Grammarly records 58,867,412 monthly visits with -1.5% month-over-month growth and Freemium pricing. Manus records 19,195,779 monthly visits with -1.7% growth and Free Trial pricing.
Cross-platform AI writing assistant delivering real-time grammar correction, tone alignment, authorship tracking, and team style guides.
Ubiquitous Inline Rewriting & Tone Calibration
Works natively inside Chrome, Safari, Firefox, Edge, Windows, Mac, Google Docs, MS Office, and mobile keyboards to flag grammar mistakes, rewrite tangled sentences, and shift tone toward confident, empathetic, or executive registers.
Specialized AI Agents (AI Grader, Citation Finder & Reader Reactions)
Deploys contextual AI agents that predict how a target audience will react to a draft, locate credible supporting citations, grade essays against rubric criteria, and generate drafts using up to 2,000 monthly prompts on Pro.
Grammarly Authorship, AI Detector & Plagiarism Checker
Scans text against billions of web pages and academic databases for accidental plagiarism, detects AI-generated passages, and logs transparent document provenance via Authorship reports in Google Docs and Word.
Team Style Guides, Brand Tones & Knowledge Share
Enables teams on Pro and Enterprise plans to codify company terminology, ban deprecated jargon, enforce inclusive language, insert shared Snippets, and surface internal company definitions inline.
Strengths & Pros
+Frictionless cross-platform integration works inside virtually every browser, desktop app, email client, and mobile OS without copy-pasting into a separate chatbot.
Frequently Asked Questions: Grammarly vs Manus
Grammarly has 58,867,412 monthly visits, while Manus has 19,195,779. Traffic estimates describe audience size, not product quality.
Consolidating Premium and Business into Grammarly Pro ($12/member/month annual) gives individuals and small teams access to style guides, analytics, and plagiarism/AI detection in one plan.
+Grammarly Authorship provides a constructive, transparent audit trail for students and writers to demonstrate human writing integrity alongside responsible AI editing.
+Mature enterprise security posture featuring BYOK encryption, Data Loss Prevention, and granular application/domain blocklists.
Limitations
–Month-to-month billing on Grammarly Pro is steep at $30/member/month compared to the $12/member/month annual commitment ($144 billed upfront).
–Core writing intelligence and style rules remain primarily optimized for English dialects (US, UK, Canadian, Australian, Indian) rather than native multilingual grammar checking.
–Aggressive inline underlines and pop-up agent cards can feel visually intrusive in dense technical documents or code-heavy web editors unless muted per domain.
Manus
A general-purpose AI agent that executes tasks, not just answers them
Autonomous task execution
Give the agent a goal and it plans the steps, chooses tools, and works through the task in a cloud environment without constant supervision.
Deliverable generation
Produces finished artifacts such as slide decks, functional websites, small games, and formatted documents rather than raw text.
Wide Research
Runs broad, multi-source investigations and compiles the findings into a structured report.
Media creation
Generates images, video, and music as part of a larger task or as standalone outputs.
Strengths & Pros
+Delivers finished artifacts instead of only conversational answers
+Works across web, mobile, desktop, Slack, and API surfaces
+Wide Research handles broad multi-source investigations well
+Team plans and SSO make it usable in organizational settings
Limitations
–Autonomous runs consume credits and can pursue the wrong approach if the brief is vague
–Complex tasks benefit from human review at checkpoints
–Output quality varies by task type, especially outside common formats
Features advanced computer use and interactive artifacts, but operates primarily as a chat assistant rather than a dedicated autonomous agent platform.
Features advanced computer use and interactive artifacts, but operates primarily as a chat assistant rather than a dedicated autonomous agent platform.
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