Slack is one of the most widely used workplace communication platforms in the world, with over 65 million daily active users across hundreds of thousands of organisations. The Slack App Directory (Marketplace) hosts thousands of third-party apps and bots that extend Slack's functionality — from project management integrations and standup bots to AI assistants and analytics tools.

If you are building a Slack app, you are processing workplace data. This is not the same as processing data from a consumer social platform. Slack data often includes confidential business communications, internal project discussions, employee information, and sometimes customer data shared in support channels. The sensitivity of this data means that privacy requirements for Slack apps are particularly stringent, both from Slack's platform rules and from the legal frameworks that govern workplace data.

In 2026, Slack's App Directory review process explicitly requires a privacy policy. Enterprise customers run security and compliance reviews before approving any third-party app, and a missing or inadequate privacy policy is one of the most common reasons apps fail these reviews. This guide covers everything you need to include.

Why Your Slack App Needs a Privacy Policy

Slack's App Directory Requirements

If you want to list your app on the Slack App Directory (formerly the Slack Marketplace), Slack requires that you provide a privacy policy URL during the submission process. This URL is displayed on your app's listing page, and Slack's review team checks it during the approval process. Apps without a privacy policy — or with a clearly inadequate one — will be rejected.

Even if you are not listing on the App Directory and are distributing your app directly (via OAuth install links), having a privacy policy is still essential. Workspace administrators who evaluate your app before installation expect to see one. If you are building an internal app for a single organisation, the organisation's IT or security team will likely require a privacy policy or equivalent documentation before deployment.

Enterprise Security Reviews

Large organisations that use Slack Enterprise Grid have formal processes for approving third-party apps. These security reviews typically include:

Reviewing your privacy policy for completeness and accuracy
Evaluating the OAuth scopes your app requests
Assessing where data is stored and processed
Checking for SOC 2, ISO 27001, or similar certifications
Reviewing your data retention and deletion policies
Verifying your incident response procedures

A comprehensive privacy policy directly addresses many of these concerns and can significantly speed up the enterprise sales and approval process. Without one, your app will stall during procurement, costing you potential customers.

Legal Requirements for Workplace Data

Slack workspace data is subject to multiple privacy regulations:

GDPR — If any workspace members are based in the EU or UK, the data you process about them is personal data under GDPR. This includes their Slack user IDs, display names, messages, and any metadata.
CCPA/CPRA — If workspace members are in California, their data may be covered under CCPA, particularly if your app processes data from business-to-consumer interactions.
SOX and HIPAA — Some workspaces contain financial or health information subject to sector-specific regulations. If your app processes data from channels where such information is discussed, you may have additional obligations.
Employee data regulations — Many jurisdictions have specific laws governing the processing of employee data, which is exactly what most Slack data is.

What Data Do Slack Apps Typically Access?

The data your Slack app accesses depends on the OAuth scopes you request and the events you subscribe to. Understanding this is essential for writing an accurate privacy policy. Here are the most common data types:

Data Accessed via OAuth Scopes

User identity (users:read, users:read.email) — User IDs, display names, real names, email addresses, profile pictures, timezone, status
Messages (channels:history, groups:history, im:history, mpim:history) — The content of messages in channels, groups, direct messages, or multi-party DMs
Channel information (channels:read, groups:read) — Channel names, topics, purposes, member lists
Files (files:read) — Files shared in channels, including images, documents, and other attachments
Reactions (reactions:read) — Emoji reactions on messages
Team/workspace info (team:read) — Workspace name, domain, icon
User groups (usergroups:read) — User group memberships and details

Data Received via Events

Message events — Real-time notifications when messages are posted, edited, or deleted
Channel events — When channels are created, renamed, archived, or when members join or leave
User events — When users change their profile, status, or presence
App mention events — When users mention your app in messages
Slash command inputs — Text that users type after invoking your app's slash commands
Interactive component data — Button clicks, form submissions, modal inputs from your app's interactive elements

Data Your App Stores

OAuth tokens — Access tokens for each workspace that installs your app
User preferences — Settings and configurations individual users make within your app
Workspace configurations — Settings configured by workspace administrators
Processed or derived data — Analytics, summaries, reports, or any other data your app generates from Slack data
Message content — If your app stores messages for search, analytics, archiving, or AI processing

Essential Sections for Your Slack App Privacy Policy

1. App Identity and Developer Contact

State the name of your Slack app, who develops and operates it (your company or personal name), and how to contact you. Provide at least an email address for privacy-related inquiries. If you are a company, include your registered address. Under GDPR, you must identify yourself as the data controller (or data processor, depending on your relationship with the workspace).

