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Documentation · head to head

Grammarly vs Slab

Grammarly logo

Grammarly

Documentation

Great writing, simplified

From
Free
Rated
-
Full reviewWebsite
Slab logo

Slab

Documentation

Internal knowledge base for teams, organised by topic rather than folders, with search across connected tools

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Grammarly occasional false positives and grammatically incorrect suggestions that can introduce errors; Slab it is built for internal knowledge, so public product documentation on a custom domain with versioning is outside what the product does.
  • They diverge on capability: Grammarly covers Grammar checking, Slab covers Topics instead of folders.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Grammarly and Slab actually diverge.

Attributes where Grammarly and Slab differ
AttributeGrammarlySlab
Pricing modelUnknownPer user per month
PlatformsWeb, macOS, Windows, iOS, AndroidWeb
Founded2009Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Documentation).

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 Grammarly

  • Grammar checking
  • Spelling correction
  • Punctuation
  • Clarity suggestions
  • Engagement feedback
  • Delivery insights
  • Plagiarism checker
  • Citation generator

Only in Slab

  • Topics instead of folders
  • Unified search
  • Post verification
  • Quill editor
  • Permissions
  • Free tier for small teams

What people use each for

The jobs each tool is most often brought in to do.

Grammarly

  • Email writingnot Slab
  • Document editingnot Slab
  • Academic writingnot Slab
  • Business communicationnot Slab
  • Content creationnot Slab

Slab

  • Building an employee handbook and onboarding path that new starters can actually findnot Grammarly
  • Replacing a folder-based wiki where nobody agrees which folder a document belongs innot Grammarly
  • Companies whose knowledge is already spread across Drive, Slack and GitHub and needs one search boxnot Grammarly
  • Documenting process and decisions for teams that do not want a project management tool attachednot Grammarly

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Grammarly

  • Occasional false positives and grammatically incorrect suggestions that can introduce errors
  • Privacy concerns about sending text to Grammarly's servers for analysis
  • AI capabilities sometimes produce hallucinations and fabricated citations that appear grammatically correct

Slab

  • It is built for internal knowledge, so public product documentation on a custom domain with versioning is outside what the product does.
  • There is no docs-as-code workflow, no git synchronisation and no markdown files on disk, so engineering-owned technical documentation ends up somewhere else anyway.
  • Hierarchy is shallow by design, and organisations that genuinely need deep nested structure find topics an awkward substitute rather than an improvement.
  • There is no offline mode, so a knowledge base that includes incident runbooks is unavailable during exactly the incident where the network is the problem.
  • Pricing is per user per month, so organisations where most staff only read a handbook twice a year still pay a seat for each of them.

Pricing, plan by plan

Grammarly

Free
  • FreeFree
    • Basic grammar and spelling checks
    • Tone visibility
    • 100 AI prompts per month
  • Pro$12/month
    • Sentence rewrites
    • Tone adjustment
    • Plagiarism and AI detection

Slab

Free
  • FreeFree
    • Up to ten users
    • Unlimited posts
    • Core integrations
  • Slab$undefined/month
    • Priced per user per month with annual billing
    • Unlimited users and history
    • Full integration set and unified search

Which should you pick?

Choose Grammarly if

  • You need grammar checking.
  • You want to start without paying.
  • You work on Web, macOS, Windows, iOS, Android.
  • You also want spelling correction.
Grammarly review

Choose Slab if

  • You need topics instead of folders.
  • You want to start without paying.
  • You also want unified search.
Slab review

Questions people ask

Is Grammarly or Slab better?
Neither clearly leads. Grammarly starts at Free and Slab at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Grammarly or Slab?
Grammarly starts at Free and Slab at Free.
Does Grammarly or Slab run on more platforms?
Grammarly runs on Web, macOS, Windows, iOS, Android. Slab runs on Web.
Can I use Grammarly for free?
Both have a free tier, so you can try either at no cost before committing.
What is Grammarly best used for?
Grammarly is most often used for email writing, document editing, academic writing, business communication. Of those, email writing and document editing are not what Slab is typically brought in for.
What can Grammarly do that Slab cannot?
Grammarly covers Grammar checking, Spelling correction, Punctuation, Clarity suggestions. Slab covers Topics instead of folders, Unified search, Post verification, Quill editor.

Answered from the vendors’ own pages

Grammarly: Does Grammarly have a free version?

Yes, Grammarly offers a free tier with basic spelling, grammar, and punctuation checks, tone visibility, and 100 AI prompts per month. The Pro plan ($12/month annual) adds sentence rewriting, plagiarism detection, and 2,000 AI prompts.

Source
Slab: Can I publish documentation publicly with Slab?

Posts can be shared by link, but it is not a product documentation platform. There is no custom domain publishing, versioning or API reference tooling.

Grammarly: What platforms does Grammarly work with?

Grammarly works across 1 million+ apps including Google Docs, Microsoft Word, Outlook, Slack, Gmail, and web browsers. It also integrates with productivity tools like Asana, Jira, Monday.com, Confluence, and HubSpot.

Source
Slab: What does the free plan actually cover?

Up to ten users with unlimited posts and core integrations. It is a real free tier rather than a trial, and it is enough for a small company handbook.

Grammarly: Can I use Grammarly offline?

Grammarly requires an internet connection to function, though the browser extension works with some offline text areas. For offline use, the desktop app and browser extensions sync when reconnected.

Source
Slab: How does it compare with a general workspace tool?

Slab does less on purpose. There are no databases, boards or task views, which makes it faster to write in and much harder to turn into an unmaintained sprawl.

Grammarly: What is included in the Enterprise plan?

The Enterprise plan includes unlimited team members, dedicated support, custom roles and permissions, data loss prevention, bring-your-own-key encryption, and unlimited AI prompts. Pricing is custom and available by contacting sales.

Source
Slab: Does search really cover other tools?

Yes, connected sources are indexed and appear in results. That integration is the main reason to choose it, so verify your specific tools are supported before committing.

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