Element, Mattermost, and Nextcloud Talk all let organizations run team communication on their own infrastructure instead of a vendor's cloud, but they solve…
Open Source / Freemium (free self-hosted Community edition plus paid Enterprise and Sovereign tiers) · From Free (self-hosted Community edition); Enterprise and Sovereign pricing available on request
Best for: Privacy-focused organizations, government agencies, and communities that want federated, end-to-end encrypted chat with the flexibility to interoperate across independently run servers.
Freemium · From Free (Starter, self-hosted); Professional from $10/user/month
Best for: Engineering, DevOps, and incident-response teams that want Slack-style self-hosted chat paired with Playbooks for structured, repeatable workflows.
Best for: Organizations already running Nextcloud, or those under GDPR, who want video and chat bundled with file sharing and document collaboration in one self-hosted suite.
At a Glance
Element
Mattermost
Nextcloud Talk
Primary category
Team Chat
Team Chat
Team Chat
Rating
Not documented
Not documented
Not documented
Pricing model
Open Source / Freemium (free self-hosted Community edition plus paid Enterprise and Sovereign tiers)
Freemium
Open Source
Starting price
Free (self-hosted Community edition); Enterprise and Sovereign pricing available on request
Free (Starter, self-hosted); Professional from $10/user/month
Free
Free plan
Yes
Yes
Yes
Free trial
Not documented
Not documented
Not documented
Platforms
Web, iOS, Android, Mac, Windows
Web, iOS, Android, Mac, Windows
iOS, Android, Mac, Windows
Team collaboration
Not documented
Not documented
Not documented
AI features
Not documented
Not documented
Yes
Public API
Yes
Not documented
Not documented
Standout Differences
Federation is Element's defining trait
Element is built on the open Matrix protocol, so organizations can self-host a homeserver that still interoperates with other Matrix servers, a capability neither Mattermost nor Nextcloud Talk offers.
Element
Mattermost turns chat into workflow automation
Playbooks let Mattermost teams trigger a dedicated channel with tasks, owners, and status tracking for incident response or onboarding, a feature not present in Element or Nextcloud Talk.
Mattermost
Nextcloud Talk ships inside a full collaboration suite
Calls and chat sit alongside file sharing and document editing in the same Nextcloud interface, so teams already using Nextcloud get communication without adding a separate app.
Nextcloud Talk
All three avoid per-user SaaS lock-in
Each tool ships a free, self-hostable core under an open-source license, letting organizations run production chat without a mandatory per-seat subscription.
Element, Mattermost, Nextcloud Talk
Encryption depth varies sharply
Element enables end-to-end encryption by default in private rooms and Nextcloud Talk offers optional end-to-end encrypted calls, while Mattermost's provided feature set centers on transport-level security rather than native end-to-end message encryption.
Element, Mattermost, Nextcloud Talk
Feature-by-Feature
Security and Architecture
Feature
Element
Mattermost
Nextcloud Talk
End-to-end encrypted messaging or calls
Available
Unavailable
Available
Federated, multi-server architecture
Available
Unavailable
Unavailable
Deployment and Administration
Feature
Element
Mattermost
Nextcloud Talk
Self-hosted deployment
Available
Available
Available
Free tier without a hard user cap
Limited
Available
Available
SSO or LDAP/Active Directory sync
Limited
Limited
Limited
Collaboration Features
Feature
Element
Mattermost
Nextcloud Talk
Built-in voice and video calling
Available
Available
Available
Checklist-driven workflow automation
Unavailable
Available
Unavailable
Bundled file sharing and document editing
Unavailable
Unavailable
Available
Pricing Compared
Starting price reflects the lowest paid tier, not the full cost for every team size or usage level.
Element
Community — Free n/a
Enterprise — Custom (per seat/month) monthly
Sovereign — Custom (per deployment) custom
Mattermost
Starter — Free N/A
Professional — $10/user/month annual
Enterprise — Custom annual
Nextcloud Talk
Community — Free Free
Enterprise Subscription — Custom Annual, from 100 users
Pros & Cons
Element
Pros
Fully open source under the AGPL with no artificial caps on users, messages, or core features, even on the free self-hosted tier.
Decentralized, federated architecture gives organizations full control over data residency, unlike single-vendor centralized platforms.
End-to-end encryption is enabled by default in private rooms, backed by a well-regarded cryptographic protocol design.
Strong track record with government and defense customers, including deployments in France and Germany, validating its security posture.
Cons
Self-hosting a Synapse homeserver requires meaningful technical expertise and ongoing infrastructure maintenance.
Enterprise and Sovereign tier pricing is not published and requires contacting sales, complicating budget comparisons against competitors.
