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Best alternatives to Slack

Discover open-source, free tier, and premium alternatives to Slack. Compare scores, pros/cons, and deployment paths instantly.

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M

Microsoft Teams

Alternative to Slack

SubscriptionEnterpriseCloud-Native / SaaSProprietaryPublic APIWebhooksPluginsSDK
GitHubJiraSlackGoogleAzureOkta

Best for

Microsoft 365 enterprises

Cost

Included with many Microsoft 365 business and enterprise plans; advanced meeting and compliance features require higher-tier subscriptions.

Summary

Enterprise collaboration platform with built-in meeting recording, screen sharing, and cloud video storage for teams already standardized on Microsoft 365.

Why Switch

Often chosen over Slack when teams need native Microsoft 365 integration, enterprise compliance controls, and bundled E5 licensing economics.

SOC2GDPR

Migration Playbook

  1. Export Slack workspace data using Slack's Export tool to obtain JSON files containing messages, channels, and user information. Map Slack channels to Microsoft Teams teams and channels, ensuring user email addresses correspond to Microsoft 365 accounts.
  2. Use Microsoft Teams PowerShell module or Microsoft Graph API to create teams and channels based on the exported Slack channel data. Import user memberships by matching Slack user IDs to Azure AD user IDs to assign appropriate permissions and roles.
  3. Migrate files shared in Slack by downloading them from Slack's export and uploading them to the corresponding Microsoft Teams channels' SharePoint document libraries via Microsoft Graph API, maintaining folder structures and file metadata where possible.

Pros

  • 🟢Strong enterprise adoption and admin controls
  • 🟢Seamless integration with Outlook, SharePoint, and OneDrive
  • 🟢Meeting recording and sharing are easy for internal teams

Cons

  • 🔴Less focused on asynchronous video messaging than Loom
  • 🔴Can feel heavy for simple quick-record workflows
  • 🔴Best value depends on existing Microsoft licensing

0 builders switched

Go to Microsoft Teams
M

Mattermost

Alternative to Slack

Open SourceHybridOpen CorePublic APIWebhooksPluginsSDK
GitHubGitLabJiraSlackOkta

Best for

Regulated or self-hosting technical teams

Cost

Open-source self-hosted edition available; commercial cloud and enterprise plans add advanced security and compliance features.

Summary

Open-source team messaging platform focused on secure, self-hosted collaboration for technical and regulated environments.

Why Switch

Often chosen over Slack when security teams require data residency, air-gapped deployment, or full control over messaging infrastructure.

SOC2GDPR

Migration Playbook

  1. Export Slack workspace data using Slack's Export tool to obtain JSON files containing messages, channels, users, and files. Map Slack channels to Mattermost channels, Slack users to Mattermost users, and Slack messages to Mattermost posts.
  2. Use Mattermost's Import API or the Mattermost Import Tool to import users first by creating user accounts with corresponding usernames and email addresses from the Slack export. Then import channels by creating new channels in Mattermost matching the Slack channel names and types (public/private).
  3. Import Slack messages and files into the corresponding Mattermost channels using the Mattermost Import API, ensuring timestamps, user IDs, and message content are preserved. Upload files to Mattermost's file storage and link them appropriately within messages.

Pros

  • 🟢Self-hosting and data control for privacy-sensitive organizations
  • 🟢Good fit for engineering and operations teams
  • 🟢Enterprise features for compliance, auditing, and governance

Cons

  • 🔴Smaller ecosystem than Slack or Teams
  • 🔴Requires more administration if self-hosted
  • 🔴Less polished for broad consumer/community engagement

0 builders switched

Go to Mattermost
G

Google Chat

Alternative to Slack

SubscriptionEnterpriseCloud-Native / SaaSProprietaryPublic API
Google

Best for

Google Workspace-centric organizations

Cost

Included with Google Workspace plans; pricing depends on Workspace edition and admin/security requirements.

Summary

Business messaging and collaboration tool integrated with Google Workspace, offering spaces, direct messaging, and Meet integration for organizations already using Google apps.

Why Switch

Teams switch from Slack to Google Chat when they already rely on Google Workspace and want messaging that is bundled into their existing collaboration stack.

SOC2GDPR

Migration Playbook

  1. Export Slack data using Slack's Export tool to obtain JSON files containing messages, channels, and user information. Focus on exporting public channel conversations and user lists to ensure comprehensive data capture.
  2. Map Slack channels to Google Chat spaces by converting Slack channel names to Google Chat space names. Map Slack users to Google Workspace accounts using email addresses to maintain user identity consistency. Prepare message content by formatting Slack message JSON into Google Chat message API-compatible JSON, including timestamps and user mentions.
  3. Import the mapped data into Google Chat using the Google Chat API or Google Workspace Admin SDK. Create spaces corresponding to Slack channels via the API, add users to these spaces based on mapped user emails, and post historical messages using the Google Chat API's message creation endpoints to recreate conversation history.

