Is Slack safe with your data?

Slack

Salesforce (Slack Technologies)

56/100

Partial disclosure · high confidence

Slack earns a C (56/100) because it discloses its data practices only in part.

#52

of 216 apps ranked

score · Meeting intelligence avg 52

vs category average

Grade scaleA · 70–100B · 60–69C · 48–59D · 35–47F · 0–34

Slack states plainly that customer messages and files are not used to train large language models and gives a working opt-out address for its global models, but the privacy policy names no retention period, no breach notification commitment, and no specific security controls.

What Slack's privacy policy and terms of service say about your data

No training on your messages

The policy states that Customer Data in Slack, including messages and files, is not used to train large language models, and that training on customer data would require affirmative opt-in consent.

Opt-out is a manual email

Excluding a workspace from Slack global models requires an Org or Workspace Owner to email the Customer Experience team with the workspace URL and a set subject line, rather than a self-serve setting.

Retention is open-ended

Slack says it keeps information for as long as necessary for the purposes in the policy, and may keep it after an account is deactivated, without naming any number of days.

Ad sharing continues despite no-sale pledge

Slack says it does not sell personal information, while also stating it may share identifiers and internet activity information with third-party advertisers to target ads on non-Slack sites.

What the policy is silent or vague on

Not stated: a deletion timeline after closure or request
Not stated: shorter retention for AI conversation logs
Not stated: marking of AI-generated output
Not stated: breach notification

Slack privacy rating

Training-data use2 of 4 disclosed

Keeps user inputs out of model training, or makes training opt-inDisclosed

Names a way to opt out of or into trainingDisclosed

Says whether training use differs by plan or tierPartial

Lets the user keep ownership of generated outputsPartial

Data-subject rights0 of 5 disclosed

Grants a right to access your dataPartial

Grants a right to delete your dataPartial

Offers data portability in a usable formatPartial

Grants a right to correct your dataPartial

Grants a way to object to or opt out of processingPartial

Retention and deletion0 of 4 disclosed

States a retention period for your dataPartial

States a deletion timeline after closure or requestSilent

Sets a shorter retention for AI conversation logsSilent

Commits to collecting only the data it needsPartial

Third-party sharing3 of 5 disclosed

Lists the categories of third parties it shares withDisclosed

References a sub-processor list or data processing agreementDisclosed

Does not sell or share data for advertising, or offers opt-outPartial

Names a safeguard for international data transfersDisclosed

States a standard for government and law-enforcement accessPartial

Transparency2 of 5 disclosed

Discloses that you are interacting with AIDisclosed

Marks AI-generated or synthetic outputSilent

Enumerates the categories of data it collectsDisclosed

Maps processing purposes to legal basesPartial

Is versioned and dated, with change noticePartial

Sensitive data and children0 of 2 disclosed

Discloses automated decisions and a human-review pathNot applicable

Limits the use of special-category dataPartial

Governs biometric data specificallyNot applicable

States protections for children's dataPartial

Security and accountability1 of 3 disclosed

Describes its security safeguardsPartial

Commits to breach notificationSilent

Names a certification or a privacy contactDisclosed

DisclosedPartialSilentAdverseNot applicable

Details

Category: Meeting intelligence
Modalities: text, audio
Processes biometrics: No
Policy last updated: 2023-07-05
Region scored: Global / US-default
Last assessed: 2026-10-13

Documents examined

Other meeting intelligence apps

Each grade reflects our analysis of what an app states in its public privacy policy and terms as of the assessment date. It measures the transparency of those documents, not the company's actual data practices, security, or compliance. Grades are our opinion, offered for general information. Full disclaimer.