Sider records 2,644,740 monthly visits with -10.6% month-over-month growth and Freemium pricing. Write Brain records 0 monthly visits with 0% growth and Freemium pricing.
AI sidebar and browser agent for reading, writing and research
One-click grammar, clarity, tone, and translation wherever you type on the web
| Dimension / Metric | ||
|---|---|---|
| Official Domain | sider.ai | writebrain.io |
| Pricing Model | Freemium | Freemium |
| Monthly Visits | 2.64M (2,644,740) | 0 (0) |
| MoM Traffic Delta | -314.2K (-10.6%) | 0 (0%) |
| Primary Market & Share | 🇺🇸 United States (13.3%) | 🌐 Global (—) |
| Direct Visits / mo | 1.7M | 0 |
| User Rating | 4.5 | 4.1 |
| Supported Platforms | Website | Website |
AI sidebar and browser agent for reading, writing and research
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 long articles, PDFs and YouTube videos, extract key points, and ask detailed questions about the source material.
Translate webpages, PDFs and images, compare bilingual output side by side, and have content read aloud for review on the move.
Delegate multi-step tasks across real websites — price comparison, form filling, research and inbox triage — using your existing logged-in sessions.
One-click grammar, clarity, tone, and translation wherever you type on the web
Automatically spot and correct typos and grammar slips in any text field and fix them with a single click before you send.
Strip out verbose corporate phrasing and unnecessary words to turn rambling drafts into clear, direct messages.
Turn a rough outline into richer, more descriptive prose with quick suggestions on how to phrase your point better.
Translate text in place, so you can read foreign-language comments or reply to customers in their own language.
SpecialistOpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.
SpecialistOpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.
SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.
SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.
Cross-platform AI writing assistant delivering real-time grammar correction, tone alignment, authorship tracking, and team style guides.
Cross-platform AI writing assistant delivering real-time grammar correction, tone alignment, authorship tracking, and team style guides.
Paraphrase, proofread and summarize text with an AI writing workspace
Paraphrase, proofread and summarize text with an AI writing workspace
AI grammar, spelling and style checker for 30+ languages
AI grammar, spelling and style checker for 30+ languages
Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools.
Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools.
Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features.
Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features.
Excels at advanced web automation and data extraction alongside chat, but has a steeper learning curve than Sider.
Express yourself with confidence — rewrite, proofread and summarize in one click
Express yourself with confidence — rewrite, proofread and summarize in one click
AI writing assistant with autocomplete, research, and a Chrome extension
AI writing assistant with autocomplete, research, and a Chrome extension
AI grammar checker and writing assistant for teams and professionals
AI grammar checker and writing assistant for teams and professionals
Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser
Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser
