Grammarly records 58,867,412 monthly visits with -1.5% month-over-month growth and Freemium pricing. Sider records 2,644,740 monthly visits with -10.6% growth and Freemium 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 Sider
Grammarly has 58,867,412 monthly visits, while Sider has 2,644,740. 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.
Sider
AI sidebar and browser agent for reading, writing and research
AI sidebar on any page
A persistent panel that reads the page you are on and answers follow-ups with GPT, Claude or Gemini without copying content into another tab.
Summarise and chat with documents
Summarise long articles, PDFs and YouTube videos, extract key points, and ask detailed questions about the source material.
Translation and read-aloud
Translate webpages, PDFs and images, compare bilingual output side by side, and have content read aloud for review on the move.
Sider Hand browser agent
Delegate multi-step tasks across real websites — price comparison, form filling, research and inbox triage — using your existing logged-in sessions.
Strengths & Pros
+Works inside the browser you already use, with no context switching
+Access to multiple frontier models from one subscription
+Strong reading toolkit: PDF chat, YouTube summaries, translation and read-aloud
+Increasingly capable agent features for multi-step browser tasks
Limitations
–Useful credits run out quickly on the free and lower tiers
–Model availability and quota rules change over time, so expectations must be checked per plan
–Some agent and code features depend on a cloud machine and heavier plans
