Thinkbeside

Thinkbeside is a browser extension that connects multiple artificial intelligence models to any webpage for reading and writing help.

Thinkbeside is an AI sidebar for Chrome that connects GPT, Claude, Gemini, DeepSeek and Grok directly to the webpage you are working on. It allows you to ask questions about webpages, chat with PDFs and Word documents, summarize YouTube videos, and compare AI answers side by side. Users can attach up to six open tabs, highlight text for explanation or translation, and use an AI writing assistant to improve drafts. The tool works with your own API keys, meaning you pay your selected provider directly for usage. It is built for students, researchers, writers, and professionals who want to work with AI without switching between tabs.

Thinkbeside at a glance

Best for: Software engineer, Product manager, Researcher
Runs on: Chrome extension
Pricing: Free to install; requires your own provider API keys and direct usage billing
Released: October 2026
Category: AI chat assistant
Website: Chrome Web Store

Key features

Chat with webpages and research pages
Ask about selected text in paragraphs
Chat with PDFs and Word documents
Summarize YouTube videos using transcripts
Bring several sources into one question
Compare AI answers side by side
Improve drafts with a writing assistant
Save and reuse favorite prompts

Use it for

Explaining difficult reading material for students
Combining information from multiple research sources
Refining drafts and paraphrasing passages
Understanding documents and preparing messages

Companions

Tools that articles about Thinkbeside recommend using with it, each with its job.

Claude — Built to work with Claude.
Gemini — Built to work with Gemini.
DeepSeek — Built to work with DeepSeek.
Composio — Equips AI agents with tools, managed user auth, and sandboxes across 1,500+ apps
Make — Runs and manages Make scenarios from a conversation.
Canva — Templates for almost any design, plus AI editing in one tool

Alternatives to Thinkbeside

Page Assist — Interact directly with local AI models on any webpage via a sidebar and web UI.
Sider — Chat and automate tasks across websites using leading AI models.
Best Prompt Generator Extension — Applies prompt engineering frameworks to improve AI output automatically.
Panelize — Compare multiple AI models at once without setting up API keys.
5ire — It supports local knowledge base management and Model Context Protocol servers.
AI Export Tools — Exports complete conversation histories, media, and files across multiple AI platforms.
Open WebUI — Run AI on your own terms with complete data privacy and self-hosting control.
GPT AI Assistant — Connects OpenAI models directly to the LINE mobile messaging app.
Pi Optchat — It provides endless chat per profile with persistent memory and background subagents.
Chat Brawlers — Three different models debate questions and reach consensus.
The Gatekeeper — Runs entirely offline within a web browser for immediate text interaction.
Tabbit — AI browser with many model choices and data kept on the device

All Thinkbeside alternatives