Public betaFree app · bring your own AI key

Meet your AI teammates.

Named helpers with their own character, model and memory. They plan, research, write and build with you — and ask before doing anything risky.

  • Plan my week around three runs
  • Compare these two job offers
  • Turn my notes into a blog post
  • Why does this script crash?
  • Draft a polite reply to my landlord
  • Make a reading list on sleep science
  • Prep me for Thursday’s interview
  • Split this project into small steps
Start free beta

Sign in with Google or a code we email you. No password. Phone, Watch or Echo Show? Get early access

Juno, Muster’s orange designer teammate, wearing a plum beret and a paint-splashed apron

See it work

Ask in plain words. Get something you can use.

Every teammate works in its own conversation, remembers what you told it, and stops to check with you before it acts.

SageGemini · your key

  1. I’ve got a dentist appointment Tuesday, a work deadline Thursday and my sister visiting Saturday. Plan my week so I still get three runs in.

  2. Here’s a week that fits all three:

    • Mon Deadline work 9–12 · run at 7 pm
    • Tue Deep work 9–12 · dentist 2:30 pm
    • Wed Final review of the draft · run at 7 pm
    • Thu Submit before noon · easy evening
    • Sat Short run before your sister arrives

    From memory: you prefer evening runs

  3. Sage wants to save week-plan.md to its workspace

  4. You allowed it once. Saved week-plan.md.

Sample conversation with fictional data. It is scripted, does not contact an AI provider and does not send anything.

How people use it

One team for the things on your mind.

Think it through

Research a decision, compare the options and get the trade-offs in plain words.

Get it written

Turn rough notes into an email, a post, a plan or a report you can edit.

Get it working

Debug a script, sketch a spreadsheet or break a project into steps you can take.

Your AI, your choice

Bring the AI you already have.

Each teammate runs on the model you pick, with your own provider key. No key yet? Google AI Studio gives you a free Gemini key, and OpenCode Zen includes free models.

  • OpenAI, Anthropic, Google Gemini, OpenCode Zen, OpenRouter and more
  • A different model for each teammate
  • Backups in a Muster folder in your own Google Drive
  • Gmail when you choose to connect it
Models and setup
Kit, Muster’s blue developer teammate, in a navy hoodie working on a laptop
  • AiOpenAI
  • AAnthropic
  • GGemini
  • ZOpenCode Zen
  • ROpenRouter
  • DGoogle Drive
  • MGmail

A teammate for every job

Different minds. Good company.

Give each teammate a role. They keep their own conversations, so the researcher never loses the thread while the designer gets on with the flyer.

  1. QuillResearcher

    “Is a heat pump worth it for a two-bedroom flat?”

    It depends on three things on your bill. I compared running costs for gas, a heat pump and a hybrid, and listed the questions to ask an installer.

  2. JunoDesigner

    “My bakery’s flyer feels cluttered.”

    Lead with one thing: Saturday sourdough. I moved prices to a small strip and gave the photo two-thirds of the page. Three versions to pick from.

  3. KitDeveloper

    “Why does my script crash on an empty CSV?”

    Line 14 reads the first row before checking there is one. Here’s a two-line guard and a test for the empty file.

  4. SageCoordinator

    “Turn this voice-note transcript into a to-do list.”

    Seven tasks, grouped into today, this week and someday. Two have no deadline yet. Want me to suggest one?

Fictional examples.

Always learning

Memory you can read and correct.

Each teammate keeps its own memory of what matters to you. Open it any time, see exactly what it knows and fix anything it got wrong. The next conversation picks up where you left off.

Build your AI team

A name. A character. A job to do.

Start with one teammate and add more as you need them. Choose who they are, how they talk, which model they use and what they look after.

Make your first teammate
Quill, Muster’s green researcher teammate, with round glasses, a field vest and a notebook

Quill

Researcher

Character
Curious, careful, shows its sources
Model
Your pick, with your own key
Memory
Its own, and you can read it
Actions
Asks you first when it matters
JunoKitSage

You stay in charge

Helpful, on your terms.

You approve risky actions

Before a teammate does something that matters, it shows you what and why. You choose.

Your key, your bill

Provider keys you save are stored encrypted and used for your requests. Usage is billed by your provider.

Backups in your Drive

Workspace backups go to a Muster folder in your own Google Drive, where you can see them.

No passwords

Sign in with Google or with a one-time code sent to your email.

Leave any time

Delete your account and its workspace from Settings whenever you like.

Approvals and privacy Privacy policy

Get started

Three steps to your first teammate.

  1. 1

    Sign in

    Use Google or a code we email you.

  2. 2

    Add your AI key

    Paste a key from your provider. Free options are linked during setup.

  3. 3

    Meet your teammate

    Give it a name and a first job. Pick up the conversation any time.

Start free

FAQ

Good to know.

What is Muster?

Muster is a workspace of AI teammates. Each teammate has its own name, character, model and memory, and you chat with them in your browser or the desktop app.

Is Muster free?

Yes, the app is free. Your AI provider usage and any connected-service costs are separate and billed by those providers.

Do I need an AI subscription or API key?

On the web you bring your own provider API key. Google AI Studio offers a free Gemini key and OpenCode Zen includes free models. The desktop app can also use other connection types; availability depends on the engine. See engines and models.

Is the conversation above a live AI run?

No. It is a scripted preview with fictional sample data. It does not contact an AI provider, connect an account, or send anything.

Can Muster act in my other tools?

With supported tools connected and the right permissions, teammates can help beyond the conversation. Available actions and approval behavior depend on the tool, engine, and setup. Review the approval guide before enabling actions.

Where can I use Muster?

In any modern browser, on a computer or a phone, and in the desktop app. The hosted web workspace and a local desktop workspace are distinct; signing in does not automatically merge them. The Windows and Linux builds are not code-signed yet. Phone and Watch companion apps are in beta. See current downloads, or explore the CLI setup.

Where is my data kept?

The Muster service stores your hosted workspace. Backups go to a Muster folder in your own Google Drive, and you can delete your account from Settings. The privacy policy has the details.

Coming to more places

Get early access on your devices.

The web beta is open to everyone today. Companion apps for your wrist, phone and kitchen counter are next. Tell us which ones you want and we’ll email you when your invite is ready.

Which devices do you use?

Your next idea has company.

Free during the public beta. Bring your own AI key.

Start free beta Get the desktop app