Is Slack safe with your data?

Slack

Salesforce (Slack Technologies)

65/100

Good disclosure · high confidence

Slack earns a B (65/100) because it discloses most of its data practices.

#29

of 211 apps ranked

score · Meeting intelligence avg 61

vs category average

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

Slack's public policy discloses no-train for LLMs with a named opt-out for global models, strong data-subject rights, named sharing recipients and SCC transfers, but is thin on retention periods, synthetic-output marking, named security controls and breach notice.

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

No LLM training

Slack states Customer Data (messages, files) is not used to train LLMs, with a named opt-out mechanism for global ML models.

Strong rights

Access, deletion, correction and objection rights are all named with concrete contacts (privacy@slack.com, dpo@slack.com).

Weak security disclosure

Security section names no concrete controls (no TLS/AES/RBAC), gives no breach-notice timeline, and retention is only 'as long as necessary'.

Ownership vs reuse

Terms say Customer owns Customer Data but do not clearly limit provider reuse to the service, so D1.4 is only partial.

What the policy is silent or vague on

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

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 rights4 of 5 disclosed

Grants a right to access your dataDisclosed

Grants a right to delete your dataDisclosed

Offers data portability in a usable formatSilent

Grants a right to correct your dataDisclosed

Grants a way to object to or opt out of processingDisclosed

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

Transparency3 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 basesDisclosed

Is versioned and dated, with change noticePartial

Sensitive data and children1 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 dataDisclosed

Security and accountability1 of 3 disclosed

Describes its security safeguardsSilent

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: 2026-07-08

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.