2. Data Collection — Be Specific About Scopes

List every OAuth scope your app requests and explain what data each scope grants access to. This is crucial for transparency and is something Slack's review team specifically checks. Do not just list scopes — explain what data they expose in plain language.

For example, instead of simply listing channels:history, explain: “This scope allows the app to read message content in public channels. The app reads messages to [specific purpose, e.g., generate analytics reports, provide search functionality, summarise discussions].”

If your app requests scopes it does not currently use (sometimes done for future features), either remove those scopes or explain why they are requested. Requesting unnecessary scopes is a red flag during both Slack's review and enterprise security reviews.

3. Purpose of Data Processing

For each category of data your app accesses, explain clearly why it needs that data. Common purposes for Slack apps include:

Providing the app's core functionality (describe what your app does)
Responding to user commands and interactions
Generating reports, analytics, or summaries
Sending notifications or reminders
Integrating with external services (name them)
Improving the app based on usage patterns
Debugging and error resolution

4. Data Storage and Infrastructure

Enterprise customers care deeply about where their data is stored. Your privacy policy should address:

Storage location — Which cloud provider and region (e.g., AWS us-east-1, Google Cloud europe-west2)
Data at rest encryption — Whether stored data is encrypted and with what standard (e.g., AES-256)
Data in transit encryption — Confirm TLS encryption for all data transmission
Access controls — Who on your team can access workspace data, and under what circumstances
Backup and recovery — Whether data is backed up, where backups are stored, and backup encryption
Tenant isolation — Whether data from different workspaces is logically or physically separated

5. Data Retention and Deletion

State how long your app retains each type of data and what happens when a workspace uninstalls your app. This is one of the most scrutinised sections during enterprise security reviews. Address these scenarios:

Active use — How long data is retained while the app is installed and active
App uninstallation — What happens to data when a workspace removes your app. Best practice: delete workspace data within 30 days of uninstallation
Account deletion requests — How individual users can request deletion of their personal data
Workspace data export — Whether workspace admins can export their data before uninstalling
Retention exceptions — Any data retained after uninstallation (e.g., aggregated analytics, billing records) and why

6. Third-Party Data Sharing

Disclose every external service that receives or processes Slack workspace data:

Cloud infrastructure — AWS, Google Cloud, Azure, etc.
AI and ML services — If your app uses OpenAI, Anthropic, Google AI, or any other AI service to process messages or generate responses, this must be prominently disclosed. Many enterprises have strict policies about sending internal communications to AI services
Database providers — MongoDB Atlas, PlanetScale, Supabase, etc.
Analytics services — Mixpanel, Amplitude, PostHog, etc.
Error monitoring — Sentry, Bugsnag, Datadog, etc.
Payment processors — Stripe, Paddle, etc. (if your app has a paid tier)
Email services — SendGrid, Postmark, etc. (if your app sends emails)

For AI-powered Slack apps especially, disclosure of AI data processing is non-negotiable. Enterprise customers need to know whether their internal conversations are being sent to external AI models, whether those conversations are used for model training, and how AI-generated outputs are handled.

7. Data Controller vs Data Processor

Under GDPR, the distinction between data controller and data processor matters. For most Slack apps:

The workspace organisation is the data controller — they determine why and how employee data is processed
Your Slack app is typically a data processor — you process data on behalf of the workspace organisation according to their instructions (by installing and configuring your app)

State your role clearly in the privacy policy. If you are a data processor, you should also offer a Data Processing Agreement (DPA) to workspace organisations. Many enterprise customers will require one before installing your app.

8. User Rights Under GDPR and Other Laws

Even though workspace administrators typically manage data requests for their organisation, individual users may also contact you directly. Your privacy policy should explain how you handle:

Access requests — Providing individuals with the data you hold about them
Deletion requests — Removing an individual's data from your systems
Rectification requests — Correcting inaccurate data
Data portability requests — Providing data in a machine-readable format
Objection to processing — Handling objections to specific processing activities

Clarify that for workplace data, the workspace administrator is typically the primary point of contact for data requests, but provide your own contact details for direct inquiries.

