Grammarly

Grammarly checks spelling, grammar, punctuation and tone as you write, in a browser, in Word and in its own editor. The obvious benefit is fewer mistakes. The one people actually talk about is confidence.

If you have spent years worrying that an email gives you away, having something check it before you press send changes how it feels to write at work. That is a reasonable thing to want, and a reasonable thing to fund.

• The dedicated editor is the reliable route. Suggestions in the standalone Grammarly editor are easier to reach and work through than the ones the browser extension overlays on other sites. Writing there and pasting back is a sound working pattern.
• Work through suggestions one at a time. Accepting everything in one go removes errors and your voice with them. Going through them individually keeps the writing yours.
• Set the goals before you write. Telling it the audience and formality up front produces far more sensible suggestions than correcting its assumptions afterwards.
• Treat tone feedback as information, not instruction. It is guessing at how a reader might take your words. Sometimes it is right and sometimes your blunter version was better.

• It fights with Google Docs. The extension and Docs both want to manage the text. If it misbehaves, draft in the Grammarly editor and paste in.
• It flags correct technical terms. Add them to your personal dictionary once and it stops.
• Suggestions pile up on a long document. Work section by section rather than trying to clear a whole report in one pass.
• The best features are paid. Tone rewriting and plagiarism checking sit behind the premium tier. Worth knowing before you plan around them.

Writers with dyslexia, people with ADHD who produce good ideas in a rough first draft, and anyone writing in a second language. It is one of the lower cost items that makes a daily difference.