Team Communication

The default workplace chat. Slack Free is free forever with message & file history capped at 90 days (changed from the old 10k-message limit in Aug 2024), up to 10 app integrations, 5 GB total file storage, 1:1 and group audio/video huddles, and unlimited channels; paid Pro from ~$7/user/mo adds unlimited history, unlimited integrations, and Slack Connect.

Bandwidth

n/a

Requests

90-day message & file history, 10 integrations, 5 GB storage

Paid from

$7/mo

Built for communities but a capable team-chat tool. Discord Free is free forever with unlimited servers, channels, full message history (no time cap), voice & video calls, screen share up to 1080p@60fps, and 25 MB file uploads; Nitro (~$9.99/mo) adds HD streaming, 500 MB uploads, and custom emoji.

Bandwidth

n/a

Requests

Unlimited servers, channels, full message history, voice & video

Paid from

$10/mo

Open-source (AGPLv3) self-hostable Slack alternative. Free to self-host with unlimited teams, channels, full message history, file sharing, and integrations; Mattermost Cloud offers a free tier for small teams, and paid Professional from ~$10/user/mo adds enterprise compliance, SSO, and analytics.

Bandwidth

n/a

Requests

Self-host unlimited teams, channels, full message history

Paid from

$10/mo

An async-first team-chat tool from Doist (makers of Todoist) built around threaded conversations instead of real-time channels. Twist Free is free forever for teams of up to 5 members with 1 month of message history and 5 GB file storage; paid Unlimited from ~$6/user/mo adds unlimited members, full message history, and unlimited integrations.

Bandwidth

n/a

Requests

5 members, 1-month message history, 5 GB storage

Paid from

$6/mo