1
Also covers ai chat and self hosted · open source · free
Odysseus provides a self hosted AI workspace with chat, agents, tools, model serving, email, and research.
Alternatives
The Best Onyx Alternatives in 2026
24 alternatives3 free · 11 open source
Looking for something like Onyx? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 3 are free or have a free plan and 11 are open source.
Onyx provides open-source AI chat that can work with different language models.
Top picks at a glance
First suggestionOdysseusOdysseus provides a self hosted AI workspace with chat…Another optionEnclaveEnclave explores a virtual world for AI companionship and…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | Odysseus | Free | Yes | Web |
| 2 | Enclave | — | Yes | — |
| 3 | Silly Tavern | — | Yes | — |
| 4 | Source code | — | Yes | — |
| 5 | ChatGPT-Next-Web | — | Yes | Android, iOS, Linux |
| 6 | Chatbox | — | Not stated | Android, iOS, Web |
| 7 | Gpt4all | — | Yes | Linux, macOS, Windows |
| 8 | Urv AI Chat | — | Not stated | Web |
| 9 | Microsoft Copilot | — | Not stated | Web |
| 10 | ChatHelp.ai | — | Not stated | Web |
All Onyx alternatives
2
Also covers ai chat and self hosted · same kind of open-source project · open source
Enclave explores a virtual world for AI companionship and social interaction.
3
Also covers ai chat · same kind of open-source project · open source
SillyTavern is a frontend for users working with large language models.
4
Also covers ai chat · same kind of open-source project · open source
chatbot-ui provides an AI chat interface for working with different models.
5
Also covers ai chat · same kind of open-source project · open source
NextChat is an AI chat assistant client that supports named language models and is available on web and several desktop and mobile platforms.
6
Chatbox
chatboxai.appAlso covers ai chat
Chatbox brings several AI models into one app for chat and work using user supplied API keys.
7
Also covers ai chat · same kind of open-source project · open source
GPT4All runs language models locally on a range of devices through open-source software.
8
Urv AI Chat
perchance.org/urv-ai-chatAlso covers ai chat
URV AI offers chat with language models, character creation, and image generation.
9
Also covers ai chat
Microsoft Copilot provides AI chat for answering questions, writing, image creation, work tasks, and coding.
10
ChatHelp.ai
chathelp.aiAlso covers ai chat
ChatHelp.ai offers a business, work, and study assistant, a website chat widget, and curated AI tools and agents.
11
Merlin
getmerlin.inAlso covers ai chat
Merlin offers an AI chat interface for accessing models such as ChatGPT and Gemini to research, write, code, and create images.
12
4thWall AI
beta.4wall.aiAlso covers ai chat
4thWall AI provides an interactive chat platform for conversations with AI characters.
13
Mendable
mendable.aiAlso covers ai chat
Mendable helps developers build AI chat applications by ingesting technical content and deploying answers with a line of code.
14
ChatPDF
chatpdf.comAlso covers ai chat
ChatPDF brings ChatGPT-style intelligence and PDF AI technology together for smarter document understanding. Summarize, chat, and analyze.
15
ChatSonic
writesonic.com/chatAlso covers ai chat
ChatSonic combines AI chat with marketing workflows, research, and connected tools.
16
Thena
thena.aiAlso covers ai chat
Thena provides customer-support ticketing and AI chat for B2B teams across Slack, email, and web chat.
17
PyGPT
pygpt.netAlso covers ai chat
PyGPT provides an open-source desktop AI assistant for chat, agent building, and retrieval-augmented knowledge access.
18
Also covers ai chat · free
Woozlit offers free AI chat and image generation tools through its online service.
19
Also covers self hosted · same kind of open-source project · open source
AnythingLLM is a local-first platform for using AI agents and language models in a self-managed workspace.
20
Open Webui
github.com/open-webui/open-webuiAlso covers self hosted · same kind of open-source project
Open WebUI provides an interface for using AI models, including Ollama and the OpenAI API.
21
Also covers self hosted · same kind of open-source project · open source
Jan runs an offline AI chat assistant on a personal computer as an open-source ChatGPT alternative.
22
Also covers self hosted · open source
Open WebUI provides a self hosted platform for connecting AI models and extending the interface with code.
23
Also covers self hosted · same kind of open-source project · open source · free
Build personal AI agents with nanobot, a self-hosted Python framework that includes web UI, tools, memory, and integrations.
24
Also covers self hosted · same kind of open-source project · open source
Ask Vane questions and get responses through its artificial intelligence answering engine.
No alternatives match this filter.
Alternatives to similar tools
Microsoft Copilot24 alternativesOpen Webui24 alternativesSource code24 alternativesChatGPT-Next-Web24 alternativesAnything Llm24 alternativesChatbox24 alternatives
What is the best alternative to Onyx?
Based on features, tags and platforms, the closest alternatives to Onyx are Odysseus, Enclave, and Silly Tavern.
Is there a free alternative to Onyx?
Yes. Odysseus, Woozlit, and nanobot are free or offer a free plan.
Are there open-source alternatives to Onyx?
Yes: Odysseus, Enclave, Silly Tavern, and Source code.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative