Pros & Cons
✓ PROS
Works everywhere — browser, Word, Docs, email, Slack
Tone detector prevents off-brand communication
Style guide enforcement across teams
GrammarlyGO generates and rewrites in context
Plagiarism checker included
✗ CONS
Expensive for solos at Business tier
AI rewrites sometimes too conservative
Free plan now aggressively pushes upgrades
Who Should Use It?
✓ Great for
→ Marketing teams
→ Agencies
→ Anyone writing professional emails daily
✗ Not ideal for
→ Long-form content creation
→ Creative fiction
→ Budget-conscious freelancers
Real Output Sample
Actual output from our test session — same prompt across all tools so you can compare.
GRAMMARLY BUSINESS · REAL OUTPUTEmail draft before Grammarly:
"hey can we chat about the project i think theres some issues we need to discuss asap"
After Grammarly (Professional tone):
"Hi [Name], could we find time to connect about the project? I've identified a few items that would benefit from a quick discussion. Are you available this week?"
Clarity score: 94 · Tone: Professional ✓ · Correctness: 100
Marcus Webb
Founder, WriteTested · 14 years in content · 500+ hours testing AI tools
I ran a 20-person content agency before GPT-4 changed the industry. I shut down half the team and started testing every AI writing tool obsessively. Every score on this site comes from real work — not toy prompts, not sponsored placements.