The federated architecture and richer feature set can feel more complex than simpler, purely consumer-focused apps like Signal.
Some advanced enterprise features, such as SLAs and directory integration, are reserved for paid tiers rather than the free Community edition.
Mattermost
Pros
Fully open-source core with self-hosted and air-gapped deployment options
Strong fit for regulated industries, government and defense customers
Playbooks provide built-in workflow automation not native to Slack
Deep integrations with developer and DevOps tooling
Lightweight architecture (single Go binary) makes self-hosting comparatively simple
Cons
Smaller app/integration marketplace than Slack or Microsoft Teams
Enterprise pricing is custom-quoted and not publicly transparent
Self-hosting requires ongoing server maintenance and updates
UI and mobile experience is generally considered less polished than Slack
Annual prepaid billing only for official Professional and Enterprise licenses, no monthly option
Nextcloud Talk
Pros
Fully self-hosted, giving organizations complete control over data and infrastructure
Core software is free and open source under the AGPL license
Tight integration with the rest of the Nextcloud collaboration suite
End-to-end encryption option for sensitive communications
Scales from small 1:1 calls to large webinars using the High Performance Backend
Cons
Requires self-hosting or a hosting partner rather than a plug-and-play SaaS signup
Call quality and scale depend on server resources unless the paid HPB add-on is used
Feature depth for large-scale webinars still lags dedicated tools like Zoom
Enterprise support pricing is not published and requires contacting sales
Mobile and desktop app polish is less mature than commercial competitors
Use Cases
Choose Element: Privacy-focused organizations, government agencies, and communities that want federated, end-to-end encrypted chat with the flexibility to interoperate across independently run servers.
Choose Mattermost: Engineering, DevOps, and incident-response teams that want Slack-style self-hosted chat paired with Playbooks for structured, repeatable workflows.
Choose Nextcloud Talk: Organizations already running Nextcloud, or those under GDPR, who want video and chat bundled with file sharing and document collaboration in one self-hosted suite.
Element
Self-Hosted Team Chat — Organizations run their own Synapse homeserver to replace Slack or Teams with a fully self-controlled, encrypted messaging platform.
Sovereign Government Communications — Government agencies and defense organizations deploy Element's Sovereign tier for air-gapped, high-security internal messaging.
Cross-Organization Federated Messaging — Businesses and communities use Matrix's federation to communicate across independently hosted servers without relying on a single vendor.
Mattermost
Incident response and DevOps workflows — Engineering teams use Playbooks to coordinate incident response with automated checklists and dedicated channels.
Regulated and government communication — Public-sector and financial-services organizations need self-hosted or air-gapped messaging to meet compliance requirements.
Secure internal team chat — Organizations that want Slack-like messaging while keeping full control of where data is stored.
Nextcloud Talk
Data-Sovereign Video Conferencing — Government agencies and EU public-sector organizations use Nextcloud Talk to keep video and chat data on infrastructure they control.
Integrated Collaboration for Nextcloud Users — Organizations already using Nextcloud for file sync add Talk for calls and chat without adopting a separate tool.
Replacing Commercial Conferencing Tools — IT teams self-host Talk to reduce reliance on commercial video conferencing subscriptions.
Frequently Asked Questions
Which of these three offers real end-to-end encryption?
Element enables end-to-end encryption by default in private rooms using the Olm and Megolm ratchets, and Nextcloud Talk offers optional end-to-end encrypted calls on web and desktop. Mattermost's documented feature set focuses on transport-level and at-rest security rather than native end-to-end encrypted messaging.
Can any of these run without hitting a user cap on the free tier?
Mattermost's free Starter edition and Nextcloud Talk's free Community edition don't publish a hard user cap, while Element's free Community tier is aimed at self-hosted deployments of up to roughly 100 users before Enterprise pricing applies.
Which tool is best for incident response workflows?
Mattermost is the clear fit here, thanks to Playbooks, which automatically creates a dedicated channel with tasks, owners, and status tracking when a workflow is triggered. Neither Element nor Nextcloud Talk offers an equivalent built-in workflow automation feature.
Do any of these tools federate with servers run by other organizations?
Only Element does, because it's built on the open Matrix protocol. Mattermost and Nextcloud Talk are designed as standalone, single-organization deployments without federation between separate instances.
Which integrates most tightly with existing file storage and document tools?
Nextcloud Talk, since it ships as part of the broader Nextcloud platform and shares its interface with file sync, sharing, and Nextcloud Office document editing.
Is there a hosted option for teams that don't want to manage their own servers?
Yes for all three: Element offers Element Enterprise Cloud, Mattermost offers Mattermost Cloud, and Nextcloud offers its own hosted Nextcloud.online option alongside hosting partners, so teams can trade some self-hosting control for a managed service.