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The AI stack

The whole five-layer mapL3InfrastructureL4Models & toolingL5Applications

Categories

Local & Sovereign AINotes & KnowledgeObservability & MonitoringPassword ManagersWeb AnalyticsTeam ChatSmart HomeNetworking & RoutersVideo ConferencingCloud Storage & SyncPhotos & MediaAPI DevelopmentImage EditingWorkflow Automation & iPaaSDeveloper Tools & ContainersOffice & Productivity SuitesNo-Code DatabasesCode Hosting & Git ForgesProject ManagementEmail Marketing & NewslettersScheduling & BookingError Tracking & Exception MonitoringLog Management & SIEMVPN & PrivacyEmail & Secure MailVector Databases & AI SearchLLM & Agent FrameworksDomains & Web HostingData Removal & PrivacyAuthentication & IdentityHelp Desk & Customer SupportCloud & VPSKubernetes & Container PlatformsEmbedding ModelsPDF & DocumentsAI Coding AssistantsAI Voice & SpeechLLM Observability & EvaluationLLM Gateways & RoutingCloud GPU & AI ComputeCI/CD & build automationData & pipeline orchestrationModel serving & inferenceAI agent frameworksBackend as a serviceSecrets managementFeature flags & experimentationProduct analyticsSearch infrastructureUptime & status monitoringAffiliate & partner platformsVisitor identification & personalisationWikis & internal docsIdentity & access managementData warehouses & analytics enginesCustomer data platformsCRMObject storageBI & dashboardsE-signatureWhiteboards & diagrammingIn-memory data stores & cachingPlatform as a serviceTransactional & bulk emailHeadless CMSDesign & prototypingE-commerce platformsInternal tools & admin panelsManaged databasesForms & surveysFine-Tuning & Model TrainingRAG & Retrieval PlatformsLLM Evaluation & TestingAI Guardrails & Content SafetySpeech Recognition & TranscriptionExperiment Tracking & ML OpsDocument AI & OCR

About

How we rank & score
Best of · 3 tools ranked

The best Team Chat

Every option ranked — open-source, self-hostable, and commercial — by our transparent Sovereignty Score, with honest trade-offs so you choose what fits you, not us.

Own your team's communication on infrastructure you run.

L5Applications — layer 5 of the AI stack
  1. 1

    Mattermost

    Top pickOpen source

    Self-hosted team chat built for security-conscious orgs.

    Free self-host; paid Enterprise · in our Slack comparison →

    88
    sovereignty
    What is Mattermost? →
  2. 2

    Zulip

    Open source

    Threaded team chat that keeps conversations organized.

    Free self-host; paid cloud · in our Slack comparison →

    88
    sovereignty
    What is Zulip? →
  3. 3

    Rocket.Chat

    Open source

    MIT-licensed, highly customizable team communication.

    Free self-host; paid cloud/enterprise · in our Slack comparison →

    85
    sovereignty
    What is Rocket.Chat? →

Replacing a specific tool?

Head-to-head comparisons for each popular team chat product.

Alternatives to Slack

3 vetted options · top pick Mattermost

Straight head-to-heads

Two team chat tools, side by side — verified facts and a plain verdict.

Mattermost vs Zulip→Mattermost vs Rocket.Chat→Zulip vs Rocket.Chat→
The Macrostack brief

New swaps, worth your inbox.

A short, occasional email when we add a high-intent alternative or ship a new head-to-head. No spam, no selling your address — unsubscribe in one click.