8 Best Copilot Alternatives That Work Across Gmail, Slack, and Teams

Microsoft Copilot helps teams inside Outlook and Teams. Google Gemini works smoothly within Gmail and Workspace. But what happens when your team uses both ecosystems, plus Slack? The reality is that most organizations operate across multiple platforms, creating gaps that single-ecosystem AI assistants simply cannot fill. This guide examines eight alternatives that address the cross-platform challenge, starting with this+that, the only AI productivity platform built specifically for teams working across Gmail, Outlook, Slack, Microsoft Teams, Google Chat, and Telegram simultaneously.

Key Takeaways

• Cross-platform coverage separates true alternatives from ecosystem-locked tools: this+that is the only solution offering native integration across Gmail, Outlook, Slack, Teams, Google Chat, and Telegram in a single platform, while Copilot works exclusively within M365 and Gemini stays within Google Workspace
• Tool consolidation creates compound savings: this+that replaces functionality across four separate vendors (booking tool, task manager, automation tool, team wiki), delivering net cost reduction rather than incremental expense
• No migration required for cross-platform solutions: Unlike switching email clients, this+that connects to existing Gmail, Outlook, Slack, and Teams accounts without forcing platform changes or data migration

Beyond Microsoft: Understanding the Need for Cross-Platform AI Productivity Tools

The fundamental challenge with ecosystem-locked AI assistants is that modern work does not happen in a single vendor’s environment. Teams receive requests via Gmail, collaborate in Slack, join meetings on Teams, and track projects across multiple tools. When your AI assistant only understands one slice of this communication landscape, critical context gets lost.

Microsoft Copilot is designed for Microsoft tools, leaving Gmail and Slack users without AI support. Google Gemini provides excellent capabilities within Workspace but offers nothing for Teams or Outlook users. Even premium email clients like Superhuman focus narrowly on inbox management without touching chat platforms where significant work coordination happens.

This fragmentation forces teams to either:

• Choose one ecosystem and accept blind spots in other platforms
• Run multiple AI assistants with inconsistent context and duplicate costs
• Build custom integrations that require ongoing engineering maintenance

The cross-platform gap represents an architectural limitation, not a feature that vendors will simply add later. Microsoft has no incentive to make Copilot work beautifully with Google products, and vice versa. Teams needing unified AI across communication channels require purpose-built solutions like this+that’s unified inbox.

1. this+that

this+that stands alone as the only AI productivity platform connecting Gmail, Outlook, Slack, Microsoft Teams, Google Chat, and Telegram into a unified workflow. While competitors lock users into single ecosystems, this+that meets teams where they actually work.

Key Features

• Native integration across six major communication platforms without custom development: Connect Gmail, Outlook, Slack, Microsoft Teams, Google Chat, and Telegram simultaneously through OAuth connections that require no engineering resources or custom API work.
• Brain automatically extracts six task types - requests, decisions, follow-ups, deadlines, commitments, and approvals: The system analyzes all connected communication channels and identifies actionable items, organizing them by type for immediate visibility and action.
• DoBox provides unified task view across all connected channels: All extracted tasks from every platform appear in a single interface, eliminating the need to check multiple applications for pending work items.
• Workflows allow plain-English automation descriptions that generate complete multi-tool processes: Describe desired automations in natural language and the system creates executable workflows connecting multiple tools without traditional automation configuration.
• Built-in MCP servers enable advanced AI context capabilities including GitHub, Jira, and Notion integration: Model Context Protocol servers provide deep integration with development, project management, and documentation tools for comprehensive workflow coverage.
• DoBox for Gmail Chrome extension shows extracted tasks directly within Gmail sidebar: View all action items from every connected channel while working in Gmail, providing context without switching applications.

Best For

this+that is used by teams employing any combination of Gmail, Outlook, Slack, Teams, or Google Chat who need unified AI assistance across all communication channels without vendor lock-in. The platform requires no installation beyond browser extensions or OAuth connections, enabling setup in under a minute. Workflows learn from execution and feed insights back to Brain, creating a self-improving system that gets smarter over time without manual updates.

2. Microsoft Copilot

Microsoft Copilot provides deep integration inside Word, Excel, PowerPoint, Outlook, and Teams that no third-party can match. For organizations standardized entirely on Microsoft 365, Copilot embeds AI directly into daily workflows.