Pros

  • 🟢Tight integration with Gmail, Drive, Docs, and Meet
  • 🟢Simple deployment for Google Workspace customers
  • 🟢Good fit for organizations standardized on Google cloud tools

Cons

  • 🔴Smaller app ecosystem than Slack or Teams
  • 🔴Less feature-rich for complex enterprise workflows
  • 🔴Adoption can be limited outside Google-centric environments

0 builders switched

Go to Google Chat
R

Rocket.Chat

Alternative to Slack

Open SourceHybridOpen CorePublic APIWebhooksPluginsSDK
GitHubGitLabJiraSlackOkta

Best for

Open-source community and support teams

Cost

Community/open-source edition available; paid cloud and enterprise offerings provide additional support and features.

Summary

Open-source communications platform for team chat, customer engagement, and self-hosted community messaging.

Why Switch

Teams switch from Slack to Rocket.Chat when they need more control over data, infrastructure, and customization than Slack typically offers.

SOC2GDPR

Migration Playbook

  1. Export Slack workspace data using Slack's Export tool to obtain JSON files containing messages, channels, users, and files. Specifically, export public channel conversations and user lists to ensure comprehensive data capture.
  2. Map Slack data fields to Rocket.Chat equivalents: map Slack channels to Rocket.Chat channels, Slack users to Rocket.Chat users (including usernames and email addresses), and Slack messages to Rocket.Chat messages, preserving timestamps and attachments metadata. Prepare the data in Rocket.Chat's import format, ensuring JSON structure compatibility.
  3. Import the prepared JSON data into Rocket.Chat using the Rocket.Chat Importer API or the built-in import tool. Upload channels, users, and messages sequentially to the Rocket.Chat server in the hybrid deployment environment, verifying data integrity and adjusting permissions as needed.

Pros

  • 🟢Flexible deployment options including self-hosting
  • 🟢Supports chat, channels, and external communication use cases
  • 🟢Useful for organizations wanting open-source control

Cons

  • 🔴UI and admin experience can be less refined than top commercial tools
  • 🔴Advanced features may require paid plans or technical setup
  • 🔴Smaller third-party integration ecosystem

0 builders switched

Go to Rocket.Chat
D

Discord

Alternative to Slack

Free TierProfessionalCloud-Native / SaaSFreemiumPublic APIWebhooksPluginsSDK
GitHubGitLabJiraSlackZapier

Best for

Startups, communities, and informal distributed teams

Cost

Free tier available; paid Nitro and server features are primarily consumer/community oriented, with limited formal enterprise controls compared with Slack.

Summary

Real-time messaging and voice platform originally popular with communities and gaming, now used by startups and distributed teams for lightweight chat, voice channels, and informal collaboration.

Why Switch

Teams switch from Slack to Discord when they want a lighter-weight, low-friction chat and voice experience with a generous free tier, even if it means giving up some of Slack's business governance features.

SOC2GDPR

Migration Playbook

  1. Export Slack data by using Slack's Export tool to download messages, files, and channel information in JSON format. Focus on exporting public channel messages and files, as private data may require additional permissions.
  2. Map Slack channels to Discord servers and channels by creating corresponding Discord servers and text channels. Use the Discord API to create channels with similar names and descriptions, and map Slack message timestamps, user IDs, and attachments to Discord message formats.
  3. Import the exported Slack messages and files into Discord by using Discord's API or third-party migration tools to post messages in the appropriate channels. Upload files to Discord channels and ensure message order and user attribution are preserved as closely as possible.

Pros

  • 🟢Fast, familiar real-time chat and voice experience
  • 🟢Generous free usage for small teams and communities
  • 🟢Easy to set up and adopt

Cons

  • 🔴Weaker enterprise governance and compliance than Slack
  • 🔴Less suited to regulated or formal business workflows
  • 🔴Integration and admin capabilities are not as business-focused

0 builders switched

Go to Discord

Community FAQ

Questions by product

Slack FAQ

Is it possible to self-host Slack or run it on a private server?

Slack is a proprietary, cloud-based platform and does not offer an official self-hosted version. All Slack workspaces run on Slack's servers, so self-hosting is not supported. Organizations requiring on-premises solutions typically look at alternatives like Mattermost or Rocket.Chat.

Community insight informed by Reddit discussions

Does Slack support offline message access or offline functionality?

Slack's desktop and mobile apps cache recent messages for offline viewing, but full offline functionality is limited. You cannot send messages or access complete message history without an internet connection. Offline capabilities depend on cached data and are not comprehensive.