9. Security Measures

Enterprise customers expect specific security commitments. Your privacy policy should cover:

Encryption standards (at rest and in transit)
Authentication and access control for your team
Vulnerability management and patching
Incident detection and response procedures
Regular security assessments or audits
Compliance certifications if applicable (SOC 2, ISO 27001)

You do not need to reveal proprietary security details, but providing a meaningful overview of your security programme demonstrates maturity and builds confidence with potential customers.

10. International Data Transfers

If your app processes data from EU or UK workspaces and your servers are in the US (or any country without an adequacy decision), you must disclose the transfer and the legal mechanism that protects it. Standard Contractual Clauses (SCCs) are the most common mechanism. The EU-US Data Privacy Framework may also apply if your organisation is certified under it.

11. Changes to the Privacy Policy

State how you will notify workspace administrators and users about material changes to your privacy policy. Best practices for Slack apps include:

Sending a Slack message to workspace administrators via your app when the privacy policy is updated
Posting updates on your app's website or changelog
Emailing workspace administrators who have provided contact details
Maintaining a version history of your privacy policy with dates and summaries of changes

Special Considerations for Different Slack App Types

AI-Powered Slack Apps

AI assistants, summarisation tools, and chatbots that use large language models (LLMs) have the most complex privacy requirements. If your Slack app sends message content to an external AI provider, you must disclose:

Which AI provider(s) you use (OpenAI, Anthropic, Google, self-hosted, etc.)
What data is sent to the AI provider (message content, user names, file contents)
Whether the AI provider retains the data, and for how long
Whether the data is used for model training (most enterprises will reject your app if the answer is yes)
What safeguards are in place to prevent data leakage between workspaces through the AI model
Whether you offer the option to use a self-hosted or private AI deployment for enterprise customers

This is the single most important disclosure for AI Slack apps. Enterprises are intensely concerned about their internal communications being processed by external AI models, and rightly so. Be transparent, specific, and proactive in addressing these concerns.

Analytics and Reporting Apps

Apps that analyse message patterns, engagement metrics, or team activity need to address the sensitive nature of workplace analytics. Disclose exactly what metrics you track, whether individual users can be identified in reports, and how you handle the difference between aggregated analytics (lower privacy risk) and individual-level tracking (higher privacy risk). Many jurisdictions have specific regulations about employee monitoring that may apply.

Integration and Workflow Apps

Apps that connect Slack to external tools (Jira, GitHub, Salesforce, Google Workspace, etc.) create data flows between platforms. Your privacy policy must map these flows: what data moves from Slack to the external service, what data moves back, and what data your app retains in between. If the external service has its own privacy policy, link to it.

Standup and HR Bots

Bots that collect standup updates, feedback, mood check-ins, or other HR-adjacent data are processing particularly sensitive employee information. Disclose who can access these submissions (just the user, their manager, the entire team, workspace admins), how long the data is retained, and whether it can be used for performance evaluation purposes. This is an area where employee data protection laws may impose additional requirements.

Slack App Directory Review — What Slack Checks

When you submit your app to the Slack App Directory, Slack's review team evaluates your privacy policy alongside your app's functionality. Based on publicly available guidance and developer experiences, Slack checks for:

A valid, accessible privacy policy URL
The privacy policy must be specific to your app (not a generic corporate policy that does not mention Slack)
Clear disclosure of what data your app accesses and why
Alignment between your requested OAuth scopes and what your privacy policy describes
Explanation of how data is stored and for how long
Disclosure of any third-party services that receive workspace data
Contact information for privacy inquiries
Information about how data is handled when the app is uninstalled

Apps that request sensitive scopes (like channels:history or files:read) face closer scrutiny. If you request scopes that your app does not appear to need, your submission may be rejected or you may be asked to justify the scope request.

