Right on the heels of Facebook’s enterprise social network pilot launch, Slack is announcing a new way to pay for its platform.

The new option, called Slack Plus, will cost $12.50 per month, per user. Prior to this rollout, Slack had a free version, which included access to 10,000 searchable messages, and an unlimited messaging option for $6.67.

Slack Plus offers all the features of the $6.67 tier “plus” some extras. The new version integrates with single sign-on providers like OneLogin, Okta, Bitium, and some custom solutions, enabling a more secure login process. Slack tells me this is so that larger companies with strict authentication requirements can also use Slack.

The move to incorporate higher security features could also be an attempt to clear up any perceptions people have around Slack’s general security. Last fall, someone discovered Slack had a feature that revealed the internal names of staff members, inciting questions about the company’s privacy measures.

In addition to the single sing-on, Slack Plus also has the ability to export compliance reports, which we reported on late last year and are essentially a history of messaging activity.

The company is expected to roll out an enterprise-level version later this year, with pricing ranging from $49-$99 per person, per month.

Slack raised $120 million from Google Ventures and Kleiner Perkins in November and currently has 365,000 monthly active users.

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