Sider is an AI assistant that lives in your browser sidebar. Review sites describe access to 30 or more AI models, a Deep Research Agent, a Browser Agent for automation, ChatPDF analysis, YouTube summaries and REC Notes transcription. Its Chrome and Edge extensions are on the free plan, and the Safari extension needs a paid plan, according to one review. Softwares.com says it was founded in 2022 and is based in Singapore.

A free plan gives limited daily credits for lightweight models. Paid plans differ across sources: Tekpon lists Basic at $10, Pro at $20 and Unlimited at $40 per month, aiproductivity lists Basic $10, Plus $40 and Ultra $200, and others list entry prices from about $4.20. Zemith warns that even on Unlimited plans, advanced credits are capped, annual plans are pushed and refunds are restricted. Treat this as one reviewer’s view and read the refund terms before paying.

Because a sidebar assistant can read the pages you have open, avoid using it on confidential or sensitive pages, and check its permissions and privacy policy. AI answers should be verified before use. This page is a summary based on public listings and the vendor’s own description, dated 2026-11-13. It was not tested hands-on, and details may have changed.