Key Takeaways
- Viktor is a full AI coworker available in both Slack and Microsoft Teams with 3,200+ integrations, a persistent cloud Linux sandbox per workspace, code execution, professional deliverable generation, and proactive automation that suggests recurring tasks based on observed patterns.
- Junior installs as an AI employee in Slack and Teams with a name your team chooses, a work email address, and 3,000+ tool integrations. It operates proactively without needing to be tagged and retains memory across every conversation and channel.
- Slack AI is included in the Business+ plan at $15 per user per month and provides AI-powered search, channel recaps, and thread summaries inside Slack. It does not connect to external tools and takes no actions outside Slack.
- Microsoft 365 Copilot costs $30 per user per month, works inside Word, Excel, PowerPoint, Outlook, and Teams chat, and is the strongest in-document AI assistant in the Microsoft ecosystem. It does not act autonomously across non-Microsoft tools.
- Dust starts at $29 per user per month and provides AI-powered question-and-answer over internal knowledge sources including Notion, Google Drive, Confluence, and Slack. Its focus is search and retrieval rather than task execution.
- Zapier connects Slack and Teams to 7,000+ apps through trigger-action workflows and added AI reasoning features in 2025, but remains strongest for deterministic, pre-configured flows rather than open-ended judgment tasks.
- Glean provides enterprise AI search across a company’s entire knowledge stack at approximately $50 or more per user per month and is best suited for large organizations (200+ employees) that need unified search, not a task-executing coworker.
Most AI chat tools stop at answering questions. AI coworker agents go further: they join your Slack workspace or Microsoft Teams org as a persistent teammate, connect to your actual business tools with read and write access, take actions without being manually triggered, and deliver finished outputs (reports, code, spreadsheets, campaigns) directly into channels. The category has grown significantly in 2025 and 2026, and the tools span a wide range of capability from native channel summarization to full autonomous work execution across dozens of third-party systems.
The meaningful distinction in 2026 is not between tools that use AI and tools that do not. It is between tools that work inside your communication platform without crossing into external systems, tools that bridge communication and knowledge retrieval, and tools that genuinely execute work across your full tool stack. Choosing the wrong category creates a mismatch between what you expect the agent to do and what it can actually accomplish.
This list covers the eight best AI coworker agents built for Slack and Microsoft Teams in 2026, organized by what each one actually does rather than what its marketing claims. Pricing, integration depth, platform support, and genuine capability boundaries are all covered for each tool.
1. Viktor: Best for Full AI Coworker Across Both Platforms
Viktor is a Slack-native and Microsoft Teams-native AI agent that operates as a full AI coworker with 3,200+ business tool integrations and real read-and-write access across the stack. Each Viktor workspace instance runs on its own persistent cloud Linux computer with shell access, file system, and execution environment. Viktor connects to Stripe, HubSpot, Meta Ads, Google Ads, Notion, Linear, GitHub, PostHog, and thousands of other tools in a single connected workspace. Conversations can span multiple systems in one message: pull revenue from Stripe, update a Notion doc, and post a formatted PDF summary into Slack as a single response to a single prompt.
Viktor produces professional deliverables: board-ready PDFs with charts, Excel financial models, PowerPoint decks, full-stack web applications with real-time databases, and Remotion-rendered video. Proactive automation is built in: Viktor observes patterns across channels and surfaces automation suggestions (for example, noticing you pull the same weekly report manually and offering to schedule it). Sensitive actions require an explicit approval button click in Slack before executing. Credentials are never exposed to the model; API keys and OAuth tokens are injected at execution time by the backend. Persistent memory is stored as structured markdown files that accumulate company context, tool preferences, and workflow templates over time.
Pros:
- 3,200+ integrations with real read-and-write access, the deepest integration coverage in this category
- Generates professional deliverables including PDFs, spreadsheets, slide decks, and full web applications
- Persistent memory that builds company-specific knowledge and workflow templates over time
- Proactive automation suggestions based on observed patterns in Slack channels
- Secure-by-design: credentials injected at backend execution time, sensitive actions require explicit approval
Cons:
- Best suited for teams of 10 to 50 people; the autonomous depth may be more than very small teams need
- Paid plans scale with usage, which can be harder to forecast for variable workloads
Pricing:
- Free tier: Available to start with no credit card required
- Paid plans: Scale with usage; contact Viktor for current plan details
Platform support: Slack and Microsoft Teams
Visit: Viktor
2. Junior: Best AI Employee for Cross-Tool Proactive Work
Junior installs as a Teams app or Slack app and operates as a named AI employee with its own user account, work email address, and 3,000+ tool integrations. When you install Junior, you give it a name, and it joins the channels you assign with the same presence as a human teammate. Junior is proactive: it does not wait to be tagged. It monitors channels, remembers prior work, and follows up on incomplete tasks. It works across Microsoft tools and non-Microsoft tools alike, which differentiates it from Microsoft Copilot for teams whose stack includes non-Microsoft software like HubSpot, Stripe, or Meta Ads alongside Teams.
