Sider

Sider is a browser extension that adds an AI-powered sidebar to every webpage you visit. After installing it on Chrome, Edge, or Safari, you can open the sidebar on any page to chat with AI models like GPT-4o, Claude, Gemini, and DeepSeek. You can highlight text on a page and ask the AI to explain, translate, summarize, or rewrite it — all without leaving the page you are on.

Sider offers four tiers: Free (30 basic credits/day with basic models), Basic at $8.30/mo (3,600 basic + 100 advanced credits), Pro at $16.60/mo (12,000 basic + 300 advanced credits), and Unlimited at $25/mo (unlimited basic + advanced credits with 1,000+ premium model queries guaranteed). Annual billing saves roughly 20% on all paid plans.

Yes, Sider has a free plan that gives you 30 basic credits per day. This lets you use entry-level models like GPT-4o mini, Claude Haiku, and Gemini Flash. It is enough for occasional lookups and quick translations, but the daily limit resets each day and is too low for consistent daily work or use of premium models.

Sider provides access to 20+ AI models across providers. These include OpenAI models (GPT-4o, GPT-4o mini), Anthropic models (Claude Sonnet, Claude Haiku), Google models (Gemini Pro, Gemini Flash), plus DeepSeek, Grok, and others. The specific models available depend on your plan tier — the free plan only accesses basic models, while paid plans unlock premium models like GPT-4o and Claude Sonnet.

Sider uses a credit-based pricing model. Each AI query consumes a certain number of credits depending on the model used. Basic models (GPT-4o mini, Haiku) cost fewer credits per query, while premium models (GPT-4o, Claude Sonnet) cost more. Credits are divided into Basic, Advanced, and Elite tiers. Unused credits expire at the end of each billing month and do not roll over to the next month.

Sider's Unlimited plan at $25/mo is comparable to ChatGPT Plus ($20/mo), but Sider gives you access to multiple AI models (GPT-4o, Claude, Gemini) instead of just ChatGPT. If you would otherwise subscribe to both ChatGPT Plus and Claude Pro ($20/mo each), Sider can save you money. However, you get less depth per model — ChatGPT Plus offers features like DALL-E, GPTs, and voice mode that Sider does not.

Yes. Sider includes a PDF and document chat feature where you can upload PDF files and ask questions about their contents. The AI can summarize the document, extract key points, answer specific questions, and even translate sections. It works with most standard PDF files but may struggle with heavily formatted or image-based PDFs.

Group Chat lets you send the same prompt to multiple AI models simultaneously and compare their responses side by side. For example, you can ask a question to GPT-4o, Claude, and Gemini at once and see how each model answers. This is useful for fact-checking, getting diverse perspectives, or finding the best response for a specific task.

Sider is primarily a desktop browser extension for Chrome, Edge, and Safari. There is no standalone mobile app, but you can use the Sider web app at sider.ai on mobile browsers. The full sidebar experience is designed for desktop use where you need AI alongside your workflow.

Sider routes your queries through the official APIs of each AI provider (OpenAI, Anthropic, Google). The extension requires broad browser permissions to function on all pages, which some security-conscious users may find concerning. Sider states in its privacy policy that it does not sell user data. For sensitive work, be aware that your queries pass through Sider's servers before reaching the AI providers.