Community insight informed by Hacker News discussions

Who owns the data uploaded and shared within Slack workspaces?

Data uploaded to Slack remains the property of the organization or user who owns it, but it is stored on Slack's servers under their terms of service. Slack provides enterprise-grade security and compliance features, but ultimate data control is limited by Slack's cloud infrastructure and policies.

Community insight informed by StackOverflow discussions

What are the main API limitations when integrating custom apps with Slack?

Slack's API has rate limits that vary by endpoint, typically allowing a few hundred to a few thousand requests per minute per workspace. The API also restricts access to certain message types and historical data depending on plan level. Some advanced features require paid plans and OAuth scopes.

Community insight informed by Forums discussions

How can I export or migrate Slack data if I want to switch platforms?

Slack provides export tools for workspace owners: Standard and Plus plans allow exporting public channel data, while Enterprise Grid plans can export all messages including private channels and DMs with approval. Exported data is in JSON format, which can be used for migration, but no official import tools exist for other platforms.

Community insight informed by Reddit discussions

Microsoft Teams FAQ

Can Microsoft Teams be self-hosted or run on-premises to maintain full data control?

Microsoft Teams is a cloud-first service tightly integrated with Microsoft 365 and does not support self-hosting or on-premises deployment. All data is stored in Microsoft's cloud infrastructure, so full data control requires relying on Microsoft’s compliance and data residency options rather than self-hosting.

Community insight informed by Reddit discussions

Does Microsoft Teams support offline access to chat and video recordings?

Microsoft Teams offers limited offline functionality. You can access previously downloaded files and cached chat messages offline, but live chat, new messages, and meeting recordings require an active internet connection. Video recordings are stored in OneDrive or SharePoint and require online access to stream or download.

Community insight informed by StackOverflow discussions

What are the limitations of Microsoft Teams APIs for integrating custom video messaging workflows?

Microsoft Teams APIs primarily focus on chat, channel management, and meeting scheduling. While you can access meeting recordings via Microsoft Graph API through OneDrive or SharePoint endpoints, there is no dedicated API for asynchronous video messaging or direct video recording control. Custom workflows often require combining Teams APIs with Microsoft 365 services.

Community insight informed by Hacker News discussions

How can organizations export or migrate video recordings and chat data from Microsoft Teams?

Organizations can export Teams data using Microsoft 365 Compliance Center eDiscovery tools, which allow exporting chat messages and files including video recordings stored in OneDrive or SharePoint. However, migration to non-Microsoft platforms can be complex and may require third-party tools to extract and convert data formats.

Community insight informed by Forums discussions

Mattermost FAQ

How complex is it to self-host Mattermost in a production environment?

Self-hosting Mattermost requires managing the application server, database (PostgreSQL or MySQL), and optionally Elasticsearch for full-text search. While Mattermost provides Docker images and Kubernetes manifests to simplify deployment, you still need to handle backups, scaling, SSL termination, and security hardening. For regulated environments, additional compliance configurations may be necessary. Overall, expect moderate operational overhead compared to SaaS solutions.

Community insight informed by Reddit discussions

Does Mattermost support offline messaging or local client caching when disconnected?

Mattermost clients support limited offline functionality such as reading previously loaded messages and composing drafts while offline. However, real-time messaging and synchronization require an active connection to the Mattermost server. There is no full offline mode with local message storage or peer-to-peer syncing.

Community insight informed by Hacker News discussions

What are the data ownership guarantees when self-hosting Mattermost?

When self-hosted, all message data, files, and metadata are stored on your own infrastructure, giving you full ownership and control. Mattermost does not process or store your data externally unless you integrate third-party services. This makes it suitable for organizations with strict data sovereignty and compliance requirements.

Community insight informed by StackOverflow discussions

Are there any significant limitations in the Mattermost API compared to Slack's API?

Mattermost offers a comprehensive REST and WebSocket API covering messaging, user management, and integrations. However, it lacks some advanced Slack features like granular event subscriptions, workflow automation, and a large ecosystem of third-party apps. The API is well-suited for custom integrations but may require more development effort to replicate Slack’s richer ecosystem.

Community insight informed by Forums discussions

What are the recommended methods to migrate data from Slack to Mattermost?

Mattermost provides an official Slack import tool that can migrate channels, direct messages, users, and files from Slack export archives. The tool supports most common Slack data but may not fully migrate apps, workflows, or message reactions. Post-import cleanup and user onboarding are typically required to complete the transition.

Community insight informed by Reddit discussions

Google Chat FAQ

Can I self-host Google Chat or run it on my own servers for full data control?

