Build stateful AI agents that retain memory across sessions, with a web app, CLI workflow, and developer API.
Best for: Letta suits builders who need an agent to maintain context beyond one conversation.
About this listing
Product and access model reviewed from current official sources; workflow and example are editorial suggestions, not a hands-on test.
Official sourceA personal AI assistant with persistent memory, connected tools, scheduled work, and hosted or self-hosted operation.
Best suited to
Vellum's current offering is a personal assistant that can retain preferences and perform tasks across connected tools.
Vellum's current offering is a personal assistant that can retain preferences and perform tasks across connected tools. It suits users who want continuity between conversations and repeated work. Start with a read-only task before enabling actions. Memory can retain an incorrect assumption as well as a useful fact, so inspect important context and set clear permission boundaries for messages, bookings and other outside changes.
This example describes a task, not a tested output. Adjust the source material and settings to your own situation.
Prepare a private daily brief from these authorized sources, separating confirmed commitments from tentative ideas and taking no external action.
Result check: Check source freshness, remembered preferences and that no unapproved change or communication occurred.
The assistant has an MIT-licensed self-hosted codebase and paid managed plans. Free software does not include free infrastructure or model inference; hosted tiers also differ in compute, storage and usage. Confirm provider credentials, deployment maintenance and the currently supported client build before installing or subscribing.
Choose another workflow when its emphasis fits better: Letta for another stateful-agent approach; Lindy for a different connected-assistant workflow.
Persistent assistant memory
Connected application tools
Scheduled and proactive tasks
Cross-device conversations
Hosted or self-hosted runtime
The assistant has an MIT-licensed self-hosted codebase and paid managed plans. Free software does not include free infrastructure or model inference; hosted tiers also differ in compute, storage and usage. Confirm provider credentials, deployment maintenance and the currently supported client build before installing or subscribing.
Plan information can change. Prices and conditions are set by the provider. Information checked 2026-10-15.
Source for access detailsOne email a week: new free AI tools, prompts and free-plan changes. No spam, unsubscribe any time.
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Vellum's current offering is a personal assistant that can retain preferences and perform tasks across connected tools. It suits users who want continuity between conversations and repeated work. Start with a read-only task before enabling actions. Memory can retain an incorrect assumption as well as a useful fact, so inspect important context and set clear permission boundaries for messages, bookings and other outside changes.
The assistant has an MIT-licensed self-hosted codebase and paid managed plans. Free software does not include free infrastructure or model inference; hosted tiers also differ in compute, storage and usage. Confirm provider credentials, deployment maintenance and the currently supported client build before installing or subscribing.
Choose hosted access or review self-hosting requirements. Configure permitted sources and action boundaries.
Check source freshness, remembered preferences and that no unapproved change or communication occurred.
Letta for another stateful-agent approach; Lindy for a different connected-assistant workflow.
Tell us what needs improving. No account or private output required.
Report incorrect information or a broken linkDocumentation-based review · 2026-10-15
Reviewed from the linked official documentation. The workflow and example are editorial suggestions; no account-level product test or measured performance comparison was performed.
Prompt
Prompt
Prompt
Learn AI
Learn AI
Build stateful AI agents that retain memory across sessions, with a web app, CLI workflow, and developer API.
Best for: Letta suits builders who need an agent to maintain context beyond one conversation.
AI teammate for connected company tasks, including research, email, meetings, CRM updates, and computer-based work.
Best for: Connected app tasks and Research
A free desktop app where several AI bots chat in one group, each using your own model and API key, with chats and files kept on your computer.
Best for: Teebots is a free local AI assistant for macOS, Windows and Linux.