Slack is a platform, not a feature list.

Replaceable in parts: channel messaging, lists and workflows can be built, but the hosted network, 2,600-app ecosystem, Slack Connect and AI/CRM infrastructure cannot.

Channels and messaging

• Channels
  Create and join channels for teams, projects or topics, with searchable history.
• Threads and file sharing
  Reply in threads and share files within conversations.
• Slack Connect external channels
  Message partners and clients in shared channels across organisations.
  We can't build this. Requires the other organisations' workspaces on a shared network; only one side can be built.

Huddles and video

• Huddles
  Start quick audio or video calls with channel members.
  Needs an outside service: Daily. Needs a video-calls provider; browser-based calls possible but no network infrastructure of our own.
• Automatic huddle notes
  AI-generated meeting notes from huddles.
  Needs an outside service: Deepgram + OpenAI or Anthropic API + Daily. Needs transcription and AI model services; quality depends on those.

Canvas and Lists

• Canvas docs
  Create, edit and share rich documents in channels.
  Simplified version. Simpler rich-text docs only; no full Google-Docs-level editing.
• Lists
  Track projects, tasks and records in tables with statuses.

Workflows and automation

• Workflow Builder
  Build automated workflows triggered by events or forms.
• Approvals and reminders
  Route approvals and send reminders.
  Needs an outside service: Resend. Email notifications need a transactional email service.

Integrations and apps

• Apps marketplace (2,600+ apps)
  Install third-party apps such as Asana, Google Drive, Jira.
  We can't build this. The third-party app ecosystem belongs to other vendors; we cannot build it.
• Custom API integrations
  Connect internal tools and data sources through APIs and webhooks.

AI features

• Channel and thread summaries
  Summarise long channels and threads.
  Needs an outside service: OpenAI or Anthropic API. Needs an AI model provider; no custom-trained models.
• Enterprise search
  Search messages, files and connected apps from one bar.
  Simplified version. Keyword search over our own data is buildable; cross-app AI search is not.
• Slackbot AI agent
  Personal AI assistant that knows your company.
  Needs an outside service: OpenAI or Anthropic API. Basic assistant via third-party model; no proprietary model training.

Security and administration

• Roles and permissions
  Granular admin controls per user.
• Single sign-on
  Enterprise SSO login.
  Needs an outside service: WorkOS. Needs an SSO provider; compliance certifications like SOC 2 cannot be obtained by us.
• Enterprise Key Management
  Customer-controlled encryption keys.
  We can't build this. Requires enterprise-grade infrastructure and certifications we cannot provide.

CRM and sales

• Slack CRM contacts and deals
  Capture contacts and track deals from conversations.

What you’d bring

We write all the code. These features only work on outside services, and those accounts are yours to open and pay for directly.

What we can’t build

• Slack Connect external channels. Requires the other organisations' workspaces on a shared network; only one side can be built.
• Apps marketplace (2,600+ apps). The third-party app ecosystem belongs to other vendors; we cannot build it.
• Enterprise Key Management. Requires enterprise-grade infrastructure and certifications we cannot provide.

Build only the Slack features you use

Pick your features, choose what it connects to, and see the price before you start.