Junior supports sales assistant workflows (outreach, CRM updates, lead follow-up), media buyer workflows (Google Ads and Meta Ads monitoring and reporting), weekly reporting, daily briefings, and general operations tasks. Persistent memory carries context across all channels and conversations. The free trial includes $100 in credit with no credit card required. Junior’s compare page positions it directly against Viktor, Claude Tag, Copilot, and Zapier, reflecting its positioning as a cross-category alternative to all of them.
Pros:
- Installs as a named AI employee with its own user account and work email, giving it genuine team presence
- Proactive by default: monitors channels and follows up without requiring an @mention
- Covers Microsoft and non-Microsoft tools equally, avoiding the Microsoft-only scope of Copilot
- Free trial with $100 credit and no credit card required lowers the barrier to evaluation
Cons:
- Less documentation on specific integration depth per tool compared to Viktor’s published integration catalog
- Code execution and web application generation capabilities are not as prominently documented as Viktor’s equivalent features
Pricing:
- Free trial: $100 in credit, no credit card required
- Paid plans: Listed at junior.so/pricing; contact for enterprise terms
Platform support: Slack and Microsoft Teams
Visit: Junior
3. Slack AI: Best for Native Slack Search and Summarization
Slack AI is Slack’s built-in AI feature set, not a third-party addition. It applies AI to Slack’s own data: message history, channels, threads, and files. Slack AI provides AI-powered search that answers questions from channel history in natural language, channel recaps that summarize what happened while you were away, thread summaries that compress long discussions into key points, daily digests of activity across selected channels, and reply suggestions in direct messages. For teams whose primary frustration is information overload inside Slack (too many channels, too many threads, too hard to find past decisions), Slack AI directly addresses that friction without requiring any external tool setup.
Slack AI does not connect to external tools. It cannot pull data from Stripe, create a Notion document, or manage a campaign. Its scope is entirely within Slack. This makes it complementary to external-tool coworker agents rather than a replacement for them. Basic AI features (conversation summaries, huddle notes) are included in the Pro plan at $7.25 per user per month. Advanced features (AI search answers, channel recaps, AI-generated digests) require Business+ at $15 per user per month. The $10 per user per month AI add-on was discontinued for new customers in July 2025.
Pros:
- Zero additional setup: already built into Slack, no new integration or authentication required
- AI search answers questions from Slack history with source citations
- Channel recaps and thread summaries reduce information overload for distributed teams
- Included in Business+ at $15 per user per month with no additional line-item cost
Cons:
- No external tool connections: cannot access Salesforce, Google Drive, Jira, or any system outside Slack
- Takes no actions: cannot create documents, send emails, update records, or execute any workflow step
- Memory is limited to Slack message history rather than structured, evolving company knowledge
Pricing:
- Pro: $7.25 per user per month (includes basic AI features)
- Business+: $15 per user per month (includes full Slack AI: search answers, recaps, digests)
Platform support: Slack only
Visit: Slack AI
4. Microsoft 365 Copilot: Best for In-Document AI Across Microsoft Apps
Microsoft 365 Copilot is Microsoft’s AI assistant integrated across the full Microsoft 365 application suite: Word, Excel, PowerPoint, Outlook, and Teams. In Teams specifically, Copilot summarizes meeting transcripts, recaps missed chat threads, suggests action items from conversations, and assists with message drafting. In Word, it drafts and revises documents. In Excel, it analyzes spreadsheets, generates formulas, and creates charts from natural language prompts. In PowerPoint, it builds presentations from prompts or existing documents. For organizations already inside the Microsoft 365 ecosystem, Copilot adds genuine AI capability to every application in the suite through a single license.
Copilot’s primary limitation as a coworker agent is its scope: it operates on Microsoft 365 content and does not autonomously take actions across non-Microsoft systems. It does not connect to HubSpot, Stripe, or Meta Ads. It does not proactively post to channels, run scheduled tasks, or build workflows across tool stacks. Teams whose work lives entirely in Microsoft 365 will find significant value in Copilot. Teams with hybrid stacks that include Salesforce, Google Workspace, Notion, or any non-Microsoft tool will hit Copilot’s scope limits quickly for external-tool tasks.
