Verdict
What is Grammarly?
Grammarly checks and improves writing in place — in your browser, in Word, in email — rather than in a separate window.
What it does well
Catching the errors that make business writing look careless, and adjusting register when a draft is too casual or too stiff.
Who should use it
Anyone who writes to clients daily, and especially people writing in English as a second language.
Who should not use it
Writers with a strong voice who will spend more time rejecting suggestions than accepting them, and anyone who needs drafting rather than editing.
Related reading
How we tested
Same source documents
Same job, every tool
One prompt per job
No re-rolls
Human review
Two editors, blind
Scored against the rubric
Published Sep 2026
Where it fits
Good for
- Anyone writing to clients daily
- Writers working in English as a second language
Not for
- Anyone who needs drafting rather than editing
Pros
- Catches errors that make business writing look careless
- Adjusts register when a draft is too casual or too stiff
- Works in place across browser, Word, and email
Cons
- Strong-voice writers spend more time rejecting suggestions than accepting them
- Editing tool, not a drafting tool
Similar tools
8/10
Google’s assistant, closely tied to Gmail, Docs, Drive and Workspace.
8/10
Meeting transcription and notes with searchable history.