Sider integrates an all-in-one AI sidebar, chat, and knowledge workspace across browser, desktop, and mobile with support for every major model.
Sider started as a beloved browser sidebar and grew into a cross-device AI workspace. Its extension provides ChatGPT-style chat with page context, selection tools for instant translation and explanation, and group-chat mode that puts several models in one conversation to compare answers. The desktop and mobile apps extend this into a knowledge workspace where you collect documents, images, and links into folders and converse with them as retrieval collections. Sider supports an unusually wide model lineup including Chinese providers, and its prompt toolbox covers writing, coding, and study workflows. The interface is polished and fast, and generous free quotas have made it one of the most installed AI extensions worldwide. Its retrieval collections support OCR for images and screenshots, and the platform has built a large user community that shares prompt recipes and workflow templates inside the app. Its free quota is generous enough for full-time study, and paid tiers remain modestly priced compared with maintaining separate subscriptions for several chat products.
A generous free tier covers daily essentials. Premium subscriptions raise quota limits, enable unlimited advanced model access, and expand cloud knowledge storage, with team plans available.
Multilingual students and professionals who want one AI companion across browser, desktop, and mobile, and users who value comparing several models side by side in a single conversation. It is a strong fit for learners and researchers who collect material across devices and want a single, multilingual assistant that follows them everywhere.