Comparison

Quillbot vs Grammarly: Free AI Writing Assistance

Quillbot and Grammarly: Free AI Writing Assistance both land on Worth it.

Quillbot

Worth it

Confidence: Medium

Buy it if you're a student, non-native English writer, or blogger who wants cheap paraphrasing and grammar cleanup.

Worth it

Confidence: Medium

Buy the free tier for everyday writing . it is genuinely useful at $0.

Quillbot versus Grammarly: Free AI Writing Assistance
Compare	Quillbot	Grammarly: Free AI Writing Assistance
Verdict	Worth it	Worth it
Best for	Students editing essays and theses	Students and academics
Who it's not for	Anyone relying on its AI detector for high-stakes checks . accuracy is contested	Novelists fearing AI-detection flags
Privacy	No known public vulnerabilities found in the sources reviewed; GDPR/CCPA trust center is published, though it was named in a 2026 Chrome-extension privacy-risk report.¹¹	Third-party scan scores 89/100; official product security page published; no public CVEs found in reviewed sources.¹⁵
Support quality	Only a BBB complaint found; little support data	No support evidence in sources
Public sentiment	Reviews are broadly positive on value and paraphrasing quality, but users and independent testers distrust its AI detector.^¹	Casual users praise the free version, while some fiction writers report AI-detection accusations and fatigue with constant suggestions.¹⁶
Biggest gotcha	Don't trust its AI detector for high-stakes checks . testers and users report misses and false flags.^⁷	Advanced rewrites and tone tools sit behind Pro; the free tier nudges you to upgrade¹³

Anyone relying on its AI detector for high-stakes checks . accuracy is contested
Students trying to beat Turnitin . users report paraphrased text still gets flagged
Teams needing shared, collaborative writing workflows
Publishers wanting a human-editor replacement for serious manuscripts