Common Mistakes in Slack App Privacy Policies

Using a generic website privacy policy. A website privacy policy covers cookies, contact forms, and web analytics — none of which are relevant to a Slack app. Your privacy policy must be written for the specific context of a Slack integration that processes workspace data.
Not disclosing AI data processing. If your app sends messages to an AI provider, this must be clearly stated. Many developers bury this detail or omit it entirely, which is both a legal risk and a trust violation.
Requesting excessive OAuth scopes. If your privacy policy says you only read messages in channels where your bot is mentioned, but your OAuth scopes include channels:history for all channels, there is an inconsistency that Slack's reviewers and enterprise security teams will flag.
No uninstallation data handling. Workspace admins need to know what happens to their data when they remove your app. If your privacy policy does not address this, it will fail enterprise security reviews.
Ignoring the data processor role. Most Slack apps are data processors under GDPR, processing data on behalf of the workspace organisation. If your privacy policy does not acknowledge this relationship or offer a DPA, enterprise GDPR-conscious customers will not adopt your app.
Vague data retention statements. Saying “we retain data for as long as necessary” is insufficient. Enterprise customers and regulators expect specific timeframes: “message data is retained for 90 days; OAuth tokens are retained while the app is installed; all workspace data is deleted within 30 days of uninstallation.”

Data Processing Agreements for Slack Apps

If you sell to EU/UK organisations or enterprise customers, you will need to provide a Data Processing Agreement (DPA) alongside your privacy policy. A DPA is a legal contract between the data controller (the workspace organisation) and the data processor (your app) that specifies how personal data is processed.

Key elements of a DPA for Slack apps include:

Subject matter and duration of processing
Nature and purpose of processing
Types of personal data processed
Categories of data subjects (workspace members)
Your obligations as a processor (security measures, breach notification, sub-processor management)
The controller's rights (audit rights, instruction rights)
Sub-processor list and notification procedures
Data transfer mechanisms for international transfers

Having a DPA ready before enterprise customers ask for one significantly accelerates the sales process.

Where to Host Your Slack App Privacy Policy

Your privacy policy needs to be accessible at a public URL. Slack requires this URL during the app submission process, and it is displayed on your app's directory listing. Common options:

Your app's website — The ideal location (e.g., yourapp.com/privacy)
GitHub Pages — Free and reliable if you do not have a dedicated website
Notion or Coda — Quick to set up but looks less professional for enterprise customers

Whichever you choose, ensure the URL is stable. Changing your privacy policy URL after your app is listed requires updating the Slack App Directory listing, and a broken link during an enterprise security review creates a poor impression.

Generate Your Slack App Privacy Policy

Writing a privacy policy for a Slack app requires addressing platform-specific concepts like OAuth scopes, workspace data, bot tokens, event subscriptions, and the enterprise security review process. You need to cover GDPR data processor obligations, handle the nuances of workplace data, and provide the level of detail that enterprise customers expect.

LegalForge generates privacy policies tailored to Slack apps and bots. Tell us what your app does, which scopes it uses, what data it stores, whether it connects to AI services, and what infrastructure it runs on — and we produce a complete, compliant privacy policy in about 60 seconds. The policy covers Slack App Directory requirements, GDPR processor obligations, enterprise security review expectations, and AI data processing disclosures.

Key Takeaways

Every Slack app that processes workspace data needs a privacy policy. This is required by Slack's App Directory, expected by enterprise customers during security reviews, and mandated by GDPR and other privacy laws. Your privacy policy must specifically describe what OAuth scopes your app requests, what data it accesses and stores, where that data is processed, which third parties receive it, how long it is retained, and what happens when the app is uninstalled.

Do not use a generic website privacy policy for your Slack app. Slack apps operate in a completely different context from websites, and the data handling patterns are fundamentally different. A website privacy policy that talks about cookies and contact forms says nothing about OAuth scopes, workspace data, bot tokens, or the data processor relationship.

If your Slack app uses AI services to process messages, make this your highest-priority disclosure. Enterprise customers are hyper-aware of where their internal communications end up, and transparency about AI data flows is the single biggest trust factor for AI-powered Slack apps in 2026.

Invest in a proper privacy policy now, and you will save yourself weeks of back-and-forth during enterprise sales, avoid Slack App Directory rejections, and build the trust that drives adoption. The cost of getting it right upfront is a fraction of the cost of losing an enterprise deal because your privacy documentation was inadequate.

Privacy Policy for Slack Bots and Apps: Complete Developer Guide