Pros:
- Deep integration across every Microsoft 365 application in a single license
- Meeting transcript summarization and action item extraction in Teams are among the best in class
- Excel analysis with natural language formula generation and charting is genuinely useful for non-technical users
- No additional authentication required for teams already on Microsoft 365
Cons:
- Scoped entirely to Microsoft 365 content: cannot access non-Microsoft tools or external data sources
- Not a proactive agent: requires a prompt or @mention in each interaction
- At $30 per user per month, among the more expensive options in this list
Pricing:
- Microsoft 365 Copilot: $30 per user per month (requires Microsoft 365 Business Standard or higher)
Platform support: Microsoft Teams (and full Microsoft 365 suite)
Visit: Microsoft 365 Copilot
5. Dust: Best for AI-Powered Internal Knowledge Retrieval
Dust builds AI assistants that answer questions from a team’s connected knowledge sources. It indexes Notion, Google Drive, Confluence, Slack, and other document repositories and provides natural-language question-and-answer over all indexed content simultaneously. Rather than searching across six different tools to find a policy document, an onboarding guide, or a past project decision, a team member can ask Dust in Slack and receive a sourced answer drawn from all connected sources at once. Dust also supports building custom AI assistants for different team functions: a sales assistant trained on deal history and competitive battlecards, an engineering assistant trained on technical documentation and pull request history.
Dust’s integration depth is in knowledge retrieval, not task execution. It does not take actions in business tools: it will not create a task in Linear, update a deal in Salesforce, or send an email to a lead. Its Slack integration surfaces answers in threads without requiring users to leave Slack, which reduces context-switching for knowledge lookup. Starting price is $29 per user per month.
Pros:
- Answers questions by searching across all connected knowledge sources simultaneously with source citations
- Custom assistants per team function allow specialized knowledge retrieval for sales, engineering, and support
- Slack integration surfaces answers without requiring users to leave their communication channel
- Strong on internal documentation retrieval for teams with large Notion, Confluence, or Google Drive footprints
Cons:
- Primarily a retrieval tool: does not execute actions in business systems
- Does not produce professional deliverables or run scheduled cross-tool workflows
- At $29 per user per month, more expensive than some tools with broader capability for task execution
Pricing:
- Pro: $29 per user per month
- Enterprise: Custom pricing for larger organizations
Platform support: Slack (Teams integration in development)
Visit: Dust
6. Zapier: Best for Rule-Based Automation Across Slack and Teams
Zapier connects Slack and Microsoft Teams to 7,000+ applications through trigger-action workflows called Zaps. A Zap watches for a specific event (a new message in a Slack channel, a new row in a Google Sheet, a new deal stage in HubSpot) and responds with one or more configured actions (create a Zendesk ticket, post a formatted Slack message, add a row to Airtable). Zapier introduced AI-powered features in 2025 and 2026 that allow more flexible trigger interpretation and AI-generated step content, but the core model remains deterministic: pre-configured flows execute exactly as defined when a trigger fires.
Zapier’s strength is reliability and breadth on predictable, repeatable workflows. Its limitation as a coworker agent is the absence of genuine reasoning. It cannot evaluate ambiguous situations, prioritize competing considerations, or handle novel requests outside its pre-defined Zap logic. For teams with clearly defined, repeatable processes that need to run automatically, Zapier is mature and well-proven. For teams that need an agent capable of judgment and improvisation across varying inputs: it is the wrong category of tool.
Pros:
- 7,000+ app connections, the largest integration breadth in this list
- Proven reliability for high-volume, deterministic trigger-action workflows
- Free tier available with 100 tasks per month for small workflow volumes
- Native Slack and Teams integrations with extensive trigger and action options in both platforms
Cons:
- Cannot handle requests that require reasoning, prioritization, or judgment between steps
- Workflows must be pre-configured: Zapier cannot improvise on novel tasks
- Higher task volumes on paid plans (Professional at $49 per month, Team at $69.95 per month) can become expensive
Pricing:
- Free: 100 tasks per month
- Starter: $19.99 per month
- Professional: $49 per month
- Team: $69.95 per month
Platform support: Slack and Microsoft Teams
Visit: Zapier
7. Glean: Best for Enterprise Knowledge Search Across All Company Tools
Glean is an enterprise AI search platform that indexes a company’s entire knowledge stack, including Google Workspace, Microsoft 365, Salesforce, Slack, Confluence, Jira, Zendesk, and dozens of other systems, and provides AI-powered unified search with results personalized by role and permissions. For large organizations where a customer success rep, an engineer, and a finance manager each need access to different relevant information from the same search query, Glean’s permission-aware personalization is a meaningful differentiator. The Slack and Teams integrations allow team members to search across all connected systems without leaving their communication platform.
