# Open WebUI vs Ollama: an open-source runner and a chat front end

> Ollama runs the models and Open WebUI is the chat front end over them, so the two are layers rather than rivals. When the work has to run, a team needs something more: Kortix, the open-source AI Operating System, runs the agents and lands finished work as a change request you review.

URL: https://openwebuialternative.com/open-web-ui-vs-ollama

## Ollama, Open WebUI and Kortix at a glance

Ollama is the model runner, Open WebUI is the chat front end, and Kortix is the open-source system that runs the agents.

| | Kortix (recommended) | Ollama | Open WebUI |
| --- | --- | --- | --- |
| What it is | The open-source AI Operating System, built for agent work | A runner that serves open models locally or in its cloud | A self-hosted chat interface over your models and documents |
| Open source | Yes, read it, fork it, audit it | Yes | Yes |
| The layer it fills | Agents, memory and connectors in one git repo you own | The model server, with a local REST API | The chat front end, with plugins, retrieval and web search |
| Where it runs | Kortix Cloud, your VPC, or your own on-prem network | Your own computer, or Ollama's cloud | Your own server, or its desktop app |
| Who it serves | People and agents, with roles and an audit trail | A developer running models on that machine | Multi-user accounts on one shared deployment |
| Does the work run | Agents take real actions and land a change request you review | It answers the model calls your app sends it | Chat turns, plus Open Terminal for execution |
| Where the setup lives | Files in a git repo you own, diffable like code | A local install and downloaded model weights | Admin settings and environment variables on the server |
| Model sources | Any model provider with your own keys | Open models from its library, local or cloud | Ollama, OpenAI-compatible APIs, and more |

The Ollama and Open WebUI columns reflect their own pages, checked October 2026.

## What the repo holds when the work has to run

`kortix.yaml`

```yaml
# kortix.yaml
agents:
  support-triage:
    file: agents/support-triage.md   # what it does, in plain markdown
    connectors: all                  # what it may reach
triggers:
  - slug: daily-digest
    type: cron
    cron: '0 0 9 * * 1-5'
```

Source: https://github.com/kortix-ai/suna

Agents and triggers live as files in the repo a team owns, where a chat app keeps its settings inside the app.

## Where a model runner stops and a chat UI starts

Ollama and Open WebUI sit at two different layers, and they are compared because they are installed together. Ollama is a model runner: it serves open models on your own computer or in Ollama's cloud, and it exposes a local REST API that other programs call ([Ollama's download page](https://ollama.com/download)). Open WebUI is a self-hosted chat front end: it connects to Ollama and to any OpenAI-compatible API, and puts a multi-user chat window, document retrieval, web search and plugins over them ([Open WebUI's docs](https://docs.openwebui.com)). One runs the model; the other is where a person types.

[Ollama's repository](https://github.com/ollama/ollama) lists Open WebUI among the interfaces built on top of it, which is the clearest sign that one is built on the other. If a script needs a model endpoint, Ollama alone is enough. If a team needs a shared window with accounts and history, Open WebUI is the layer that adds it.

## What each layer gives a team

Ollama runs open models in two ways, from [its download page](https://ollama.com/download): locally on the computer, where speed depends on the hardware, or in Ollama's cloud, where models run on its servers and need no download. It also ships a REST API and Python and JavaScript clients, so an application can call a model with no chat UI involved at all. Ollama's homepage reports 9M+ installs a month and 1B+ model downloads (checked October 2026).

[Open WebUI's docs](https://docs.openwebui.com) describe it as a self-hosted platform built to run entirely offline, with support for Ollama and OpenAI-compatible APIs. It adds a provider-agnostic interface, per-user accounts, retrieval over your own files, and a plugin and tool system. Recent work moved it toward execution: Open Terminal gives an agent a terminal and filesystem inside the chat, and Terminals gives each user an isolated environment on a team deployment.

## Where a team outgrows both

Both tools center the interface. A person drives each turn, and the output is an answer or an artifact inside the conversation. When the work has to change a real system, two questions decide the tool: which machine runs it, and who approves the result.

Kortix answers both. Your agents, skills, company memory and every connector live in one git repo you own. Each session runs on its own cloud computer and its own branch, an agent takes real actions in your tools, and the work reaches `main` through a change request a person reads first ([Kortix docs](https://kortix.com/docs)). That is the layer neither Ollama nor Open WebUI fills, because a model runner and a chat UI have no change-request step.

## Choosing between them

Pick Ollama alone when a script or an app needs a model endpoint, local or in Ollama's cloud, with no team interface. Pick Open WebUI when a team wants a self-hosted chat and document window over local and API models, with plugins and accounts. Pick Kortix when the output has to be finished work: agents that use your tools, return deliverables you keep, and land each change for review on the infrastructure you choose.

Ollama and Open WebUI stay useful beside it. Kortix works with any model provider with your own keys, so a team can keep the runner it already has. What changes is where the work lands: agents, memory and connectors in one repo the team owns.

## Questions about Open WebUI and Ollama

### Do I need Open WebUI to use Ollama?

No. Ollama is a model runner with a REST API, so a script or an application can call it directly. Open WebUI adds the chat window, accounts, document retrieval and plugins on top. Add it when a person, rather than a program, needs to talk to the model.

### Are Open WebUI and Ollama competitors?

They are not. Ollama serves the models and Open WebUI is one of the front ends built on it. The real choice is between calling a model from code and giving a team a shared chat interface.

### Can a team run both in production?

Yes. Ollama runs on a machine with a GPU and Open WebUI deploys on a server that points at it, a setup Open WebUI's docs support for offline and local use. The team still owns a deployment and its data store, and keeps them running.

### When is a chat front end not enough?

When the output has to change a real system. A chat turn ends at the reply. Kortix runs agents on their own cloud computers, lets them act in your tools, and lands each change as a request a person reads before it merges.

## Run your whole company from one repo you own.

Start with one job and grow from there.

[Try Kortix](https://kortix.com) · [Kortix vs Open WebUI](https://openwebuialternative.com/kortix-vs-open-webui)