Key Features

• Native embedding inside all Microsoft 365 applications: AI capabilities appear directly within Word, Excel, PowerPoint, Outlook, and Teams interfaces, eliminating context switching between tools and AI assistance.
• Meeting summarization and action item extraction in Teams: Automatically generates meeting summaries, identifies key decisions, and extracts action items from Teams meetings without manual note-taking.
• Document drafting and editing assistance in Word: Provides content generation, rewriting suggestions, and editing support directly within Word documents based on prompts and context.
• Data analysis and formula generation in Excel: Analyzes spreadsheet data, suggests insights, and generates complex formulas based on natural language descriptions of desired calculations.
• Email composition and thread summarization in Outlook: Drafts email responses, summarizes long email threads, and suggests replies based on message context and communication patterns.
• Enterprise security and compliance framework integration: Operates within Microsoft’s existing security boundaries, respecting data governance policies and compliance requirements without additional configuration.

Microsoft Copilot is used by organizations operating exclusively within Microsoft 365 environments with no Gmail, Slack, or Google Workspace in their technology stack. The platform requires Microsoft 365 licenses and operates only within the Microsoft ecosystem. Copilot fails to execute commands directly, often giving instructions instead of performing actions, with limited effectiveness outside M365 applications.

3. Google Gemini

Google Gemini excels at personal research and advice, leveraging Google’s search infrastructure to provide superior information retrieval. Within Google Workspace, Gemini integrates smoothly across Gmail, Docs, Sheets, Slides, and Meet.

Key Features

• Superior web search and research capabilities: Leverages Google’s search technology to provide comprehensive research results, fact-checking, and information synthesis beyond standard AI models.
• Native Gmail, Docs, Sheets, Slides, and Meet integration: Works directly within Google Workspace applications, providing AI assistance without leaving familiar Google interfaces.
• Cleaner, more approachable interface for new users: Simplified user experience makes AI capabilities accessible to users without technical backgrounds or extensive AI tool experience.
• Free tier available with limited capabilities: Basic Gemini features accessible without payment, allowing evaluation before commitment to advanced tiers.

Google Gemini is used by teams standardized entirely on Google Workspace with no Microsoft or Slack tools in their technology stack. The platform is Workspace-centric, offering nothing for Teams, Outlook, or Slack users, and lacks advanced workflow automation capabilities compared to dedicated automation tools.

4. Superhuman

Superhuman has established itself as the fastest email client available. For users processing high volumes of email daily, Superhuman’s keyboard shortcuts and AI triage deliver measurable time savings.

Key Features

• Optimized speed with extensive keyboard shortcuts: Every email action can be performed via keyboard, eliminating mouse clicks and significantly reducing time per email processed.
• AI email prioritization and triage: Automatically identifies important messages, surfaces urgent items, and deprioritizes less critical emails based on patterns and content analysis.
• Split inbox for efficient email processing: Separates email into prioritized categories, allowing focused processing of important messages before handling lower-priority items.
• Snippets and templates for rapid responses: Pre-configured text blocks and response templates enable quick replies to common email types without repetitive typing.
• Read status tracking: Shows when recipients open emails, providing visibility into message delivery and engagement.
• Gmail and Outlook support: Works with both major email platforms, though focus remains exclusively on email without chat integration.

Superhuman is used by high-volume email users who process significant message volumes daily and do not need chat or workflow integration. The platform focuses exclusively on email with no Slack or Teams integration, and the narrow scope may be expensive when teams also need AI assistance for chat and workflow automation.

5. Lindy AI

Lindy positions itself as a flexible AI agent platform supporting connections to numerous applications. The platform enables custom agent workflows that operate across multiple SaaS tools.

Key Features

• Extensive app integrations claimed: Supports connections to numerous business applications, enabling cross-tool workflows and data synchronization.
• Custom AI agent creation: Build specialized agents for specific tasks or workflows, tailoring behavior to organizational needs and processes.
• Knowledge base capabilities: Agents can access and leverage organizational knowledge bases, documentation, and information repositories for informed responses.
• Gmail and Outlook support: Connects to both major email platforms, providing email-based workflow triggers and actions.
• Flexible workflow automation: Create multi-step automations connecting different applications based on triggers, conditions, and desired outcomes.

Lindy AI is used by power users willing to invest time in custom agent configuration who need extensive automation across multiple tools. Configuration requires more setup time compared to turnkey solutions, and the platform is individual-focused rather than team collaboration oriented.

6. Shortwave

Shortwave offers AI-powered email management specifically for Gmail users at accessible price points, making it suitable for individuals and small teams prioritizing cost over cross-platform coverage.

