Combine that with the IRC-like design philosophy, and you can see why Slack is getting so much attention. It's perfectly catered toward people already inclined towards bleeding-edge collaboration tools — basically, techies and the tech-adjacent. Not only is it unlikely to kill e-mail anytime soon, it's unlikely to extend outside the IT organization, at least for a while.
Second, that impressive revenue figure comes from somewhere. Slack's free version is little more than a trial, offering a mere 10,000 searchable messages and 5 external integrations. If you get hooked from that little taste, plans start at $6.97 per user per month, paid annually, which gets you unlimited archival searching, unlimited integrations, and tighter IT metrics and controls. Depending on your needs, that can go all the way up to $12.50/user/month for even deeper controls, priority support, and a bunch of other promised perks.
The bottom line here is that Slack is a very cool, very powerful, very handy chat tool that makes collaboration really easy and simple across platforms and services. But as ever, let the buyer beware — it's a better mousetrap, but your users may just not be mice. Not that there's anything wrong with that.
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