How do their growth rates compare?

Grammarly has a month-over-month growth rate of -1.5%; TopPDF has -90.6%.

How does pricing compare?

Grammarly: Freemium. Free plan ($0/month) includes core grammar and spelling checks, tone detection, and 100 generative AI prompts/month; Grammarly Pro costs $12/member/month billed annually ($144/year, or $30/month billed monthly) with full-sentence rewrites, plagiarism/AI detection, team style guides, and 2,000 AI prompts/month, while Enterprise offers custom pricing with unlimited AI prompts and BYOK security. TopPDF: Freemium. Freemium. Core PDF tools such as editing, conversion and compression can be used for free with limits, while a paid subscription unlocks larger files, advanced editing and higher usage volumes. Exact plan prices are shown inside the product rather than on a public pricing page, so check the app for current tiers.

What are alternatives to Grammarly and TopPDF?

Other tools in related categories include DeepL, QuillBot Paraphraser, LanguageTool, Image to Text, PDFgear.

Grammarly vs TopPDF — Traffic (58.87M vs 643), Pricing & Verdict

Open AI Tools

Grammarly vs TopPDF — Traffic (58.87M vs 643), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	Grammarly	TopPDF
Official Domain	grammarly.com	toppdf.co
Pricing Model	Freemium	Freemium
Monthly Visits	58.87M (58,867,412)	643 (643)
MoM Traffic Delta	-916.08K (-1.5%)	-6.17K (-90.6%)
Primary Market & Share	🇺🇸 United States (51.9%)	🌐 Global (—)
Direct Visits / mo	25.4M	230
User Rating	4.4	3.9
Supported Platforms	Website	Website

Grammarly

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.