Sider records 2,644,740 monthly visits with -10.6% month-over-month growth and Freemium pricing. WebFill records 2,044 monthly visits with -12.5% growth and Freemium pricing.
AI sidebar and browser agent for reading, writing and research
AI browser extension for form filling, email drafting and data entry
| Dimension / Metric | ||
|---|---|---|
| Official Domain | sider.ai | webfill.co |
| Pricing Model | Freemium | Freemium |
| Monthly Visits | 2.64M (2,644,740) | 2.04K (2,044) |
| MoM Traffic Delta | -314.2K (-10.6%) | -293 (-12.5%) |
| Primary Market & Share | 🇺🇸 United States (13.3%) | 🌐 Global (—) |
| Direct Visits / mo | 1.7M | 805 |
| 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.
AI browser extension for form filling, email drafting and data entry
WebFill detects fields on a page and completes forms, surveys and data-entry screens automatically, learning per-site instructions over time.
WebFill Vision captures any part of your screen and returns answers, aimed at multiple-choice questions, online assessments and on-screen content.
Generate or reply to emails straight from your inbox by pressing the WebFill button and letting the AI draft the response.
Upload a PDF or paste text and let WebFill handle repetitive data entry, MCQ solving and survey completion with saved instructions per website.
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.
All-in-one AI assistant across web, browser, desktop and mobile
All-in-one AI assistant across web, browser, desktop and mobile
Build powerful forms, surveys and quizzes with AI in minutes
Your AI agent for the browser: chat, automate and create from one sidebar
Your AI agent for the browser: chat, automate and create from one sidebar
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.
Build forms, surveys and quizzes in seconds — with unlimited free responses
One browser agent that combines every major AI model with web automation
AI writing assistant with autocomplete, research, and a Chrome extension
AI writing assistant with autocomplete, research, and a Chrome extension
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
Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.
Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.
Delivers streamlined inline writing and webpage summarization via a browser extension, but with fewer custom sidebar tools.
Delivers streamlined inline writing and webpage summarization via a browser extension, but with fewer custom sidebar tools.
