Otter.ai vs Slack

Two HR tools side by side: what each does, what it costs and who it suits.

The verdict Side by side Plans and pricing Who each is for Other options

The verdict

On the data we hold, it's close: neither pulls ahead on features, a free plan or AI access. The choice comes down to how you work.

What the data says

Both cover 3 of the 3 features we compared.
Both have a free plan, so you can try each before you pay.
Both have an API and an MCP server, so either works with AI employees.
In our HR ranking, Otter.ai places 5 and Slack 3 of 27.

Side by side

Otter.ai and Slack compared
7 points compared	Otter.ai	Slack
Starts at	$8.33/mo	€8.25/mo
Free plan	Yes	Yes
API	Yes	Yes
MCP server	Yes	Yes
AI summary + action items	Yes	Yes
Guest / external access	Yes	Yes
Workflow automation	Yes	Yes
Links	Visit	Visit

Plans and pricing

Otter.ai

BasicFree: 300 monthly transcription minutes, 3 lifetime file imports, includes the Otter MCP server.Free
ProPer user: 1,200 monthly minutes, 90 minutes per meeting. Annual billing shown as $8.33 per user per month.$16.99/mo/seat
BusinessPer user: unlimited meetings, 4 hours per meeting, admin features. Annual billing shown as $19.99 per user per month.$30/mo/seat

Slack

FreeFree forever: 90 days of message history, up to ten apps, 1:1 meetings.Free
ProEUR 8.25 per user per month when paying monthly; unlimited history and apps; 50% off for the first three months.€8.25/mo/seat
Business+EUR 18 per user per month when paying monthly; advanced AI and SAML single sign-on; 50% off for the first three months.€18/mo/seat

Prices as the vendors list them. They change often; the final price is on their sites.

Who each is for

Choose Otter.ai if…

Sales, recruiting, education and media teams who spend a lot of time in calls and want transcripts, summaries and action items they can search later.

Visit Read the review

Choose Slack if…

Teams of any size that need real-time messaging, channels and quick decisions in one place, and want chat connected to their CRM, project tools and alerts.

Visit Read the review

Other options worth a look

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Confluence
Creates a shared workspace and wiki for team documentation, knowledge, and collaboration with built-in AI.
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From $5.42/moFree plan
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Miro
Bring teams together on an infinite whiteboard to brainstorm, diagram and run workshops in real time.
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From $8/mo yearlyFree plan
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Google Docs
Write and edit documents collaboratively in the browser with instant sharing and version history.
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From €6.80/moFree plan
Sign up on Google Docs
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Trainual
Centralises standard operating procedures, quizzes and onboarding materials in a searchable knowledge base.
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From $3/mo yearlyAffiliate link
Sign up on Trainual
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Bloom Growth OS
The Bloom Growth Operating System: scorecard, meetings, goals and issues on one platform, the software half of the EOS/Traction category.
HR
From $299/mo
Sign up on Bloom Growth OS
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Zoom AI Companion
AI assistant built into Zoom that generates meeting summaries, action items and automated follow-up tasks.
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From €15.33/mo yearlyFree plan
Sign up on Zoom AI Companion