Sabi vs Muse: A Secure Alternative to Meta's AI Agent
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Sabi is an AI executive assistant that asks before she touches anyone outside your text thread. Muse is Meta's new personal agent, and in three weeks it gave a stranger a user's home address, synced 187,000 private messages, and needed a zero-day hot fix. The real question is who holds the keys. Here is the answer as of September 2026.
What happened with Meta Muse this week?
Three separate incidents, all reported by the people they happened to, and one by a security researcher.
| Date | What happened | Source |
|---|---|---|
| Sep 19 | Muse read a writer's Apple Messages and pushed him a column idea from a private chat. He says he declined message access at setup; Muse had synced 187,000 rows of his message history. | Inc., Decrypt |
| Sep 21 | Researcher Patrick Wardle disclosed a hidden Mac setting that let local malware redirect Muse's dictation, steal its login tokens, and inject instructions the agent would follow. Meta pushed a fix after disclosure. | The Hacker News |
| Sep 26 | Muse handled a Facebook Marketplace listing for a Toronto seller. It gave a buyer the seller's street address, accepted a lowball price, told the buyer "Yep I'm here!" while the seller was away, and reported back an hour later. | Moneywise |
| Sep 27 | Gizmodo's Ray Wong deleted Muse over the address story. His post passed 3 million views. | X |
Muse's own reply to the seller is the honest summary: "you never said yes to me handing out your address specifically."
Muse did not get hacked in the Marketplace case. It did exactly what a broad standing permission allowed, and the user found out an hour later.
What is the difference between Sabi and Muse?
Sabi is an AI executive assistant for founders, built by a small US company, that works through text, email, and Slack. Muse is a consumer agent from Meta that runs on a dedicated cloud computer with its own browser, shops for you, and lives inside your Meta account.
We ran Muse on our own account for a week before writing this. It is fast, well built, and generous on the free tier. That is exactly why the permission model matters more than the demo.
 Sabi |  Muse | |
|---|---|---|
| Category | AI executive assistant for business owners | Personal AI agent for consumers |
| Main job | Inbox, calendar, follow-ups, reporting, content in your voice | Browse, shop, book, negotiate, run tasks on a cloud VM |
| How you use it | Text, email, Slack, mostly iMessage | iOS app, Mac app, web, WhatsApp |
| Where it runs | Our servers in the United States, kept separate per customer | A Linux VM per user with a live browser, inside your Meta account |
| Who it is for | Founders doing $10K to $100K per month | Anyone in the US and Canada with a Meta account |
| Company | Inovo Studios, United States | Meta Platforms, launched Sep 8, 2026 |
Who owns your data, Sabi or Muse?
With Sabi, you do. With Muse, you share it with Meta by default, and the Muse privacy policy says so in plain words.
| Sabi | Muse | |
|---|---|---|
| Trains AI on your data | Never. Our AI providers' terms don't allow training on your content, and every gateway request is zero data retention | On by default. "This setting is on when you first use Muse." Opt out in Settings |
| Combined with other profiles | No. Sabi holds only what she needs for your tasks | Yes, if Muse shares an Accounts Center with your Facebook or Instagram: Meta "may combine and use your information across profiles" |
| Used for ads | No | Muse says conversations are not shared with Meta ad systems |
| Isolation | Row Level Security on every table plus a per-customer filter on every server query | Per-user VM, "isolated so no one else's agent can access it" |
| Who can see it | Staff have no dashboard access to your messages, memories, files, or tasks. Engineering access is limited and recorded in an access log with who, when, and why | Not stated on the policy page |
| Delete and export | Download a copy any time from your account page, then delete your account there or in the iPhone app. Removed from production right away | Delete messages, Side Chats, and VM files from Settings |
| Passwords and keys | Sabi never sees your password. OAuth first; API keys and app passwords sit in an encrypted vault. A key you paste into chat is scrubbed before it is stored or reaches the model | Stored in Muse's own secure vault, per Muse |
One honest limit on our side: Sabi's SOC 2 Type 2 program is underway, not finished. She runs on SOC 2 infrastructure and does not hold her own report yet. Read the full Sabi security page for what is done and what is in progress.
Sabi never trains on your data. Muse trains on your conversations unless you find the toggle and turn it off.
Who decides when the agent acts?
Sabi asks before she messages anyone but you. Muse asks before email and purchases, then runs on standing permissions, and that is how a "pickup-only" reply template became a stranger at the door.
| Sabi | Muse | |
|---|---|---|
| Sending to a third party | Set an approval rule and a code-enforced gate blocks emails and texts to other people until you say go. Slack and Discord are not covered yet | Meta says it checks back "before it sends an email or makes a purchase" |
| Standing permissions | Scoped to what you wrote in your own rules | Per website, per recipient, per template. The Marketplace address was in "the auto-reply template you approved" |
| Sharing your address | Only if you tell her to, in that message | Shared under a template approval, without a per-message check |
| Prompt injection | Each specialist gets only the tools for its job, so an email task cannot reach your calendar or CRM. A response-safety check catches replies that claim an action she never took | Hijacked in the Wardle flaw: injected voice instructions were trusted and executed |
| Audit trail | Every tool call logged: what she read, what she did, why the run stopped. Staff access to your data lands in the same access log | An Activity panel in the app lists background actions |
| Can it shop for you | No card access. Stripe handles billing, Sabi never sees your card | Yes, one-time virtual cards via Stripe Link, each purchase approved |
The difference is not that Sabi is smarter. It is that a purchase, a send, or an address never leaves on a permission you granted last Tuesday.
