> DeepSeek makes open-source AI models, a free chat app and an API that coding agents use. See where Revdoku mailboxes fit.

# DeepSeek: Chat App, API and Email for Agents

[DeepSeek](https://www.deepseek.com/en) builds open-source AI models and a free chat app. DeepSeek describes itself like this:

> DeepSeek is an AI research company focused on building world-leading general artificial intelligence.

## At a glance

| | DeepSeek |
|---|---|
| **Made by** | DeepSeek, which open-sources models such as DeepSeek-V4 and DeepSeek-R1 |
| **Chat app** | Free AI assistant with DeepThink and Search modes ([download](https://www.deepseek.com/en/download/)) |
| **API** | OpenAI- and Anthropic-compatible format with tool calls, and guides for Claude Code, Codex, OpenCode and other agents ([docs](https://api-docs.deepseek.com/quick_start/agent_integrations/claude_code)) |
| **MCP** | The API ignores MCP server settings ([docs](https://api-docs.deepseek.com/guides/anthropic_api)); DeepSeek Harness, in public preview, connects to MCP servers with custom headers |
| **Free to try** | Free chat app; the API is billed per token |

## Using Revdoku with DeepSeek

DeepSeek's docs show how to run DeepSeek models in coding agents such as [Claude Code](/claude-code/), Codex and [OpenCode](/opencode/). Add Revdoku to that agent as an MCP server at `https://mcp.revdoku.com`, and the agent can read email and attachments in your Revdoku mailboxes while it runs on DeepSeek models. Once MCP servers with OAuth sign-in become available in DeepSeek's own apps, you can use Revdoku with DeepSeek directly.

[More AI agent platforms and how they handle email](/platforms/)

Email address
for your AI agent

youragent@yourdomain.com address
to receive emails, send replies
and store attachments and files.

Built-in virus, malware and spam filter

Built-in AI screening against prompt injection

Built-in secure file storage

Read, send, manage via API, MCP, CLI

Create mailbox
From $4.99/mo · 30-day money-back guarantee

or Try free : 1 mailbox, replies only to you, no card

## Frequently Asked Questions

### What is DeepSeek?

DeepSeek is an AI research company that builds and open-sources large language models. It offers a free chat app and an API in the OpenAI and Anthropic formats.

### Can DeepSeek models run in coding agents?

Yes. DeepSeek's docs include guides for Claude Code, Codex, OpenCode and other agents, using its Anthropic- or OpenAI-compatible API.

### Can DeepSeek use a Revdoku mailbox?

Through an agent. Run DeepSeek models in an agent such as Claude Code or OpenCode and add Revdoku there as an MCP server. Once MCP servers with OAuth sign-in become available in DeepSeek's own apps, you can use Revdoku with DeepSeek directly.

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