Fleep vs Mattermost (2026): which should you pick?

Pick Fleep if

• Fits if you want tasks sitting right inside your chats
• Makes sense if you talk to people at other companies who also use Fleep

Look elsewhere if

• Skip it if you want a free plan, as there is only a two-week trial
• Tight if you need built-in calls, because they run through Whereby
• Pricey if you pay monthly, as only the yearly €5 price is shown
• Watch out: prices are in euros and Enterprise is quoted with no published price

Pick Mattermost if

• Fits if your chat has to stay on your own servers or on an air-gapped network
• Works for technical teams who can run and maintain their own server

Look elsewhere if

• Skip it if nobody on the team wants to run a server, as it's self-hosted by design
• Not for you if you want to see a price before talking to anyone, because every paid license is quoted by sales
• Tight if you rely on the free Entry mode, which only shows the latest 10,000 channel messages and has community support
• Watch out: Team Edition has no single sign-on, and the vendor doesn't recommend it for sensitive work
• Pricey if you need workflow automation or boards, as both start on Enterprise, sold as prepaid annual seats

Fleep

• There is no free plan; paid access follows a two-week trial.
• The pricing page shows only the yearly-billed €5 price; the monthly-billing price is not displayed.
• Voice and video calls depend on Whereby rather than being built in.
• Prices are shown in euros.

Mattermost

• No prices are published: Professional, Enterprise and Enterprise Advanced are quoted by sales and sold as prepaid annual seat subscriptions.
• Entry shows only the latest 10,000 channel messages and has community support only; the vendor suggests it for teams of fewer than 50 users.
• It is self-hosted by design; the only vendor-hosted option described is single-tenant Mattermost Cloud Enterprise, arranged through sales.
• Team Edition has no single sign-on, and the vendor does not recommend it for government or sensitive commercial workloads.

Fleep

Task board per conversation

Every conversation has a taskboard for creating tasks, assigning them and tracking progress.

Pinboard

Pin plans and announcements to a conversation so everyone sees the same decisions.

Email in chat

Send and read email from inside Fleep, and message partner companies that also use Fleep as if they were colleagues.

Presence and read indicators

Shows when someone was last active, who has read a message and who is writing a reply.

Calls through Whereby

Conversations are text-based; audio and video calls and screen sharing start through the Whereby integration.

Admin and API

Admins manage employee accounts and company conversations, and a public API reads and posts messages and files.

Mattermost

Channel-based messaging

1-1 and group messages, public and private channels, threaded discussions, file sharing and search across web, desktop and mobile, in 20 languages.

Playbooks

Repeatable playbooks for incident response, change management and compliance, with conditional checklists and escalation. The pricing page lists workflow automation from Enterprise.

Calls and screen sharing

1:1 audio calls with screen sharing are in every paid package, and group calls support about 50 concurrent users per self-hosted server. A 40-minute call limit is planned for Entry.

Boards

Kanban, table, calendar and gallery boards for assigning and tracking tasks next to the conversation. The pricing page lists work management from Enterprise.

AI agents

Agents summarize conversations and take actions using an LLM provider the customer chooses, or a self-hosted model in air-gapped environments.

Integrations and API

A REST API with an OpenAPI 3.0 spec, webhooks, slash commands and a plugin platform, with prebuilt integrations for tools such as Jira, GitHub and GitLab.

Fleep

• Business€5

  per user / month, billed annually

  Unlimited conversations and history, 100 GB of file space per user, tasks, pinboard, teams and email in Fleep.

• EnterpriseCustom

  Same feature list as Business for large organizations; price is quoted per user and not published.

Mattermost

• Entry$0

  Free mode of the Enterprise Edition: Enterprise Advanced features with 10,000 viewable messages, community support, and no compliance or high availability.

• Team Edition$0

  Open-source, MIT-licensed edition for small teams and personal use under 250 activated users, without single sign-on.

• ProfessionalCustom

  For teams of up to 250 users: single sign-on, AD/LDAP sync, guest accounts and next-business-day support. Sold as prepaid annual seats.

• EnterpriseCustom

  Adds workflow automation, work management boards, compliance and data retention tools, federated communications and high availability.

• Enterprise AdvancedCustom

  Adds zero-trust attribute-based access controls, classification banners, burn-on-read messages and support for air-gapped environments.

Fleep

• Annual discount

  Save 30% with annual billing

  Fleep says annual payment is the default and saves 30% against paying monthly, which is available from day one.

Mattermost

• Nonprofit

  3-year Professional license for $250

  Eligible nonprofit and open-source organizations can apply for a 3-year self-hosted Mattermost Professional subscription for up to 1,000 users for a $250 fee.