DeepSeek vs Onyx
DeepSeek
chat.deepseek.comOnyx
onyx.appSide by side
| Figure | DeepSeek | Onyx |
|---|---|---|
| Price from | Free | $20/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | — | Yes |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 3 | 3 |
| Spec score · AI chatbots and assistants | 8.7 (#17) | 9.0 (#12) |
| Desktop platforms | The official download page lists Harness downloads for macOS (Apple silicon, macOS 13 or later) and Windows. | The native desktop app is available for Windows, macOS, and Linux and connects to an existing Onyx deployment. |
| File uploads | Yes | Yes |
| Free plan | Yes | Yes |
| App integrations | Yes | The product advertises more than 50 synced connectors and names Slack, Google Drive, Confluence, Salesforce, GitHub and Jira among supported sources. |
| Support | DeepSeek lists [email protected] on its official site and [email protected] for privacy questions and requests. | The Business plan includes Community Support; Enterprise lists Dedicated Support and an Enterprise SLA. |
| Web search | Yes | Yes |
Plans
In their own words
DeepSeek
DeepSeek is an AI assistant for chatting with AI models, available on the web and through official iOS and Android apps. The free plan is listed at free and includes the assistant and official mobile apps. DeepSeek also offers an API, with deepseek-flash identified as the model name to use; legacy deepseek-v4-flash names route to V4.1-Flash. The API follows a format compatible with OpenAI and Anthropic APIs, and their SDKs can be used by changing configuration. It supports external tool calls, with a strict mode that checks tool schemas against supported JSON Schema specifications. DeepSeek says V4.1-Flash is live on the API with native multimodal support. Its desktop Harness can work in the background, edit local files, and handle long, complex tasks; downloads are listed for macOS (Apple silicon, macOS 13 or later) and Windows. DeepSeek is headquartered in Hangzhou, China. Its privacy policy says personal data is processed and stored in China, and advises users not to submit sensitive personal data.
Onyx
Onyx connects enterprise knowledge so people and AI agents can use relevant context in answers. It searches indexed sources in parallel and presents documents while enforcing each source's permissions. More than 50 connectors sync connected tools in the background and support hybrid semantic and keyword search. The Business plan lists chat and search, major LLM access, custom agents, MCP/OpenAPI actions, web search, deep research, code interpreter, and image generation. Business costs $20 a month, billed annually at $20 per user per month, for teams of any size, with 40+ app connectors and Community Support. Onyx provides APIs for messages, agents, LLM management, actions, and user authentication. Slack integrations can provide responses and agents; Microsoft Teams and Zendesk are described as coming soon. Deployments can run in a customer's cloud or on bare metal, including on-premise and fully air-gapped environments. The site says documents and embeddings can remain in customer infrastructure, data is not used for training, and permissions are checked at query time. Native Windows, macOS, and Linux apps connect to an existing deployment.