Heym vs Vellum

Heym is infrastructure for building, running, and governing AI agents and workflows in production. Workflows can be assembled on a visual canvas or described by text or voice for generation by its AI assistant. An orchestrator delegates to named sub-agents and sub-workflows across as many as five nesting levels. Retrieval supports managed Qdrant or built-in Postgres with pgvector, document uploads, semantic search, and optional Cohere reranking. Human-review checkpoints pause runs so a reviewer can accept, edit, or refuse before continuation. Execution traces record prompts, responses, tool calls, timing, and token use, with built-in evaluation features. Listed integrations include OpenAI, Anthropic, Google Gemini, Slack, Discord, Gmail, Outlook, GitHub, Jira, Telegram, Notion, Qdrant, Redis, RabbitMQ, Google Sheets, and MCP. Heym is self-hostable with Docker Compose or Kubernetes, and describes encrypted credentials plus JWT authentication.

Vellum is a personal AI assistant that can read files, manage calendars, send email, run code, and control a computer. It saves preferences and context in its workspace for later conversations, and users can create, install, and manage skills. Listed OAuth services include Discord, GitHub, Google services, HubSpot, Linear, Twitter (X), Asana, Notion, Microsoft Outlook, and Todoist. Vellum says OAuth tokens stay in a credential vault rather than being exposed to the language model. Sensitive actions prompt for approval, and users can set trust rules for standing permissions. By default, conversation context is sent to Anthropic to generate responses; OpenAI, Google, OpenRouter, Fireworks, and local Ollama are listed alternatives. An internet connection is required. Vellum Cloud runs assistants in isolated environments with private storage and 24/7 availability. The Free plan includes first tasks and pay-as-you-go credits. Mighty costs $30 a month, Super $100 a month, and Ultra $200 a month. There is no shipped Linux desktop client, but Linux users can use the web app, Chrome extension, or self-host the runtime.