Slack

What it is

Slack is a team messaging and collaboration platform that doubles as a place to build automations. Its home page says "By click or by code, Slack makes it easy for anyone to build time-saving automations of their own", and it frames the product as all your people and AI agents working together. For this directory the relevant part is Workflow Builder and the platform around it: a no-code way to turn routine processes into workflows, plus an API for teams that want to build their own apps and agents. The reader it fits is an operations, IT or team-lead audience whose people already spend the day in Slack and would rather automate where the conversation happens than switch to a separate tool. The pages do not say where the company is based.

What you build and how

Workflow Builder. This is the no-code path. The integrations page describes it as a way to turn routine processes into automated workflows, then add connectors to extend them to all your other tools. With plug-and-play connectors in Workflow Builder, the same page says you can create app automations that work right in Slack, with no coding necessary. Its example is a step that updates a Google Sheet or creates a record in Salesforce. The home page lists the kinds of process it has in mind: daily stand-ups, project updates and approvals. It also points to a library of templates for a first start, with a line about a project manager's block and a brief that has not begun, because "there's a template for that".

Apps from the Marketplace. The Slack Marketplace holds over 2,600 apps. To install one you find it in the Marketplace, click "Add to Slack" and follow the prompts, or open "Apps" in the left sidebar. The pages describe what apps do for everyday work: update file permissions, manage your calendar, approve requests, all from inside Slack. The home page names partners including Atlassian, Zoom, Google Drive, ChatGPT, Vercel, Box, Asana and Workday.

Custom apps and agents. For developers, the Slack API builds apps and agents that integrate your internal tools, processes and data. The company says more than 550K custom integrations are used daily. A feature called Add to Slack lets you instantly add agents from your favorite building platforms in a few clicks, with automated OAuth and zero-config setup. An MCP Registry connects tools to Slackbot using MCP servers for real-time access. The navigation also lists Slack Code for building with people and agents.

Slackbot and AI. Slackbot is described as a personal agent for work. The home page says it knows you and your team, and it coordinates work across your apps and agents so that one conversation gets work done. On the integrations page you can route requests to agents through Slackbot and have results delivered back. Admins can ask Slackbot for org-wide usage data rather than digging through dashboards, a feature the home page labels Slackbot Analytics. The company also lists native AI, Agentforce for teaming up with Salesforce agents, and AI-powered search across the company's files, decisions and conversations.

The collaboration layer around the automations. Channels are the base, described as flexible, transparent spaces for working with your team, AI assistants and agents. Huddles are a built-in video tool, and the home page says that with AI your meeting notes take themselves. Canvas is for creating, editing and sharing docs. Lists manage projects and tasks, so you can track, approve and mark items complete without leaving the conversation. Slack Connect lets you chat with clients and vendors in real time. Salesforce in Slack brings customer data next to conversations.

What the person on the receiving end sees is mostly a message. A request is raised in a channel, an approval arrives as a prompt, and a result is posted back. Slack is not a tool for building a public website, a store or a mobile app, and the pages do not present it as one.

What the pages say about plans and limits

The pages publish no plan prices. They point to a pricing page for the free and paid plans. What they do state is the app limit per plan: up to 3 apps on the free version of Slack, up to 10 on the Pro plan, and no limit on Business+. They add that some app services require payment or a subscription of their own before you use them in Slack, so an app's cost is separate from Slack's.

The home page makes two usage claims. It says AI in Slack gives users an average of 97 minutes a week in potential time savings, and that Slack users report a 35% increase in time saved due to automations. Both are the company's own figures. It also quotes Kate Jenson, Head of Americas at Anthropic, who says Slack "has been essential to our growth, our speed, and our ability to stay aligned as we scale".

On data, the integrations page states: "Slack never shares your data with AI models for training. AI only works with the messages you already have access to, and it all runs safely within Slack's systems." It also says a company can control its own encryption keys. The pages name no certifications, so a compliance review would need to ask the company directly.

A third-party example shows what the Marketplace holds. Approveit, Inc., a company headquartered in the United States, lists a Slack-native approval workflow app. Its own listing describes a no-code workflow builder with ready-made templates, an AI assistant, and approvals such as invoices, purchase orders, expenses, contracts and time-off requests. Those features belong to Approveit, not to Slack. The listing also states that Slack has no business associate agreement with any third-party app provider, so the buyer is responsible for validating an app's compliance.

Who it suits and who it does not

Slack suits a team whose work already runs through Slack and whose routine tasks, such as approvals, stand-ups and status updates, can live in a channel. Marketing, finance, HR and IT teams can set up a workflow without a developer, and an engineer can go further with the API when the no-code path runs out. The Marketplace's 2,600+ apps mean many common tools are one install away.

It suits less well a team that wants a standalone automation engine with no chat layer. Workflow Builder lives inside Slack, so a person who is not in your workspace is outside the flow, unless you use Slack Connect with clients and vendors. The app limits also matter on the free plan, where 3 apps will be tight for anyone planning to connect a long list of tools. And because the pages publish no prices, you have to check the pricing page before costing a rollout for a large team.