Open WebUI

Open WebUI is a self-hosted, open-source web UI for LLMs (notably Ollama and OpenAI-compatible backends). It exposes a REST API for chats, models, prompts, knowledge (RAG), users, and tools. Distributed under a modified BSD-3-Clause license; primarily run via Docker or pip on your own infrastructure.

Open WebUI publishes 4 APIs on the APIs.io network, including Anthropic API, Ollama API, Chat Completions API, and 1 more. Tagged areas include LLM, Open Source, Self-Hosted, Ollama, and Chat UI.

Open WebUI’s developer surface includes authentication, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

27.1/100 thin ▬ flat Agent 18/100 agent aware Front door AI 5/6 prominent Full breakdown ↓
scored 2026-10-04 · rubric v0.23.0

1 published contract

LLM Open Source Self-Hosted OllamaChat UIRAG

Kin Score

Kin Score How this is scored →
scored 2026-10-04 · rubric v0.23.0

Composite quality — 27.1/100 · thin

Contract Quality 8.0 / 19

Developer Ergonomics 6.1 / 15

Access Clarity 2.0 / 15

Operational Transparency 1.0 / 10

Contract Governance 0.0 / 9

Discoverability 4.3 / 8

Regulatory Posture 1.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 18/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/open-webui: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Interfaces this provider implements that became standards by being copied rather than ratified. Each is profiled by the API Commons, and the evidence column says how the claim was established — not that it was made.

The Anthropic Messages Dialect

declared — publishes a spec that declares them

2 core of 244 operations graded · api-commons/models

The OpenAI Interface

prose — states compatibility; nothing published to check it against

2 core of 338 operations graded · api-commons/models

APIs 4

Individual APIs this provider publishes, each with its own machine-readable definition.

Open WebUI API

REST API exposed by a self-hosted Open WebUI instance. Endpoints cover chat completions (proxying upstream backends like Ollama or OpenAI-compatible servers), models, prompts, k...

Open WebUI Anthropic API

The Anthropic API from Open WebUI — 1 operation(s) for anthropic.

Open WebUI Ollama API

The Ollama API from Open WebUI — 3 operation(s) for ollama.

Open WebUI Chat Completions API

The Chat Completions API from Open WebUI — 1 operation(s) for chat completions.

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Open WebUI Anthropic API

OPEN COLLECTION

Open WebUI Anthropic Chat API

OPEN COLLECTION

Open WebUI Anthropic Ollama API

OPEN COLLECTION

Open WebUI API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Open Webui Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Open Webui Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Open Webui Finops

FINOPS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Open Webui Authentication

http · 1 scheme

SECURITY

Open Webui Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Open Webui Agentic Access

5 operations · 4 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

OpenSource

OpenSource

Source (apis.yml)

aid: open-webui
url: https://raw.githubusercontent.com/api-evangelist/open-webui/refs/heads/main/apis.yml
name: Open WebUI
kind: company
description: Open WebUI is a self-hosted, open-source web UI for LLMs (notably Ollama and OpenAI-compatible backends). It
  exposes a REST API for chats, models, prompts, knowledge (RAG), users, and tools. Distributed under a modified BSD-3-Clause
  license; primarily run via Docker or pip on your own infrastructure.
deliveryModel:
  model: unknown
  license_evidence:
    repo: open-webui/open-webui
    spdx: NOASSERTION
    stars: 153135
  open_source: unknown
  commercial: true
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  - pricing
  - repository-unlicensed
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  try_now_blocked_by: loopback
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/open-webui.png
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- LLM
- Open Source
- Self-Hosted
- Ollama
- Chat UI
- RAG
tags_raw:
- LLM
- Open Source
- Self-Hosted
- Ollama
- Chat UI
- RAG
- Open-Source
created: '2026-05-08'
modified: '2026-05-08'
specificationVersion: '0.23'
apis:
- aid: open-webui:platform
  name: Open WebUI API
  description: REST API exposed by a self-hosted Open WebUI instance. Endpoints cover chat completions (proxying upstream
    backends like Ollama or OpenAI-compatible servers), models, prompts, knowledge bases, files, RAG, users, auth, and tools.
    Authentication uses the Open WebUI session token or per-user API keys. The base URL is wherever you deploy Open WebUI
    (commonly http://localhost:3000/api/v1).
  humanURL: https://docs.openwebui.com/getting-started/api-endpoints
  baseURL: http://localhost:3000/api/v1
  tags:
  - Chat
  - Models
  - Prompts
  - RAG
  - Knowledge
  - Tools
  properties:
  - type: Documentation
    url: https://docs.openwebui.com/
  - type: GitHub
    url: https://github.com/open-webui/open-webui
  - type: Reference
    url: https://docs.openwebui.com/getting-started/api-endpoints
- aid: open-webui:open-webui-anthropic-api
  name: Open WebUI Anthropic API
  description: The Anthropic API from Open WebUI — 1 operation(s) for anthropic.
  humanURL: https://docs.openwebui.com/getting-started/api-endpoints
  baseURL: http://localhost:3000/api/v1
  tags:
  - Anthropic
  properties:
  - type: OpenAPI
    url: openapi/open-webui-anthropic-api-openapi.yml
- aid: open-webui:open-webui-ollama-api
  name: Open WebUI Ollama API
  description: The Ollama API from Open WebUI — 3 operation(s) for ollama.
  humanURL: https://docs.openwebui.com/getting-started/api-endpoints
  baseURL: http://localhost:3000/api/v1
  tags:
  - Ollama
  properties:
  - type: OpenAPI
    url: openapi/open-webui-ollama-api-openapi.yml
- aid: open-webui:open-webui-chat-completions-api
  name: Open WebUI Chat Completions API
  description: The Chat Completions API from Open WebUI — 1 operation(s) for chat completions.
  humanURL: https://docs.openwebui.com/getting-started/api-endpoints
  baseURL: http://localhost:3000/api/v1
  tags:
  - Chat Completions
  properties:
  - type: OpenAPI
    url: openapi/open-webui-chat-completions-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/open-webui-agentic-access.yml
- type: DomainSecurity
  url: security/open-webui-domain-security.yml
- type: Authentication
  url: authentication/open-webui-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/open-webui
- type: Website
  url: https://openwebui.com/
- type: DeveloperPortal
  url: https://docs.openwebui.com/
- type: OpenSource
  url: https://github.com/open-webui/open-webui
- type: Plans
  url: plans/open-webui-plans-pricing.yml
- type: RateLimits
  url: rate-limits/open-webui-rate-limits.yml
- type: FinOps
  url: finops/open-webui-finops.yml
- url: https://openwebui.com/blog
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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