Onhand

Chatbots pull you off the page and hand back an answer that's often ungrounded in the source you gave them. Onhand, a Chrome extension, stays in the material while answering questions, highlighting the line, leaving a note in the margin, and explaining it on the page you're already reading. Learning mode guides you to the answer instead of just revealing it, and voice lets you ask follow-ups in real-time. Onhand is for students, researchers, and deep readers. It's free to use and open-source.