Vellum alternatives
6 agents tools in the same lane as Vellum, ranked by editorial score.
KH
Khoj
Agents · Multi-model
7.9
Open-source personal AI that builds agents, searches your documents, and automates research across local files and the web.
Freemium· Free self-hosted; paid cloud tier on app.khoj.devpersonal-knowledge-baseagent-building
GB
GPT Builder
Agents · OpenAI GPT-4o / GPT-5 (plan-dependent)
6.9
OpenAI's no-code editor for spinning up custom ChatGPT agents with instructions, knowledge files, and tool calls.
Paid· Basic: $10 · Standard: $20 · Premium: $30custom-chatbotsinternal-assistants
CO
Composio
Agents · Model-agnostic (works with Claude, GPT-4o, Gemini, Llama, and other frontier and open-weights models via SDK integrations)
Auth, tools, and sandboxed execution for AI agents across 1,000+ apps
Freemium· Totally Free: $0 · Ridiculously Cheap: $29 · Serious Business: $229Customer support agent triaging Gmail and filing Linear ticketsSales agent updating HubSpot and posting to Slack
HA
Hermes Agent
Agents · Multi-model (300+ via Nous Portal)
8.2
Open-source multi-channel AI agent with persistent memory, scheduling, and subagent delegation from Nous Research.
Freemium· MIT-licensed self-host free; managed Portal tiers Free/Plus/Super/Ultra with creditspersonal-assistanttask-automation
AT
Atua
Agents · Multi-model (BYO key)
7.9
Keyboard-summoned macOS AI assistant that reads your screen and drives system apps with your own API keys.
Paid· One-time $29, lifetime updates, 7-day refundmacos-assistantscreen-context
RA
Relevance AI
Agents · Multi-model: Claude (Opus/Sonnet/Haiku), OpenAI GPT, Google Gemini, plus open-weight options (Kimi K2, GLM)
Build and deploy an AI workforce of specialized agents across your business tools
Enterprise· Free trial available via the app. Paid tiers are quote-based (Enterprise): custom actions, unlimited agents/tools/users, dedicated account manager. Reported customer benchmarks cite an average cost of ~$0.09 per task at scale; no fixed public tier pricing.Outbound prospect research and personalisationMeeting prep and CRM hygiene