Slack is currently in a limited preview release. You can sign up for a free preview at the Slack website.
Early next year, wider availability will launch with new pricing. The Lite subscription level (free) will keep a limited searchable archive, restrict integrations to a total of five, and cap total storage at 5GB. The Standard ($9/user/month) will keep a full archive; remove restrictions on integrations; and allow 10GB per user, shared across the entire team. The Plus level ($19/user/month) includes the benefits of the Standard level, with storage doubled to 20GB per user. An Enterprise level ($49-99/user/month) will appear in late 2014. All subscription levels include free native apps for Android, iOS, Mac, and PC.
Team communication can be a tense, tangled snarl of inefficiency. The more I use Tiny Speck's team communication tool, the more my shoulders relax. Maybe that's why they call it Slack.
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