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SecondChat · Chat App

SecondChat is the chat app of SecondStack — the user-facing workspace: a single chat interface that spans every model your organization enables. It combines multi-model chat, image generation, voice input, file and image attachments, retrieval over your own documents, and an agentic mode — without sending data to a third-party SaaS.

Agents
Chat Models
Image Generation

The model picker groups options by capability — agents, chat models, and image generation — across providers.

Multi-model from one interface

Section titled “Multi-model from one interface”

Users switch between providers in a single picker instead of juggling separate tools:

  • Chat models — Anthropic Claude, OpenAI GPT-5 family, and Google Gemini are available out of the box.
  • Image generation — generate and edit images with dedicated image models in the same workspace. See Image Generation.
  • Local models — self-hosted open-weight models are supported through vLLM when you run your own GPU inference (enabled by configuration).

Administrators group models by capability and enable or restrict them per team, so each group only sees the models it is allowed to use. See SecondGate for how access control works.

Beyond plain chat

Section titled “Beyond plain chat”
  • File attachments and vision — upload documents and images; the platform extracts and reads their content so models can answer over them.
  • Voice input — dictate prompts with push-to-talk speech-to-text.
  • Knowledge Collections — attach named document sets to any chat for retrieval-augmented answers. See Knowledge Collections.
  • Custom Prompts — save frequently used prompts as / slash commands with fillable variables. See Custom Prompts.
  • MCP tools — let chats reach into internal systems and APIs through Model Context Protocol tools, scoped to a user, team, or the whole organization.
  • SecondAgent mode — turn any chat into an agentic session that runs Claude Code in a sandboxed container. See SecondAgent.

Built for teams

Section titled “Built for teams”
  • Projects group related chats with shared instructions, knowledge, memories, and team access, so a new chat starts with the context already in place. See Projects.
  • System prompts and personas standardize how the AI behaves for specific workflows, without locking individuals out of free-form use.
  • Shareable chat templates let teams reuse proven setups.
  • Temporary chats keep sensitive conversations out of history when needed.
  • Thread forking and full-text search make long-running work easy to branch and find.
  • SecondChat installs as a progressive web app (PWA) for a native-like experience on desktop and mobile.
Section titled “Related”