Is Hermes WebUI better than Open WebUI?

They serve different purposes. Hermes WebUI is a dedicated browser interface for Hermes Agent — if you're already using Hermes, it's the simplest way to chat from a browser. Open WebUI is a full-featured AI chat hub that connects to 15+ model backends including Hermes via its API. They're complementary: many users run Open WebUI for daily chat and Hermes WebUI for agent configuration.

Can I use both Hermes WebUI and Open WebUI together?

Yes. A common setup: Open WebUI on port 3000 as the daily chat interface (connecting to Hermes Agent via API at hermes-agent:8642/v1), and Hermes WebUI on port 8787 for session management, skill editing, and workspace browsing. They don't conflict and can share the same Hermes Agent backend.

Which uses fewer resources — Hermes WebUI or Open WebUI?

Hermes WebUI (single-container) is lighter — ~200MB RAM idle. Open WebUI needs ~500MB-1GB RAM for its Python backend, Svelte frontend, and optional RAG vector database. If you're on a 2GB VPS, Hermes WebUI fits comfortably alongside the agent. Open WebUI needs a 4GB+ instance.

COMPARISON

Hermes WebUI vs Open WebUI — Docker Deployment Comparison (2026)

Bottom line: Hermes WebUI is a dedicated browser interface for the 140K+ star Hermes Agent — deploy in 5 minutes, 3 container modes, built for agent management. Open WebUI is a multi-model chat hub supporting 15+ backends — deploy in 1 minute, richer features but heavier. If you're already using Hermes Agent, Hermes WebUI is the simpler, lighter choice. If you need one interface for Ollama, OpenAI, and Hermes together, Open WebUI wins. Many users run both.

Side-by-Side Comparison

Dimension	Hermes WebUI	Open WebUI
Purpose	Dedicated Hermes Agent browser UI	Universal AI chat platform (multi-model hub)
Model Backends	1 — Hermes Agent only	15+ — Ollama, OpenAI, Anthropic, Groq, LM Studio, and more
Deploy Time	~5 min (single-container)	~1 min (single docker run)
Container Modes	3 (single / dual / triple)	1 (monolith with optional GPU variant)
Idle RAM	~200 MB	~500 MB – 1 GB (with RAG)
RAG / Document Q&A	❌ (relies on Agent)	✅ Built-in — 9 vector DBs + doc parsers
Web Search Integration	❌ (via Agent tools)	✅ 15+ search engines built-in
Image Generation	❌	✅ DALL-E, Gemini, ComfyUI, A1111
GitHub Stars	~12.5K (webui repo) / 140K+ (agent)	~138K
Enterprise Auth	Basic password	✅ LDAP, SSO, OAuth, SCIM 2.0
PWA / Mobile	❌	✅ Native PWA with offline support

Docker Deployment: Code Comparison

Hermes WebUI — Single Container (5 min)

git clone https://github.com/nesquena/hermes-webui.git
cd hermes-webui
cp .env.docker.example .env   # set API keys + UID/GID
docker compose up -d
# Open http://localhost:8787

Open WebUI — Single Container (1 min)

docker run -d -p 3000:8080 \
  -v open-webui:/app/backend/data \
  --name open-webui \
  --restart always \
  ghcr.io/open-webui/open-webui:main
# Open http://localhost:3000

Open WebUI is faster to start because it bundles frontend and backend in one image. Hermes WebUI takes slightly longer because you need to clone the repo and set UID/GID — but these 2 extra steps prevent the #1 permission error that breaks multi-container setups.

Which One Should You Choose?

Choose Hermes WebUI when...

You're already using Hermes Agent and want a browser interface for session management, skill editing, and workspace browsing. You value a lightweight setup (200MB RAM) and need the CLI-equivalent experience in a browser. You want multi-container isolation for production — gateway, WebUI, and dashboard running independently.

Choose Open WebUI when...

You need one chat interface for multiple model providers (Ollama + OpenAI + Anthropic). You want built-in RAG for document Q&A, web search integration, or image generation. You need enterprise features like SSO/LDAP or a native mobile PWA. You're not tied to Hermes Agent specifically.

Use both together (recommended hybrid)

Run Hermes Agent as the backend, Hermes WebUI on port 8787 for agent management, and Open WebUI on port 3000 connected to Hermes via its OpenAI-compatible API at hermes-agent:8642/v1. This gives you Open WebUI's rich chat features with Hermes Agent's autonomous capabilities underneath. Open WebUI officially documents this setup.

Resource Requirements: What Fits Your VPS?

Setup	Min RAM	Idle RAM	Storage	VPS Tier
Hermes Agent + Hermes WebUI (single)	2 GB	~400 MB	~3 GB	2 GB / 1 vCPU
Hermes Agent + Open WebUI	4 GB	~800 MB – 1.2 GB	~5 GB	4 GB / 2 vCPU
All three (Agent + both UIs)	4 GB	~1 – 1.5 GB	~6 GB	4 GB / 2 vCPU

Measured on Hetzner CX22 (2 vCPU, 4 GB RAM, 40 GB SSD). All container images pre-pulled. Hermes Agent model download (if using local LLM) adds 4-8 GB — not counted here; this guide assumes API-based LLM usage (Anthropic / OpenAI / OpenRouter).

FAQ — Hermes WebUI vs Open WebUI

Is Hermes WebUI a replacement for Open WebUI?

No. Hermes WebUI is purpose-built for Hermes Agent management. Open WebUI is a general-purpose AI chat platform. They solve different problems and many users run both.

Can I connect Hermes Agent to Open WebUI?

Yes. Hermes Agent exposes an OpenAI-compatible API at port 8642. Point Open WebUI's OPENAI_API_BASE_URL to http://hermes-agent:8642/v1 and it works. This is the most common hybrid setup — Open WebUI for chat, Hermes Agent for autonomous task execution.

Which is better for a small VPS (2 GB RAM)?

Hermes WebUI. At ~200MB idle, it leaves room for the Hermes Agent process. Open WebUI's ~500MB – 1GB idle RAM would max out a 2GB instance when combined with the agent. If you're on a 2GB VPS, use Hermes WebUI single-container mode.

Do I lose anything by using both?

The only cost is extra RAM (~300MB for the second web UI container). If your VPS has 4GB+, there's no downside. The two UIs don't conflict — different ports, different volumes, shared Hermes Agent backend.

Which one gets updated more frequently?

Open WebUI releases more frequently (weekly cadence) with a larger contributor base. Hermes WebUI tracks Hermes Agent releases (roughly weekly in 2026). Both are actively maintained as of June 2026.

Next Steps

Deploy Hermes WebUI

Complete walkthrough with working compose files for all 3 container modes. → Full setup guide

Troubleshooting Handbook

8 real errors with verified fixes from GitHub issues. → Error catalog

Docker Compose Examples

Ready-to-run YAML files on GitHub — single, dual, and triple-container variants. → GitHub repo