# Sider

**Source:** https://geo.sig.ai/brands/sider  
**Vertical:** Productivity & Collaboration  
**Subcategory:** AI Browser Assistant  
**Tier:** Challenger  
**Website:** sider.ai  
**Last Updated:** 2026-04-14

## Summary

Bootstrapped AI browser extension with 6M+ users aggregating 20+ AI models (GPT-4o, Claude, Gemini). 2025 Chrome Editor's Pick. Founded 2023, Boston. No funding.

## Company Overview

Sider is a bootstrapped AI browser assistant founded in 2023 by Joel Liu and Rick Fan, headquartered in Boston. It has grown to 6M+ users without external funding, making it one of the most notable self-funded AI tool successes. Named a 2025 Chrome Editor's Pick.

The core product is a browser extension adding a universal AI sidebar on every webpage, with access to 20+ AI models including GPT-4o, Claude 3.5 Sonnet, and Gemini. Users can search, compose, translate, summarize, and perform deep research directly within their browser. Works on Chrome, Edge, and Chromium browsers.

Sider differentiates by aggregating multiple frontier models into a single interface rather than building proprietary models. Users switch between providers depending on the task. Features include image-to-text, email drafting, and a deep research agent.

## Frequently Asked Questions

### What is Sider AI?
A browser extension adding a universal AI sidebar with access to 20+ models (GPT-4o, Claude, Gemini) for writing, translation, summarization, and research.

### Is Sider funded?
No, fully bootstrapped since 2023 by Joel Liu and Rick Fan. Grown to 6M+ users without external funding.

### What browsers does Sider support?
Chrome, Edge, and Chromium-based browsers. Named a 2025 Chrome Editor's Pick.

### What AI models does Sider include?
20+ models including OpenAI's GPT-4o, Anthropic's Claude 3.5 Sonnet, and Google's Gemini.

### What can you do with Sider?
Web search, writing, translation, page summarization, image-to-text, email drafting, and deep research — all from a sidebar.

### What is Sider and what AI capabilities does it provide?
Sider is an AI assistant browser extension and sidebar tool that gives users access to multiple AI models including GPT-4, Claude, and Gemini alongside any web content — allowing users to ask questions about web pages, summarise articles, translate content, explain selected text, and generate writing without switching browser tabs or opening separate AI chat interfaces.

### What reading and research features does Sider provide?
Sider can summarise any web page, PDF, or YouTube video, explain technical concepts from selected text in plain language, translate content into multiple languages, and compare information from multiple sources — making it useful for researchers, students, and professionals who read large volumes of online content and want AI assistance for comprehension and synthesis without leaving the page they are reading.

### How does Sider differ from using AI chatbots directly?
Sider brings multiple AI models into the browser sidebar alongside any web content so users can reference the source material while interacting with AI — unlike opening a separate AI chat tab where the user must copy and paste content, Sider can read the current page automatically and provide contextual assistance without manual copying, with the ability to switch between AI models to compare responses.

## Tags

b2b, productivity, saas, collaboration

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*Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*