hark's account deletion is under Settings → Profile.
Meta has announced a Muse Confidential VM, encrypted with a key only you hold, for later in 2026. It isn't live yet.
Availability
Muse: rolling out in the US, with subscriptions not yet available in every location. Hark Pro: Hark says it is available to everyone, but it doesn't publish a country list. Hark requires you to be 18 to use it; Muse requires 18 to subscribe.