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AI Chatbots & Assistants Comparison

Glean vs. Open WebUI

At a glance

At a glance

Glean

Best for

Best for large organisations that want one assistant answering from every internal system without breaking the access rules those systems already enforce.

  • Enterprise

Open WebUI

Best for

Best for teams that want one self-hosted chat front end over local and cloud models, with the data staying on their own infrastructure.

  • Freelancers
  • Small and mid-sized
  • Enterprise

Cataleo does not name a winner. Both statements come from the vendors themselves.

Full Comparison

Criterion Glean Open WebUI
Starting price Not stated Free, self-hosted; enterprise licence quoted The community edition is free to deploy as-is with the Open WebUI branding kept. An enterprise licence is required to white-label or rebrand it or to use enterprise-only features, and is quoted against the number of seats.
Free trial Not stated Free community edition, self-hosted
Commercial use Yes, sold as an enterprise platform Not stated
Output Permission-aware answers with citations, documents, decks and dashboards A self-hosted chat interface over local and cloud models
API Yes: Chat, Search, Indexing and platform APIs, plus a Web SDK and an open-source Indexing SDK Yes, a REST API with an OpenAI-compatible chat completions endpoint and Anthropic-compatible messages endpoints
Hosting Cloud (SaaS) on Google Cloud, or customer-hosted as a managed single-tenant deployment inside your own Google Cloud or AWS environment Self-hosted by pip, uv, Docker or Kubernetes; runs fully offline and in air-gapped environments
Ecosystem 275+ connectors to work apps and data sources, including Slack, Google Drive, Jira, Confluence, SharePoint, GitHub and Salesforce Self-hosted web interface with a plugin and tool marketplace, plus companion projects Open Terminal for code execution, oikb for knowledge-base sync and mcpo for MCP-to-OpenAPI proxying
Live web search and sources Yes, answers draw on company and web knowledge, with citations Yes, through dozens of providers including SearXNG, Google PSE, Brave Search, Kagi, Mojeek, Tavily, Perplexity and Firecrawl, with results injected into the conversation
Files and long documents Yes, indexes documents across connected systems and enforces their existing permissions in every result Yes, local retrieval backed by nine vector databases, with several content-extraction engines and hybrid BM25 plus vector search with reranking
Images, voice and video Real-time voice interaction with the assistant; output formats include documents, decks, dashboards and podcasts Image generation through DALL-E, Gemini, ComfyUI and AUTOMATIC1111, plus hands-free voice and video calls with a choice of speech-to-text and text-to-speech engines
Coding help Yes, writes and explains code with the surrounding business context Open Terminal adds sandboxed files, a shell, code execution, previews and artifacts inside the chat
Model choice Yes, 40+ underlying LLMs are supported Yes, and it is the point: Ollama for local models and any OpenAI-compatible API, including LM Studio, GroqCloud, Mistral, OpenRouter and vLLM, mixed locally or in the cloud
Deployment Cloud (SaaS), Browser-based Browser-based, On-premise
Support more entries Email helpdesk, Community forum Community forum
Onboarding Documentation and knowledge base Documentation and knowledge base
Company size Enterprise more entries Freelancers, Small and mid-sized, Enterprise
Integrations Slack, Google Drive, Jira, Confluence, SharePoint, GitHub, Salesforce, Asana, Box more entries Ollama, OpenAI, Anthropic, LM Studio, GroqCloud, Mistral, OpenRouter, vLLM, ComfyUI, AUTOMATIC1111, SearXNG, Brave Search, Kagi, Tavily, Firecrawl, Docker, Kubernetes

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Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.

The short version

Key Differences

  • Deployment Glean Cloud (SaaS), Browser-based Open WebUI Browser-based, On-premise
  • Company size Glean Enterprise Open WebUI Freelancers, Small and mid-sized, Enterprise
  • Hosting Glean Cloud (SaaS) on Google Cloud, or customer-hosted as a managed single-tenant deployment inside your own Google Cloud or AWS environment Open WebUI Self-hosted by pip, uv, Docker or Kubernetes; runs fully offline and in air-gapped environments
  • Support Glean Email helpdesk, Community forum Open WebUI Community forum
  • Output Glean Permission-aware answers with citations, documents, decks and dashboards Open WebUI A self-hosted chat interface over local and cloud models

Every line is one datapoint from the table above, picked automatically. Nothing here is written text.

The trade-offs

Strengths and Limitations

Glean

Strengths

  • Answers are grounded in company systems and cite their sources
  • Permissions of the source systems are enforced, so nobody sees more than their access allows
  • 275+ connectors and support for 40+ underlying LLMs
  • Full developer surface: chat, search, indexing and agent APIs plus an embeddable Web SDK
  • ISO 42001, ISO 27001, SOC 2 Type II, HIPAA and GDPR listed

Limitations

  • No published pricing, so every evaluation starts with a sales conversation
  • Value depends on connecting enough systems, which makes rollout an integration project
  • Built for large organisations rather than individuals or small teams
  • Several newer capabilities, including multiplayer chats and multi-step workflows, are marked beta

Open WebUI

Strengths

  • Runs entirely on your own infrastructure, including fully offline and air-gapped
  • One interface over local Ollama models and any OpenAI-compatible API
  • Granular role-based access control and user groups for teams
  • Free to deploy as-is, with no seat cost
  • Its own OpenAI-compatible API, so other applications can call through it

Limitations

  • No hosted service: you run, secure and upgrade the infrastructure yourself
  • White-labelling or rebranding requires a quoted enterprise licence, and the community licence requires keeping the Open WebUI branding
  • Enterprise pricing is not published

Plans

Pricing

Open WebUI

  • Community $0 Free to deploy as-is, self-hosted, with the Open WebUI branding preserved.
  • Enterprise Not stated Quoted against the number of seats. Adds white-labelling, multi-node high availability, LDAP, Active Directory and SSO, audit logs and dedicated support.
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What users say

Review Scores · opens after launch

Glean

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Open WebUI

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Where this comes from

Where this comes from

Glean https://www.glean.com · checked against the official source on 2026-09-03

Open WebUI https://openwebui.com · checked against the official source on 2026-09-13

This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.