No. Msty Studio is a commercial product from CloudStack, LLC, sold as Aurum licenses on top of a free tier. Its GitHub organization publishes documentation, translations and prompts, not the app's source. Grux OS is MIT licensed, with its whole source tree on GitHub.

Can Grux OS use the same local models as Msty?

Yes, through Ollama, which both support, so a model you pulled with Ollama works in both. Grux also treats an OpenAI compatible server on your Mac as a local model.

Is there a free Msty alternative for Mac?

Grux OS is $0 with no paid tier and no account, and it runs on a local model through Ollama with no key. It is an agent rather than a chat workspace, so check it does the job you use Msty for before you switch.

Is there an open source alternative to Msty on a Mac?

Yes: Grux OS is an open source (MIT) Mac app that runs on a local Ollama model or your own key, but it is an agent that acts on your Mac rather than a chat workspace like Msty. Msty Studio, a commercial app from CloudStack, LLC, chats with local models through Ollama, llama.cpp or MLX and with online providers, and adds Knowledge Stacks for your documents, MCP tools, an agent mode and persona chats. It has a free tier; Aurum costs $149 per user a year or $349 for life, and team plans add SSO and audit logs. Grux OS has no account and no paid tier. From one Command Panel it acts on the mail, calendar, files and meetings already on your Mac, with a shell whose every command can be undone, and you can change Grux itself through your own coding agent. Pick Msty to chat across many models over your documents. Pick Grux for an agent that does the work.

Grux OS 3.0.0 · last checked 2026-09-30 · generated from the shipping release

Side by side

	Grux OS	Msty Studio
What it is	An agent that acts on your Mac	A private AI workspace for chat, documents and agents
Source	Open source, MIT	Commercial, from CloudStack, LLC
Price	$0, no paid tier	Free tier; Aurum $149 per user a year, or $349 for life
Models	Ollama by default, a local OpenAI compatible server, or your own key	Ollama, llama.cpp and MLX locally, plus online providers
Your documents	Reads the files, mail and notes already on your Mac	Knowledge Stacks: retrieval over documents you add
Tools	116 built in tools, and an MCP bridge for other agents	MCP tools in its Toolbox, limited on the free tier
Where it runs	macOS 14 or later, Apple silicon	Studio Desktop, and Studio Web on the Aurum plan
Teams	One person, one Mac	Team plans with SSO, user management and an audit log

Msty's details are from its pricing page and Studio documentation, read on 3 October 2026.

Where Msty is the better choice

Chatting with many models side by side, local and online, in one workspace.
Retrieval over a library of your own documents, with Knowledge Stacks.
Teams that need SSO, user management and an audit log.
Working in a browser, with Studio Web on the Aurum plan.

Where Grux OS fits better

You want the model to act: triage mail, read your calendar, and run shell commands you can undo.
You want no account and nothing to buy.
You want to read and change the source: tell Grux what to change and it writes a work order for your own coding agent.

Where to check this

Claim	Source
Grux OS has no account and no server, and nothing is proxied	README, Privacy posture
Grux runs on an Anthropic API key, or Ollama running locally	README, Requirements
Grux works on your real Mailbox, Calendar, Contacts, Notes and Documents	README, What it actually does
Msty's free tier, Aurum at $149 a year, Aurum Lifetime at $349	Msty pricing
Msty Studio stores data locally on your device	Msty Studio docs

Questions

Is Msty open source?: No. Msty Studio is a commercial product from CloudStack, LLC, sold as Aurum licenses on top of a free tier. Its GitHub organization publishes documentation, translations and prompts, not the app's source. Grux OS is MIT licensed, with its whole source tree on GitHub.
Can Grux OS use the same local models as Msty?: Yes, through Ollama, which both support, so a model you pulled with Ollama works in both. Grux also treats an OpenAI compatible server on your Mac as a local model.
Is there a free Msty alternative for Mac?: Grux OS is $0 with no paid tier and no account, and it runs on a local model through Ollama with no key. It is an agent rather than a chat workspace, so check it does the job you use Msty for before you switch.

Download Grux 3.0.0 Read the source

Free, MIT licensed. macOS 14 or later, Apple silicon. 23.7 MB, signed and notarized by Apple. No account, no server, no subscription.