I write professionally in English as a third language and Grammarly is part of every document I produce

Practical perspective that might be useful for others in the same situation.

I am Portuguese, learned English as a second language and use it professionally every day for reports, client communications and presentations. My grammar is solid but certain patterns, articles, prepositions, subtle register differences, still trip me up. And I am a fast typist which means mistakes I make, I make consistently.

Grammarly catches the things I reliably get wrong. It knows my patterns after using it long enough to have trained it on my writing. The suggestions are not just grammatical corrections, they flag when my phrasing sounds unusual for a native speaker even if it is technically correct. "This is grammatically fine but here is how it is more commonly expressed" is a useful signal that goes beyond spell check.

The Goal-Based Customization is the feature I use deliberately for different writing contexts. Setting the audience to Expert versus General changes the register of suggestions. Setting the intent to Convince versus Inform changes how it evaluates directness and framing. A client proposal and an internal technical report need different things and the suggestions adjust accordingly.

The Tone adjustments are what I rely on most for emails. Professional English tone varies more than I realized early in my career and getting feedback on whether something reads as appropriately confident, too abrupt or too hedged is genuinely useful when the cultural calibration is not intuitive.

Cross-platform integration means it is running everywhere I write without me switching to a separate tool. Browser, desktop app, mobile keyboard.