Productivity · head to head
Microsoft OneNote vs Slack
Microsoft OneNote
Productivity
Microsoft's free-form notebook, free with a Microsoft account and synced through OneDrive
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Microsoft OneNote notes live in a proprietary notebook format on OneDrive or SharePoint and the only exports are a OneNote file, a PDF or a Word document, produced section by section, so a large notebook is effectively unmovable to any other tool.; Slack 90-day message history limit on free plan results in important conversations disappearing
- They diverge on capability: Microsoft OneNote covers Free-form page canvas, Slack covers Channels.
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which Microsoft OneNote and Slack actually diverge.
| Attribute | Microsoft OneNote | Slack |
|---|---|---|
| Pricing model | freemium | Unknown |
| Platforms | Web, IOS, Android, MacOS, Windows | Web, iOS, Android, macOS, Windows, Linux |
| Category | Productivity | Communication |
| Founded | 1975 | 2009 |
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Microsoft OneNote
- Free-form page canvas
- Notebook hierarchy
- Indexed handwriting
- Audio recording
- Web clipper and Outlook capture
- Shared notebooks
- Cross-platform clients
- Tags and cross-notebook search
Only in Slack
- Channels
- Direct messaging
- Voice & video calls
- Screen sharing
- File sharing
- Search
- Workflow builder
- Slack Connect
What people use each for
The jobs each tool is most often brought in to do.
Microsoft OneNote
- Handwritten notes on a pen tablet that you still need to find months later by searching for a word you wrote.not Slack
- Lecture or meeting notes where a recording needs to line up with what you were typing at the time.not Slack
- A team already inside Microsoft 365 that needs a shared notebook without buying anything or seeking approval.not Slack
- Collecting mixed material such as screenshots, clippings and sketches on one page, where a document editor would force a linear structure.not Slack
Slack
- Team communicationnot Microsoft OneNote
- Project coordinationnot Microsoft OneNote
- Customer supportnot Microsoft OneNote
- Remote worknot Microsoft OneNote
- Cross-functional collaborationnot Microsoft OneNote
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Microsoft OneNote
- Notes live in a proprietary notebook format on OneDrive or SharePoint and the only exports are a OneNote file, a PDF or a Word document, produced section by section, so a large notebook is effectively unmovable to any other tool.
- Personal notebooks consume OneDrive quota, which is 5 GB on a free Microsoft account, so a notebook full of scans, images and recordings quietly exhausts the whole account including the space Outlook needs for mail.
- Sync happens at section level and conflicts are resolved by placing both versions on the page, so simultaneous edits to a large or media-heavy section produce duplicated content that somebody has to merge by hand.
- Search behaves differently across clients, so what the Windows desktop app finds inside handwriting, images and attachments is not necessarily what the browser or mobile version finds, and the same query gives different answers on different devices.
- There is no relational structure, no database and no properties, so anything that needs a table of records with fields has to be maintained by hand or moved elsewhere, and OneNote's own tables cannot be queried or filtered.
Slack
- 90-day message history limit on free plan results in important conversations disappearing
- Per-user pricing becomes expensive quickly for larger teams
- Notification overload with 78% of employees feeling overwhelmed by notifications
- Mobile app performance issues including lag and slow syncing
- Huddles limited to 50 people and cannot be recorded
- Requires dedicated video conferencing service for formal meetings and webinars
Pricing, plan by plan
Microsoft OneNote
FreeNo published plan breakdown. See the Microsoft OneNote review.
Slack
FreeNo published plan breakdown. See the Slack review.
Which should you pick?
Choose Microsoft OneNote if
- You need free-form page canvas.
- You want to start without paying.
- You work on Web, IOS, Android, MacOS, Windows.
- You also want notebook hierarchy.
Choose Slack if
- You need channels.
- You want to start without paying.
- You work on Web, iOS, Android, macOS, Windows, Linux.
- You also want direct messaging.
Questions people ask
- Is Microsoft OneNote or Slack better?
- Neither clearly leads. Microsoft OneNote starts at Free and Slack at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Microsoft OneNote or Slack?
- Microsoft OneNote starts at Free and Slack at Free.
- Does Microsoft OneNote or Slack run on more platforms?
- Microsoft OneNote runs on Web, IOS, Android, MacOS, Windows. Slack runs on Web, iOS, Android, macOS, Windows, Linux.
- Can I use Microsoft OneNote for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Microsoft OneNote best used for?
- Microsoft OneNote is most often used for handwritten notes on a pen tablet that you still need to find months later by searching for a word you wrote., lecture or meeting notes where a recording needs to line up with what you were typing at the time., a team already inside microsoft 365 that needs a shared notebook without buying anything or seeking approval., collecting mixed material such as screenshots, clippings and sketches on one page, where a document editor would force a linear structure.. Of those, handwritten notes on a pen tablet that you still need to find months later by searching for a word you wrote. and lecture or meeting notes where a recording needs to line up with what you were typing at the time. are not what Slack is typically brought in for.
- What can Microsoft OneNote do that Slack cannot?
- Microsoft OneNote covers Free-form page canvas, Notebook hierarchy, Indexed handwriting, Audio recording. Slack covers Channels, Direct messaging, Voice & video calls, Screen sharing.
Answered from the vendors’ own pages
Microsoft OneNote: Is OneNote really free?
Yes. The application is free with a Microsoft account, with no time limit and no feature gate. What you may end up paying for is the OneDrive storage the notebooks consume.
Slack: Does Slack have a free plan?
Yes, Slack offers a free plan indefinitely with no credit card required. Free users get 90-day message history, up to 10 app integrations, and 1:1 huddles.
SourceMicrosoft OneNote: Can I keep notebooks off Microsoft's cloud?
The Windows desktop app can keep local notebooks, but they will not sync to other devices and any shared access requires OneDrive or SharePoint.
Slack: What are Slack's pricing plans?
Slack offers Free, Pro ($7.25/user/month with annual billing), Business+ ($12.50/user/month), and Enterprise Grid (custom pricing). Monthly billing costs approximately 20% more than annual.
SourceMicrosoft OneNote: How do I get my notes out?
Section by section as a OneNote file, a PDF or a Word document. A OneNote package preserves a whole notebook but only for another copy of OneNote. Third-party converters exist and the page layout usually does not survive them.
Slack: Does Slack support offline use?
Slack is a cloud-based platform and does not support robust offline work. Internet connectivity is required to access messages and collaborate.
SourceMicrosoft OneNote: Which version should I install?
Microsoft consolidated onto a single OneNote application on Windows after retiring the Store version, so install the one distributed with Microsoft 365 rather than looking for an alternative.
Slack: What integrations does Slack support?
Slack integrates with 43+ apps on average per team, including Google Drive, ChatGPT, Vercel, Asana, GitHub, and many others through their app marketplace.
SourceRelated pages
More on Microsoft OneNote
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- Slack vs Samsung Food
- Slack vs Bluedot
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- Slack vs Loom
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- Slack vs Webex by Cisco
- Slack vs Microsoft Teams
- Slack vs Sessions
- Slack vs Twist
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- Slack vs Viber
- Slack vs Chanty
- Slack vs Disciple
- Slack vs Flock
- Slack vs Google Chat