Key Features

• AI email summarization: Automatically generates summaries of long email threads, helping users quickly understand conversations without reading every message.
• Smart search functionality: Enhanced search capabilities using AI to find relevant emails based on natural language queries and contextual understanding.
• Clean, modern interface: Redesigned email experience with simplified navigation and reduced visual clutter compared to standard Gmail interface.
• Gmail-native experience: Built specifically for Gmail, providing deep integration with Google’s email platform and maintaining familiar Gmail workflows.

Shortwave is used by budget-conscious Gmail users who do not need Outlook, Slack, or Teams integration. The platform has a Gmail-only focus with no cross-platform support and limited workflow automation compared to comprehensive platforms.

7. Gmelius

Gmelius specializes in turning Gmail into a collaborative workspace with shared inboxes, email assignment, and team workflows built specifically for Gmail environments.

Key Features

• Shared inbox management: Multiple team members can access and manage shared email addresses, providing collaborative email handling for support, sales, or general inquiries.
• Email assignment and tracking: Assign specific emails to team members, track status, and ensure accountability for responses and follow-ups.
• Internal notes on email threads: Add private team comments to email conversations, enabling collaboration and context sharing without external visibility.
• Email templates and automation: Create reusable response templates and automate routine email workflows to improve efficiency and consistency.
• Kanban boards for email: Visualize email workflows using card-based boards, moving messages through stages like tickets in project management tools.
• Gmail-native experience: Operates entirely within the Gmail interface, maintaining familiar workflows while adding team collaboration features.

Gmelius is used by Gmail-only teams needing shared inbox collaboration without cross-platform requirements. The platform is exclusively Gmail-focused with no Outlook, Slack, or Teams capabilities, and more focused on email collaboration than AI-powered task extraction and automation.

8. Slack AI

Slack AI provides channel summarization and intelligent search directly within Slack, helping teams catch up on missed conversations and find information across channel history.

Key Features

• Channel and thread summarization: Automatically generates summaries of conversations in channels and threads, helping users catch up on discussions they missed.
• Intelligent search across Slack history: Enhanced search using AI to find relevant messages, files, and conversations based on natural language queries and context.
• Recap features for time away: Provides personalized summaries of activity across channels while users were offline, highlighting important mentions and updates.
• Native Slack integration: Built directly into Slack interface, providing AI features without leaving the platform or installing additional tools.
• Included in Business+ plans: Available as part of higher-tier Slack subscriptions without additional per-feature costs.

Slack AI is used by teams already on Slack Business+ who want channel summarization without additional tools. The platform operates exclusively within Slack, leaving email and other communication platforms completely unassisted, so teams using Slack alongside Gmail or Outlook still need separate solutions for email productivity.

Frequently Asked Questions

What are the main differences between Copilot and its cross-platform alternatives?

Microsoft Copilot integrates deeply within Microsoft 365 applications but works exclusively within that ecosystem. Cross-platform alternatives like this+that connect multiple communication platforms simultaneously, including Gmail, Outlook, Slack, and Teams, without requiring users to standardize on a single vendor. The key difference is architectural: Copilot embeds within M365 apps while this+that layers across existing tools without forcing migration.

How can AI tools effectively manage tasks across Gmail, Slack, and Teams simultaneously?

Effective cross-platform AI requires unified data architecture that normalizes messages from different platforms into a consistent format. this+that accomplishes this through its Brain feature, which automatically extracts six task types (requests, decisions, follow-ups, deadlines, commitments, and approvals) from connected channels. The DoBox then presents these extracted items in a single view regardless of source platform, eliminating the need to check multiple applications for pending work.

Which AI productivity tool is best for small to mid-sized teams needing unified workflow management?

this+that provides strong value for SMB teams, offering cross-platform coverage that would otherwise require subscribing to multiple tools. The platform consolidates functionality that typically requires four separate vendors. For teams using mixed communication platforms, this unified approach delivers both capability and cost advantages over ecosystem-locked alternatives.

How do these AI tools ensure data privacy when connecting to multiple communication channels?

Each platform handles security differently. this+that connects via OAuth without requiring password sharing and maintains security practices designed for enterprise deployment. Microsoft Copilot operates within Microsoft’s existing compliance framework, while Google Gemini leverages Workspace security controls. Teams should evaluate each vendor’s security documentation against their specific compliance requirements before connecting sensitive communication channels.