Glean is primarily a read-and-retrieve tool with emerging agent features for knowledge-based actions. It does not execute cross-tool workflows, generate professional deliverables, or run proactive automations in the way that Viktor and Junior do. Pricing is not publicly listed; reports suggest approximately $50 or more per user per month with enterprise minimums, making it most appropriate for organizations of 200 or more people where the knowledge search problem justifies the per-seat cost.
Pros:
- Indexes the most comprehensive range of enterprise knowledge sources simultaneously with permission-aware results
- Personalized search results based on the user’s role, team, and access level
- Slack and Teams integrations allow cross-system knowledge search without leaving the communication channel
- Suitable for large organizations with complex, distributed knowledge across many systems
Cons:
- Primarily read-only: limited action-taking capability beyond knowledge retrieval
- Estimated $50+ per user per month pricing is above the range of most small and mid-market teams
- Enterprise minimums make it impractical for teams under 200 people
Pricing:
- Enterprise: Not publicly listed; approximately $50+ per user per month with enterprise minimums
Platform support: Slack and Microsoft Teams
Visit: Glean
8. Moveworks: Best for Enterprise IT and HR Service Automation
Moveworks is an enterprise AI agent purpose-built for IT and HR service desk automation. It resolves common employee requests (password resets, software provisioning, PTO approvals, hardware requests) automatically inside Slack or Microsoft Teams by connecting to identity management systems, ITSM ticketing platforms, and HRIS software. When an employee messages a Slack channel or Teams bot with an IT or HR request, Moveworks classifies the request, resolves it automatically if possible, or routes it to the correct human team with full context if human review is required. Reported resolution rates at enterprise customers are typically 40 to 60 percent of incoming requests handled without human intervention.
Moveworks is not a general-purpose coworker agent. Its scope is IT and HR service, and it does not handle marketing, sales, finance, or engineering tasks. Implementation requires a dedicated rollout with professional services support and typically 3 to 6 months before full deployment, which reflects its enterprise focus and the complexity of connecting to the breadth of systems it needs to touch. Pricing is not publicly listed; reported pricing is approximately $100 to $200 per employee per year under contract-based enterprise terms.
Pros:
- Purpose-built for IT and HR service automation with documented 40 to 60 percent auto-resolution rates at enterprise customers
- Deep integrations with major ITSM platforms (ServiceNow, Jira Service Management) and HRIS systems
- Available in both Slack and Microsoft Teams, meeting enterprise teams where they work
Cons:
- Scoped entirely to IT and HR: does not handle any business operations outside service desk workflows
- Enterprise-only with 3 to 6 month implementation timelines; not accessible for small or mid-market teams
- Contract-based pricing without public rates makes evaluation harder without a full sales process
Pricing:
- Enterprise: Not publicly listed; approximately $100 to $200 per employee per year
Platform support: Slack and Microsoft Teams
Visit: Moveworks
How We Evaluated These Tools
We evaluated each tool against four criteria: platform coverage (Slack, Teams, or both), integration depth and access type (read-only versus read-and-write), task execution capability (retrieval only versus cross-tool action-taking), and pricing accessibility for small to enterprise teams. We prioritized tools with verifiable pricing and documented integration catalogs over tools that claim broad capability without specifics. We excluded tools that require a separate web interface rather than operating natively inside Slack or Teams channels, since the core value proposition of a coworker agent is operating where the team already communicates.
Which Tool Should You Choose?
The decision framework is simpler than the market noise suggests. If you need a full AI coworker that takes real actions across marketing, operations, finance, and engineering tools in both Slack and Teams, Viktor and Junior are the two meaningful options in 2026. Viktor has the larger published integration catalog (3,200+ versus 3,000+), more documented professional deliverable capabilities, and a proactive automation observation system. Junior has a lower evaluation barrier with a $100 free trial credit and stronger documentation of its AI employee presence features, including the named user account and work email. Testing both on the same workflow over a week or two is practical given both offer free access.
