Alternatives to Phoenix

Arize Phoenix is open-source LLM observability: trace agent steps, run evals, and self-host your traces.

LangSmith is agent and LLM observability: trace, monitor, and evaluate AI agents in cloud, BYOC, or self-hosted.

Open-source LLM observability and agent evals: trace, evaluate, and improve production AI agents with MIT-licensed tooling.

OpenLIT is an open-source, OpenTelemetry-native agent harness engineering platform for LLM tracing, evals, and guardrails you self-host.

Open source AI engineering platform for agent and LLM tracing, evaluation, prompt management, and ML lifecycle work.

Maxim AI evaluates, simulates and observes AI agents — with Bifrost, its open-source LLM gateway, handling routing, budgets and guardrails.

Open-source Python framework that replaces vibe checks with reproducible evaluation loops for RAG pipelines and AI agents.

Open-source AI observability for agent tracing, LLM-as-a-judge evals, and coding-agent cost tracking.

Developer observability platform that traces, replays, and debugs AI agent runs across OpenAI, CrewAI, Autogen and 400+ LLMs

Open-source agent observability that auto-captures every LLM and tool call and flags failures you never wrote a detector for.

OpenJudge is an Apache 2.0 open-source AI evaluation framework shipping 50+ benchmark-validated graders for agents, LLMs, code, math, and multimodal models.

Dash0 is OpenTelemetry-native observability where Agent0 investigates incidents, finds root cause, and opens fix PRs.

TruLens traces AI agent runs with OpenTelemetry-native evals, showing where an agent fails and where you can cut cost.

Open-source AI coworker workspace that builds, schedules and ships agents to Slack or Telegram

Evidently AI is an open-source Python framework for LLM evaluation, RAG testing, and ML model monitoring under Apache 2.0.

Braintrust is an agent observability platform that traces AI runs, scores quality with evals, and surfaces production failure patterns.

Metoro is a Kubernetes observability and AI SRE agent that watches your cluster with eBPF and opens fix PRs for production issues.

Free open-source AI usage tracking and analytics that syncs your token and cost data from Claude, Cursor, ChatGPT and other tools onto a shareable dashboard.

PandaProbe is open-source agent observability that traces runs, evaluates outcomes, and turns failures into validated fixes via its Repair

LangWatch is an open-source LLMOps platform for agent testing, LLM evaluation and OpenTelemetry-native LLM observability.

Galileo AI Evals turns offline evaluations into production guardrails that gate your AI agents in real time.

Opik by Comet turns LLM traces into root-cause groupings, eval scores and code fixes so agent teams stop shipping the same bug twice

Open-source OpenTelemetry tracing, versioning, and sessions for Python LLM apps—bring your own backend.

LLM evaluation, observability, and red teaming in one workspace — ship AI you can actually trust

Athina AI is a collaborative AI development platform for managing prompts, running LLM evaluations, and monitoring production traces in one

Fiddler AI is an enterprise AI control plane for agent observability, inline guardrails, and auditable AI governance.

Galileo is an AI observability and eval engineering platform that turns offline evals into production guardrails for agents and RAG.

Open-source LLM observability, evaluation, and cost tracking for teams shipping agentic AI

OpenCompass (司南) benchmarks LLMs, VLMs, and AI4S models on 100+ open evaluation datasets with dated leaderboards

Raindrop traces, detects, and simulates fixes for silent AI agent failures in production before they reach your users.