Arize AI records 249,028 monthly visits with +3.2% month-over-month growth and Paid, Contact for Pricing pricing. Vellum records 331,901 monthly visits with -20.8% growth and Freemium, Paid pricing.
Agent observability, evaluation, and continuous improvement for production AI
A private, memory-powered AI assistant you own and customize
| Dimension / Metric | | |
|---|---|---|
| Official Domain | arize.com | vellum.ai |
| Pricing Model | Paid, Contact for Pricing | Freemium, Paid |
| Monthly Visits | 249.03K (249,028) | 331.9K (331,901) |
| MoM Traffic Delta | +7.67K (+3.2%) | -86.97K (-20.8%) |
| Primary Market & Share | 🇺🇸 United States (51.6%) | 🇺🇸 United States (31.3%) |
| Direct Visits / mo | 107.84K | 70.21K |
| User Rating | 4.6 | 4.2 |
| Supported Platforms | Website | Website |
Agent observability, evaluation, and continuous improvement for production AI
Capture spans, traces, and sessions across agents and LLM calls using OpenInference conventions built on OpenTelemetry, so instrumentation stays portable.
Run evaluations at span, trace, and session level to grade retrieval quality, tool use, and final answers across large production datasets.
An in-product agent that inspects traces, diagnoses likely root causes, and proposes fixes that engineers can review before shipping.
Self-host the leading open-source tracing and eval tool when you need to keep trace data inside your own infrastructure.
A private, memory-powered AI assistant you own and customize
A custom-built memory system that retains you, your people, preferences and work across every conversation, rather than resetting each session.
Connect Google Workspace, Slack, Notion, your filesystem and community plugins so the assistant can send emails, manage calendars, browse, create slides and run research.
Set permissions so sensitive actions like emailing new contacts or modifying key files require approval until you mark them trusted.
Switch between OpenAI, Anthropic, Gemini or open-weight models via Ollama at any time, keeping you free of a single vendor lock-in.
Free / Open-sourceServes as a lightweight backend runtime for running local models, but requires a separate UI or client app.
Free / Open-sourceServes as a lightweight backend runtime for running local models, but requires a separate UI or client app.
SpecialistExcels at node-based workflow automation and agent orchestration, but is less focused on conversational assistant interactions.
SpecialistExcels at node-based workflow automation and agent orchestration, but is less focused on conversational assistant interactions.
Free / Open-sourceOffers autonomous personal agent capabilities with persistent memory, but requires more technical setup than Vellum.
Free / Open-sourceOffers autonomous personal agent capabilities with persistent memory, but requires more technical setup than Vellum.
Free / Open-sourceConnects local models directly to messaging apps for task automation, but lacks Vellum's polished desktop assistant interface.
Free / Open-sourceConnects local models directly to messaging apps for task automation, but lacks Vellum's polished desktop assistant interface.
Free / Open-sourceProvides visual workflow building and RAG pipelines, but is structured more as a developer platform than a personal assistant.
Free / Open-sourceProvides visual workflow building and RAG pipelines, but is structured more as a developer platform than a personal assistant.
Free / Open-sourceProvides a feature-rich self-hosted chat interface for local models, but lacks native background workflow automation.
Free / Open-sourceProvides a feature-rich self-hosted chat interface for local models, but lacks native background workflow automation.
Free / Open-sourceFocuses heavily on local document RAG and privacy-first chat, whereas Vellum emphasizes broader assistant workflows.
Free / Open-sourceFocuses heavily on local document RAG and privacy-first chat, whereas Vellum emphasizes broader assistant workflows.
Excels at experiment tracking and model registry workflows, but is less purpose-built for real-time LLM production observability.
Excels at experiment tracking and model registry workflows, but is less purpose-built for real-time LLM production observability.
Free / Open-sourceProvides a streamlined desktop app for running local models, but lacks advanced agent memory and workflow integrations.
Free / Open-sourceProvides a streamlined desktop app for running local models, but lacks advanced agent memory and workflow integrations.
SpecialistCombines visual workflow builders with AI agent connectors, but lacks native local model management out of the box.
SpecialistCombines visual workflow builders with AI agent connectors, but lacks native local model management out of the box.
Free / Open-sourceIncludes integrated guardrails and simulation tools, but is less mature for large-scale enterprise production telemetry monitoring.
Free / Open-sourceIncludes integrated guardrails and simulation tools, but is less mature for large-scale enterprise production telemetry monitoring.
Free / Open-sourceFeatures strong testing and prompt evaluation tools, though its monitoring interface is less oriented towards massive telemetry streams.
Free / Open-sourceFeatures strong testing and prompt evaluation tools, though its monitoring interface is less oriented towards massive telemetry streams.
