Slack Pricing (2026): Free vs Pro vs Business+ vs Enterprise
Slack is the messaging platform that replaced email for internal team communication. It’s fast, organized by channels, and integrates with practically everything. But Slack’s free plan has real limitations, and the paid plans add up quickly as your team grows.
Here’s what Slack costs in 2026 and whether upgrading makes sense for your firm.
Slack Pricing Plans (2026)
| Plan | Monthly Price | Annual Price | Per User |
|---|---|---|---|
| Free | $0 | $0 | N/A |
| Pro | $8.75/user/mo | $7.25/user/mo | Yes |
| Business+ | $18/user/mo | $12.50/user/mo | Yes |
| Enterprise Grid | Custom | Custom | Yes |
All paid plans offer both monthly and annual billing. Annual billing saves roughly 15-30% depending on the plan.
Free Plan: $0
Slack’s free plan works for very small teams, but the message history limit is the killer.
What’s included:
- Unlimited users in your workspace
- Unlimited channels
- 1:1 voice and video calls (huddles)
- Screen sharing in huddles
- 10 integrations with other apps
- 5 GB storage per workspace
- Standard support
What’s limited:
- 90 days of message history (older messages are hidden, not deleted)
- 90 days of file history
- No group voice/video calls (only 1:1)
- 10 app integrations maximum
- No guest access controls
- No custom user groups
- No shared channels with other organizations
- Slack Connect (external messaging) limited to 1 organization
Best for: Solo professionals or teams of 2-3 people who just need basic messaging. If you don’t need to reference old conversations and only use a few integrations, the free plan works for a while.
Pro Plan: $7.25-$8.75/user/month
This is where most small teams land. Unlimited message history is the biggest upgrade.
Everything in Free, plus:
- Unlimited message history (search everything, forever)
- Unlimited file history
- Group voice and video calls (up to 50 people)
- Screen sharing with annotations
- Unlimited app integrations
- Custom user groups
- Guest access controls
- Slack Connect with up to 2 organizations
- Priority support (faster response times)
- 10 GB storage per member
What’s limited:
- No SAML-based single sign-on (SSO)
- No compliance features (data retention policies, exports)
- No custom retention policies
- No HIPAA compliance
- 2 organizations for Slack Connect
- 10 GB storage per member (may not be enough for document-heavy firms)
Best for: Small to mid-size teams (5-50 people) that need to search old conversations, use multiple integrations, and want group video calls. Most law firms with fewer than 20 attorneys fit well here.
Business+: $12.50-$18/user/month
The plan for organizations that need compliance features and advanced identity management.
Everything in Pro, plus:
- SAML-based single sign-on (SSO)
- Compliance features (data exports, audit logs)
- Custom data retention policies
- 20 GB storage per member
- 99.99% uptime SLA
- 24/7 support with 4-hour response time
- Unlimited Slack Connect organizations
- HIPAA compliance (with Business Associate Agreement)
What’s still extra:
- Slack AI (add-on for search and summarization)
- Enterprise Key Management
- Some compliance features require Enterprise Grid
Best for: Regulated industries (healthcare, finance, legal) that need compliance features, SSO, and data retention policies. Law firms with compliance requirements or firms that need HIPAA compliance should start here.
Enterprise Grid: Custom Pricing
The top-tier plan for large organizations with complex needs.
Everything in Business+, plus:
- Unlimited workspaces under one org
- Organization-wide channels
- HIPAA compliance included
- Enterprise Key Management (customer-managed encryption keys)
- Data residency options
- Dedicated customer success team
- Custom terms of service
- Unlimited Slack Connect
- 1 TB storage per member
Best for: Large law firms (100+ attorneys), multi-office organizations, or firms with strict data residency requirements. Overkill for most small to mid-size firms.
Hidden Costs to Watch
Slack AI: Slack’s AI-powered search and summarization is an add-on on all plans. It’s not included in any base plan.
Storage limits: Free plan has 5 GB total workspace storage. Pro has 10 GB per member. If your firm shares lots of documents through Slack, you may hit these limits.
Slack Connect: Connecting with external organizations (clients, co-counsel, opposing counsel) is limited on lower plans. Free only allows 1 organization, Pro allows 2, and Business+ allows unlimited.
Compliance exports: If you need to export messages for legal discovery or compliance, this feature requires Business+ or higher. Free and Pro plans don’t offer compliance-grade exports.
Guest access: External guests (clients, consultants) require Pro or higher. The free plan doesn’t support controlled guest access.
How Slack Compares
Slack competes primarily with Microsoft Teams, which is included with Microsoft 365 subscriptions. If you’re already paying for Microsoft 365, Teams is essentially free.
For law firms, Slack’s advantage is its integration ecosystem and ease of use. It connects with Clio, PracticePanther, and other legal tools more cleanly than Teams.
However, if your firm uses Microsoft 365 for email and document management, Teams may be the more cost-effective choice since it’s already included.
If your firm is evaluating communication tools, you might also be looking at project management platforms. Our guides on Monday.com pricing, Asana pricing, and ClickUp pricing cover tools that integrate with Slack for task management. For lawyers specifically, our AI client communication guide covers how to use messaging tools while maintaining professional standards.
Which Plan Should You Pick?
Choose Free if:
- You have fewer than 5 people
- You don’t need to search old messages
- You only use a few integrations
Choose Pro ($7.25-$8.75/user/mo) if:
- You need unlimited message history
- You use multiple app integrations
- You want group video calls
Choose Business+ ($12.50-$18/user/mo) if:
- You need SSO or compliance features
- You require data retention policies
- You need HIPAA compliance
Choose Enterprise Grid (custom) if:
- You have 100+ users across multiple offices
- You need data residency or encryption key management
- You require organization-wide channels
For most small to mid-size law firms, Pro is the right starting point. Upgrade to Business+ when compliance requirements or SSO needs justify the additional cost.
FAQ
Does Slack offer a free trial? Slack’s free plan is permanent. For paid plans, you can try Pro or Business+ features during a trial period. Check Slack’s website for current trial offers.
Can I switch plans later? Yes. You can upgrade or downgrade at any time. Upgrades take effect immediately, and downgrades take effect at the end of your billing cycle.
Is Slack secure enough for law firms? Pro and above offer encryption in transit and at rest. Business+ adds SSO and compliance features. For attorney-client privilege concerns, Business+ or Enterprise Grid with HIPAA compliance is recommended.
How does Slack handle legal holds and e-discovery? Business+ and Enterprise Grid offer compliance features including data exports and retention policies. For e-discovery, you’ll need Business+ at minimum, and Enterprise Grid offers more advanced options.
Can I use Slack to communicate with clients? Yes, through Slack Connect. This allows you to create shared channels with external organizations. Free plan allows 1 organization, Pro allows 2, and Business+ allows unlimited.