Vellum

Vellum, built by Vellum AI, has repositioned itself from an LLM development platform into a personal AI assistant. It is designed to remember how a person works, learn their preferences over time, and take real actions across the tools they already use — including browsing the web, managing files, running code, and handling calendar tasks. Its memory system has three layers: workspace files, a curated personal knowledge base, and an auto-extracted long-term memory layer that scores confidence and reinforces recurring patterns over time. Vellum is given its own identity within a user's workflow, complete with a dedicated email address, GitHub account, and Slack handle, and it can run background tasks unattended. The company states it does not train its models on user conversations, and that data remains exportable and deletable. The assistant is available on web, macOS, and iOS, as well as through the command line, email, Telegram, and Slack, and its runtime is MIT-licensed, so it can run on Vellum's cloud or be self-hosted locally. It targets knowledge workers looking for an AI assistant that integrates deeply with existing productivity tools rather than living in a single chat window.