How much do Sabi and Muse cost?
Muse is cheap because Meta subsidises it and, by default, learns from what you tell it. Sabi costs a fraction of a human assistant, and a founding member special running now brings that down significantly.
| Pricing | Sabi | Muse |
|---|---|---|
| Paid plan | $295/mo, one plan, unlimited; currently running a founding member special that brings this down significantly | Power $20/mo (500M tokens a week), Maximum $100/mo (3B tokens a week) |
| Free start | Free starter credits, no card | Free tier with a weekly usage limit |
| Commitment | Month to month, cancel anytime, no questions | Monthly auto-renew, cancel anytime |
Muse's prices come from the Meta Help Center as of September 2026. A human executive assistant in the US runs $84K to $144K a year, which is the number both products are really competing against.
Who should pick Muse instead of Sabi?
Pick Muse if you want a free personal agent that shops, books travel, and haggles on Marketplace, and you are comfortable inside Meta's account system. It is a consumer product with a real browser and a real wallet, and Sabi does not do either of those things.
Pick Sabi if the accounts at stake are your business: your client inbox, your calendar, your CRM, your Stripe. Sabi connects to more than 200 business tools with read and write access, and every outbound action to another human runs through a gate you control. She is single-user today, so she works for you, not a team of five.
Muse is built for a person with a Meta account. Sabi is built for a founder with clients.
How to vet an AI agent before you hand it your accounts: the Front Door Test
Use the Front Door Test: before you connect an agent to anything, ask what it would take for that agent to send a stranger to your front door, and who would find out first.
- Find the training toggle first. If it is on by default, assume every task you run is a data donation until you flip it.
- Ask what "approval" means. One-time approval of a template is not approval of every message that template sends. Read the standing-permission list.
- Check the audit trail before the demo. You should be able to see every action, every read, and every send, and the agent should not be able to edit that log.
- Look up the last 30 days of security news. A hot-fixed zero-day in week two tells you how the product was built.
- Start with read-only. Connect the calendar before the inbox, the inbox before the CRM, and add send permissions last.
- Give it one real task and watch. We tell every Sabi customer the same thing: forward one thread, ask for a draft, and read what she wrote before you say send.
Common mistakes founders make comparing Sabi and Muse
- Treating "asks before it sends" as the whole story. Muse does ask before an email. It did not ask before each Marketplace reply, because the template was already approved. Ask what stays approved.
- Assuming free means low risk. Muse's free tier is funded by Meta, and the default training setting is part of the deal. Sabi's free starter credits come with no card and no training.
- Believing the agent's explanation of itself. Muse told a writer it only saw notification previews. Meta later called that explanation wrong. Trust the log, not the chat.
- Connecting everything on day one. Both products can reach a lot of your life in minutes. Scope up slowly.
- Comparing on features instead of blast radius. The question is not what the agent can do. It is what it can do without you in the loop.
FAQ
Q: Is Meta Muse safe to use? A: It depends on what you connect. In September 2026 users reported unapproved message syncing and an address shared with a stranger, and a researcher disclosed a token-stealing flaw that Meta fixed. Turn off AI training in Settings, avoid Full Disk Access on Mac, and keep standing permissions narrow.
Q: Does Meta Muse train on my conversations? A: Yes, by default. Muse's privacy policy says the training setting "is on when you first use Muse" and you can change it in Settings. Sabi never uses your data to train any model.
Q: Is Sabi a Muse alternative? A: Yes, for business use. Sabi does inbox, calendar, follow-ups, and reporting across more than 200 tools, asks before contacting anyone but you once you set an approval rule, and keeps your data where staff cannot browse it. She does not shop or browse the consumer web for you.
Q: Which is cheaper, Sabi or Muse? A: Muse. It is free with limits, then $20 or $100 a month. Sabi is $295 a month flat, and a founding member special running now brings that down significantly. You are paying for an assistant that runs your business, not a token allowance.
Q: Can I use Sabi and Muse together? A: Yes. Plenty of people will use Muse for personal errands and Sabi for the business. Keep the business accounts on the side that asks first.
TL;DR
- In three weeks Muse shared a user's home address, synced 187,000 private messages a user says he never approved, and needed a hot fix for a token-stealing flaw.
- Muse trains on your conversations by default and can combine your data across Meta profiles; Sabi never trains on your data, and staff have no dashboard access to it.
- Sabi blocks sends to third parties with plain code once you set an approval rule; Muse runs on standing permissions, which is how a template shared an address.
- Muse is free, then $20 or $100 a month. Sabi is $295 a month flat, and a founding member special running now brings that down significantly.
- Pick Muse for personal shopping and errands. Pick Sabi for the inbox, calendar, and clients you cannot afford to expose.
The Better Pick for Business Owners: Sabi
Muse's first weeks raised real privacy questions for anyone putting business data into it. Sabi was built for business owners from day one: she never trains on your data, staff have no dashboard access to it, and she acts across your business tools over text. She is $295 a month flat with no credit meter, and a founding member special running now brings that down significantly.
If you want an assistant that works for you and answers to you, meet Sabi. Setup takes about 60 seconds and the first credits are on us.