If your primary need is better Slack search and channel management rather than cross-tool execution, Slack AI is already included in your Business+ plan and has no setup friction. If your team is Microsoft-first and needs AI across Word, Excel, PowerPoint, Outlook, and Teams meetings, Microsoft 365 Copilot at $30 per user per month is the right investment within that scope. If you have a large internal knowledge base across Notion, Confluence, and Google Drive and teams struggle to find information, Dust at $29 per user per month solves that retrieval problem cleanly. If you have repeatable, rule-based workflows that need to run automatically between Slack and other systems without requiring any reasoning, Zapier handles that reliably at a lower cost than any of the coworker agents. If you are an enterprise with 200+ employees and a fragmented knowledge ecosystem, Glean’s unified search and Moveworks’ IT/HR automation each solve specific enterprise-scale problems that smaller tools are not designed for.
Frequently Asked Questions
What is an AI coworker agent for Slack or Teams?
An AI coworker agent is an AI system that installs into Slack or Microsoft Teams as a persistent participant in channels rather than as a temporary tool invoked from a sidebar. It connects to business tools with real action-taking access (not just read-only retrieval), operates proactively without requiring a manual @mention for every task, and maintains memory of prior work, team context, and preferences over time. This distinguishes AI coworker agents from in-document assistants (like Microsoft Copilot inside Word) and from channel search tools (like Slack AI), both of which are reactive and scoped to their respective platforms.
What is the difference between Viktor and Junior?
Viktor and Junior are both full AI coworker agents that operate in both Slack and Microsoft Teams with 3,000+ tool integrations and proactive, memory-persistent behavior. Viktor’s documented differentiators include a 3,200+ integration catalog, a per-workspace cloud Linux sandbox for code execution and file system access, professional deliverable generation (PDFs, slide decks, web applications), and a credential injection architecture that keeps API keys off the model entirely. Junior’s documented differentiators include a named AI employee setup with its own user account and work email, a $100 free trial credit with no credit card, and strong documentation of sales and media buyer workflow automation. Both are viable full coworker options; testing each on your actual workflow is the fastest evaluation path.
Does Microsoft 365 Copilot work with non-Microsoft tools?
No. Microsoft 365 Copilot operates on Microsoft 365 content: documents in SharePoint, messages in Teams, emails in Outlook, data in Excel. It does not natively connect to Salesforce, HubSpot, Stripe, Google Ads, Notion, or other non-Microsoft business tools. Teams with hybrid stacks that include non-Microsoft software will hit Copilot’s scope limits for cross-tool tasks and need a tool like Viktor or Junior to cover those integrations.
Is Slack AI worth it at $15 per user per month?
Slack AI is worth the Business+ plan price ($15 per user per month) if your team’s primary friction is information overload inside Slack: missed context across too many channels, difficulty finding past decisions, or losing track of conversation threads. The AI search, channel recaps, and thread summaries directly address those problems. It is not worth it as a substitute for an AI agent that takes external actions, because Slack AI does not connect to any external tool and takes no actions outside Slack. Many teams find value in Slack AI for internal knowledge management alongside a separate AI coworker agent for external tool execution.
What does Zapier do in Slack and Teams that AI coworker agents do not?
Zapier handles high-volume, deterministic trigger-action flows with reliability that general-purpose AI agents are not designed for. A Zap that fires 500 times a day on a specific trigger (new Stripe payment creates a Slack notification) runs consistently with no reasoning overhead. AI coworker agents like Viktor and Junior are designed for variable, judgment-requiring tasks rather than high-frequency, pre-specified triggers. Many teams use both: Zapier for the predictable, high-frequency automation layer and an AI coworker agent for analysis, reporting, and tasks that require reasoning across changing inputs.
Can AI coworker agents access private Slack channels and Teams conversations?
This depends on the specific tool and how it is configured. Viktor uses a secure credential injection architecture where it does not directly see API keys, and sensitive actions require explicit approval buttons in Slack. Junior installs in channels you explicitly assign. Neither tool has blanket access to all private channels by default; access is scoped to the channels and integrations the workspace administrator configures. For enterprise deployments requiring specific data governance or privacy controls, both Viktor and Junior have enterprise security documentation covering access scope and data handling.
Which AI coworker agents work in both Slack and Microsoft Teams?
Viktor, Junior, Zapier, Glean, and Moveworks all support both Slack and Microsoft Teams. Slack AI is Slack-only. Microsoft 365 Copilot is Teams and Microsoft 365-only. Dust primarily supports Slack with Teams integration in development. Claude Tag (Anthropic’s autonomous @Claude agent) was in Slack-only beta as of mid-2026 with no Teams version announced. For organizations that use both Slack and Microsoft Teams across different teams or have not yet standardized on a single platform, Viktor and Junior are the two full-coworker options with verified support for both.