No, Google Chat is a fully managed SaaS product integrated within Google Workspace and does not support self-hosting. All data is stored on Google's cloud infrastructure, and there is no option to deploy or run the service on-premises or on private servers.

Community insight informed by Reddit discussions

Does Google Chat support offline messaging or working without an internet connection?

Google Chat offers very limited offline functionality. While you can read recent messages cached in the app, composing or sending new messages requires an active internet connection. Offline message drafting is not supported, so full offline usage is not feasible.

Community insight informed by Hacker News discussions

Who owns the data shared in Google Chat and how is it managed within Google Workspace?

Data in Google Chat is owned by the organization using Google Workspace and is subject to Google's data processing terms. Administrators have control over retention policies, data export, and compliance settings via the Google Workspace Admin console. Google acts as the data processor under these agreements.

Community insight informed by StackOverflow discussions

What are the limitations of the Google Chat API for integrating custom workflows?

The Google Chat API allows sending and receiving messages, creating bots, and managing spaces, but it lacks advanced workflow automation features found in other platforms. It does not support complex event triggers or deep integration with third-party enterprise systems natively, limiting its use for sophisticated automation.

Community insight informed by Forums discussions

Is there a way to export or migrate chat history out of Google Chat for archiving or switching platforms?

Google Workspace admins can export Google Chat data using Google Vault if enabled, which supports retention and eDiscovery but does not provide a straightforward export format for migration. There is no native tool for bulk exporting chat history for migration to other platforms, making migration complex.

Community insight informed by Reddit discussions

Rocket.Chat FAQ

How complex is it to self-host Rocket.Chat for a mid-sized team?

Self-hosting Rocket.Chat is moderately complex. It requires setting up a Node.js environment, MongoDB database, and optionally a reverse proxy like Nginx for SSL termination. Docker images are available which simplify deployment, but you still need to manage updates, backups, and scaling. For mid-sized teams, resource allocation and monitoring are important to maintain performance.

Community insight informed by Reddit discussions

Does Rocket.Chat support offline messaging or local caching when the client is disconnected?

Rocket.Chat clients do not support full offline messaging or local caching. Messages sent while offline are not queued locally; users must be connected to the server to send and receive messages. However, the server stores message history, so once reconnected, clients sync all missed messages.

Community insight informed by Forums discussions

Who owns the data in a self-hosted Rocket.Chat instance, and how is data privacy ensured?

In a self-hosted Rocket.Chat deployment, the organization running the server fully owns all data, including messages, files, and metadata. Data privacy depends on your server security practices, including encryption in transit (TLS), database security, and access controls. Rocket.Chat does not send data to third parties by default.

Community insight informed by Hacker News discussions

What are the limitations of Rocket.Chat’s REST and Real-time APIs for custom integrations?

Rocket.Chat offers REST and WebSocket real-time APIs that cover most chat functionalities like sending messages, managing users, and channels. However, some advanced features (e.g., live chat widgets, video conferencing) require additional setup or paid plans. Rate limiting and API stability can vary depending on your server resources and Rocket.Chat version.

Community insight informed by StackOverflow discussions

Is there a straightforward way to export or migrate chat history from Rocket.Chat to another platform?

Rocket.Chat provides export tools primarily for JSON or CSV formats of messages and user data, which can be used for backups or migration. However, there is no official one-click migration path to other chat platforms. Custom scripts or third-party tools are often needed to transform and import data into alternative systems.

Community insight informed by Reddit discussions

Discord FAQ

Is it possible to self-host Discord or run a private instance for full data control?

No, Discord is a proprietary SaaS platform and does not offer any self-hosting options. All messaging, voice, and data are hosted on Discord's servers, so you cannot run a private instance or self-host it to gain full data control.

Community insight informed by Reddit discussions

Does Discord support offline message access or local caching for when users are disconnected?

Discord clients cache recent messages locally to some extent, allowing limited offline viewing of recent chat history. However, full offline access or composing messages offline for later sending is not supported. You need an active internet connection for real-time sync and voice functionality.

Community insight informed by Hacker News discussions

What are the main limitations of Discord's API for building custom integrations or bots?

Discord's API is primarily focused on real-time messaging, voice state, and event-driven interactions. It has rate limits on requests, limited access to historical message data (only recent messages can be fetched), and no official support for exporting full server data. Bots cannot access deleted messages or user direct messages unless explicitly shared.

Community insight informed by StackOverflow discussions

How can I export or migrate data from Discord if I want to move to another platform?

Discord does not provide built-in tools for exporting full server data or chat history. You can manually copy messages or use third-party tools to scrape chat logs, but these methods are limited and may violate Discord's terms of service. For migration, you generally need to recreate channels and invite users manually on the new platform.

Community insight informed by Forums discussions

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