Slack

Slack's listing is written for companies rather than for people, and it says so in the first line: it is a product for turning "chaos into cohesive collaboration". What makes it unusual among the four reviewed here is that it marks its own paid boundaries — two footnotes flag which features need an upgrade to Slack Pro, Business+ or Enterprise, and which need the Slack AI add-on. It is the only one of the four with no consumer proposition at all: no strangers, no public communities, no personal use case.

Work is organised into a channel for every project, with your team, customers, contractors and vendors in the same place, and video chat and screen sharing happen inside Slack rather than in a separate app. Beyond text there are audio and video clips to record and send, shared documents that sit next to the conversation, and project management tools for tracking to-dos, assigning tasks and mapping out milestones. The integration list is the other half of the pitch: 2,600+ apps including Google Drive, Salesforce Data Cloud, Dropbox, Asana, Zapier, Figma and Zendesk, reachable without leaving Slack.

This is the only listing of the four that tells you where the free version stops, and it does it with footnotes rather than a pricing page: templates and project management tools require an upgrade to Slack Pro, Business+ or Enterprise. AI-powered search and the AI meeting notes require the Slack AI add-on, marked with a second footnote. Everything else described — channels, video chat, screen sharing, clips, shared documents and the app directory — is presented as part of the product with no marker at all, so a reader can see the two boundaries the company chose to draw and none of the ones it did not.

This is the one listing of the four with nothing at all to say about encryption, and the omission is less alarming here than it would be elsewhere, because nothing in the description is aimed at private conversation with strangers. It is a workplace tool, and its security story lives in an administrator's console rather than in a store listing: the listing mentions approving requests and updating file permissions, which are controls a company sets rather than protections an individual chooses. What the listing does not describe is who can see what inside a workspace, how long messages are kept, or what an employer can read — and those are the questions that matter to somebody using it at work. The feature list is impressive and the privacy description is absent, and for this product those two facts are consistent rather than contradictory: the buyer is the company, not the person typing.

Teams and companies that want channels, integrations and video in one place, and who have somebody whose job includes administering it. It is not a way to meet people and it is not a private messenger, so anyone looking for either should be in a different part of this directory.

The clearest commercial disclosure of the four and the least relevant to anyone outside a workplace: it names exactly which features sit behind an upgrade and which behind an add-on, and says nothing about encryption at all. The 2,600+ integrations and the document and project features are the real product, and they are described concretely rather than in adjectives. The question a reader brings to a messaging app — who can see this — is answered nowhere, because the listing was written for the person buying it for a team rather than the person typing in it.