Your subscription.
No model lock-in.
Your open source
AI coworker.
Talk to OpenTag in 
Slack and 
Lark with no AI provider lock-in.
# dev-team
@OpenTag can you check
the latest PR?
I’ll review the changes and
report back here.
Fetching PR details…
Fetching PR details
Analyzing code changes
Running tests
Summarizing results
acme / web-appPublic#127
Refactor authentication and add tests
src/auth/session.ts
42
- return null43
+ return await getSession()Used by teams at
OpenAI
Google
OpenAIGoogle1/3Connect your workspace
Connect to your messaging app.
Lark
Slack
2/3Choose your agent
Runs on the plan you already pay for.
Claude Code
Codex
Pi
3/3You’re set up.
Invite it to a channel.Invite it to # product-eng
Your way of working
Your AI coworker.
From Slack talk to AI agents that run on your own machine and use your model provider of choice.
Your machine.
Run agents locally.
Your coworker.
Customise agent profiles.
Bring your agent
Works with the agents you use.
Power OpenTag with your agent subscription plan.
Claude Code
Codex
Pi
CursorComing soon
KimiComing soon
OpenCodeComing soon
Z.aiComing soon
DeepSeekComing soonConnected work
Connect your stack.
OpenTag agents connect to over 1000 of the most popular services.
Try OpenTag for freeIntegrations
GitHub
Shared knowledge
Memory that’s yours.
Share team memory across your AI agents with Context Tree, a portable, file-based, git-backed memory layer, hosted in your GitHub organization.
File-basedReadable, portable, future-proof.
Git-backedVersioned and collaborative.
In your GitHub organizationPrivate and under your control.
context-tree
agents
artist/
analyst/
developer/
memory
goals.md
decisions.md
patterns.md
README.md
goals.md
# Team goals
– Build useful AI coworkersCompare approaches
The most configurable AI coworker.
Scroll the table to compare all products →
| Capability | OpenTag | Claude Tag | Viktor |
|---|---|---|---|
| Open source | Apache 2.0 | ||
| Team mode | Invite your agent to team channels | ||
| Agents | Any agent | —Anthropic only | —Proprietary agent |
| Bring your own subscription | Any API key, Claude & Codex subscriptions | —DMs only | —— |
| Local first | Mac, Linux | ||
| Self-host | Docker | ||
| Pricing | Free | —Usage based | —Credit based |
From the people using it
Loved by builders.
“It finally feels like a build tool that works the way I want.”
JoshPlatform Engineer, Adobe“Running six agents in parallel and reviewing every diff in one place. This is the workflow I wanted.”
BrandonSoftware Engineer, Reddit“As a designer, the UI is the first thing I judge. This one actually holds up.”
Angela FUI/UX Designer, Figma“It's like adding five engineers to a two-person startup, overnight.”
Bruce ZSerial Entrepreneur“Agents triage my repo's issues and open PRs while I sleep. For a solo maintainer, that's huge.”
Sam HOpen-Source Maintainer“Beautiful UI, and it handles all the git worktree stuff for you.”
SammySoftware Engineer, Meta
The basics
FAQs
What is OpenTag?
OpenTag is an open source AI coworker that lives in Slack and Lark. You mention it in a thread with a task, it runs a coding agent on your own computer, and it replies in the same thread.
How does OpenTag work?
You mention OpenTag in a thread, and the OpenTag app hands the request to your computer, where a small background program runs your coding agent with your own subscription or API key. The work happens on your computer and the reply is sent back to the thread.
What do I need to use OpenTag?
A Mac or Linux computer with Claude, Codex or Pi installed, and Slack or Lark workspace where you can chat to OpenTag. More agents are on the way.
Can I use my existing AI subscriptions with OpenTag?
Yes, OpenTag works with your Claude or Codex plan, or with an API key. Subscription plans should be used in accordance with each provider's terms of use. For shared workspaces we recommend using an API key.
Which messaging apps does OpenTag support?
Slack and Lark. Teams and Discord support is on the roadmap.
How much does OpenTag cost?
OpenTag is free to use. You pay for your own AI use with your existing provider subscription.
What about data and privacy?
By default, OpenTag's servers don't store your conversations, code, or memory. The agent runs on your computer and talks to your model provider directly, and connectors like GitHub or Notion use your own credentials with the smallest scope that does the job. Team memory lives in a Context Tree, which is markdown in a git repository you host yourself.
Can my whole team use OpenTag?
Yes, one agent serves a channel and anyone in it can mention it. Agents can also hand work to each other and check on each other's progress. For shared workspaces we recommend using an API key.
Ready to work together?
Just tag it.
The future of work is humans and agents building side by side.
