Review date: 09/08/2021

Not gonna lie, Slack is a handy tool in our brave, new remote work world. The workplace workhorse keeps us all connected with pings, dings, and channels for everything from work to random distractions that make the day bearable. And it’s not just for work. A number of communities have set up Slack groups to help connect people interested in activism or issues. While Slack is mostly known for its IRC-like messaging features (remember IRC?...ah, memories), it does have built-in video and phone call features too (they've been around since 2016). Since the pandemic drove so many to remote work, it's become a real concern and possibility bosses can track all those thoughts, venting backchannels , and potentially video chats with co-workers too.

What could happen if something goes wrong

There are some privacy and security concerns users should be aware of with Slack, although for the most part, Slack users are going to have to go with the rules of their workplace and trust their company to set up protections and privacy policies. One big concern we have about Slack is they have no features that allow users to block or hide abusive or unwanted messages. In the battle between Slack and Microsoft Teams to be the workplace tool of choice, Teams does have features that allow users to block and hide users, if only in personal Teams instances. Slack forces you to see the abuse and then mute it whereas with Teams you can block an abuser before they can send you abusive messages. This is definitely a win for Microsoft Teams over Slack. And, as with any workplace tool, please never assume anything you say is private. Many Slack versions allow the owner to monitor all chats, public and private. What could happen if something goes wrong? Well, you could message your co-worker about how annoying your boss is because they always come to meetings with Dorito dust on their face. Your boss could be monitoring your private chats, and boom, you’re fired! Best to keep those private vent sessions with your co-workers off Slack, off your work computer, and only on a private messaging app like Signal.


Can it snoop on me?


Device: N/A

App: Yes


Device: N/A

App: Yes

Tracks Location

Device: N/A

App: Yes

What is required to sign up?

What data does it collect?

What is the company’s known track record for protecting users’ data?


In 2015, Slack got hacked. Hackers were able to get into Slack’s central user database, which included usernames, email addresses, encrypted passwords, and any personal data users chose to add to their account, like phone numbers, Skype IDs, etc. Slack added a two-factor authentication as an extra security measure after the 2015 hack. In 2019 Slack said that some log-in credentials may have been compromised, and blamed the 2015 hack for it. So, they changed passwords for approximately 1% of users who were active before 2015 and have not changed passwords ever since. Slack also was criticized for leaving metadata including accurate location (GPS) in files uploaded to the platform. After May 2020, Slack began stripping uploaded images data of its metadata, including GPS coordinates (accurate location).

Can this product be used offline?

Not applicable

User friendly privacy information?


Privacy policy is written in legalese, and sometimes forwards to contact Customer Support for more detail. For example, a clause on data retention: "The deletion of Customer Data and other use of the Services by Customer may result in the deletion and/or de-identification of certain associated Other Information. For more detail, please review the Help Center or contact Customer (sic)."

Links to privacy information


Does this product meet our Minimum Security Standards?




Slack does not offer end-to-end encryption by default. It relies on encryption in transit and at rest. Users can add an end-to-end encryption messaging feature with third-party extensions.

Strong password


A strong password is required to login into Slack. You can also turn on a feature for a mobile passcode in the enterprise version.

Security updates


Slack details its security updates in its blog.

Manages vulnerabilities


Slack operates a security bug bounty program.

Privacy policy


Artificial Intelligence

Does the product use AI?


Does the AI use your personal data to make decisions about you?

Can’t Determine

Does the company allow users to see how the AI works?


Slack's AI blogs provide a decent overview with notes how they fight against biases. Good work Slack! Slack uses machine learning to analyze some of the data submitted to the service in order to provide search or recommendation features, among others. Additionally, they use machine learning for detecting and preventing spam.


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