Overview
Sider is an AI browser extension that docks a sidebar onto every webpage, giving you instant access to more than 20 models — GPT-4o, Claude, Gemini, DeepSeek, Grok, and others — without opening a separate app or tab. Launched as a ChatGPT sidebar and now with over 10 million users across Chrome, Edge, Safari, and Arc, its pitch is consolidation: instead of maintaining separate subscriptions to several chat assistants, you get them all in one panel that travels with you as you read, write, and research online.
The core workflow is contextual. You can highlight text on any page and ask the AI to explain, summarize, translate, or rewrite it; upload a PDF or paste a link and chat with its contents; or capture a screenshot and have the model interpret it. A Group Chat mode sends one prompt to several models at once and shows their answers side by side, which is genuinely useful for fact-checking or weighing perspectives. Because the panel stays anchored to the browser, you never lose context by switching tabs — the single biggest reason users stick with it over a standalone chatbot.
Key Features
- Multi-model sidebar — Switch between GPT-4o, Claude, Gemini, DeepSeek, and 20+ others from one panel on any site.
- Read and research helpers — Summarize webpages and YouTube videos, chat with PDFs and links, and translate 50+ languages in one click.
- Writing assistant — Draft, edit, and improve text directly inside web forms, email composers, and docs.
- Group Chat — Send the same prompt to multiple models simultaneously and compare responses side by side.
- AI image generation and editing — Generate and touch up images with a built-in Painter and 100+ specialized sidekick agents.
- Cross-platform — Available on Chrome, Edge, Safari, Arc, plus macOS, Windows, iOS, and Android.
Pricing
| Plan | Price | What’s included |
|---|---|---|
| Free | $0 | 30 basic credits/day, base models, page and YouTube summaries |
| Basic | $8.30/mo | 3,600 basic + 100 advanced credits/mo, full feature access |
| Pro | $16.60/mo | 12,000 basic + 300 advanced credits/mo, priority models |
| Unlimited | $25/mo | Unlimited basic and advanced credits, all features (annual ~20% off) |
Comparison
vs. Monica: Monica is the closest sibling — another multi-model browser sidebar with similar summarization and writing features. Sider has the larger user base and a slightly smoother summarizing interface, while Monica leans into more guided writing flows. Both are worth testing on their free tiers; the winner is mostly a matter of which sidebar UX you prefer.
vs. ChatGPT: ChatGPT is the deeper, more capable general assistant with Projects, Canvas, and custom GPTs, but it lives in its own app and pulls you out of the page. Sider wins on in-context speed — it is right where you are reading — whereas ChatGPT wins on raw capability and long-form work.
vs. Perplexity: Perplexity is the stronger cited research engine with verifiable sources, purpose-built for fact-finding. Sider is the better general-purpose companion for the mixed reading, writing, and translation tasks of an ordinary browsing day; reach for Perplexity when every claim must be traceable.