A personal assistant you shape: you set the personality, supply the context, and it keeps a memory of people and preferences across years. Routines and heartbeats let it work while you are away and message you with what matters. It is reachable on the web, macOS, iOS, Slack and Telegram.
It names eight model providers, which is more than double the next longest list in this directory: Anthropic, OpenAI, Google, Fireworks AI, Baseten, Atlas Cloud, Together AI and ElevenLabs, each with a link to its own privacy notice. It also lets you bring your own key, and says plainly what that changes: your data goes straight to that provider under your relationship with them rather than under Vellum's.
The training answer is a no with a switch. Data is used to evaluate and improve the systems that power Vellum and not to train models, and the collection itself can be turned off during onboarding or in settings.
On 11 September 2026 it added payments, and its documentation says how, which is rarer than the feature. The assistant pays through Stripe's Link wallet: you name a ceiling, it drafts a spend request naming the merchant, the amount and what for, you approve in the Link app, Link issues a single-use virtual card for that amount, and the assistant completes the checkout without ever seeing your saved cards. The launch thread shows an office assistant ordering a $32.19 lunch and the approval card it produced. It is the third listing here to name Stripe Link, and the first whose docs describe the approval step to the field.
The operating company is Vocify, Inc., which appears nowhere on the product pages. Worth stating for anyone checking our record: an enterprise platform for building and evaluating LLM applications also trades as Vellum, and a search for the name mostly returns that company rather than this one. The two are different companies.