Alternatives to SwarmTrace

Arize Phoenix is open-source LLM observability and evals that trace every agent step so you can ship reliable AI agents.

OpenTelemetry-native observability with an AI SRE that investigates incidents and opens fix PRs.

Open-source tracing, evaluation, and prompt iteration for AI agents — self-host it on your own infrastructure with no per-span bill.

Silico is Goodfire's interpretability agent for understanding, debugging, and controlling the internals of your AI models

Open-source LLM observability, prompt management, and evaluation for teams running AI agents in production.

LangSmith is an AI agent observability platform for tracing, monitoring, and evaluating LLM apps and long-running agents.

Open-source LLMOps platform for simulating, evaluating, and observing agentic AI before production.

AI observability and eval-engineering platform that turns offline evals into live production guardrails.

Arena AI is a free, community-voted LLM leaderboard ranking chat models, agents, and fullstack code on live head-to-head battles.

Opik, Comet's open-source LLM observability and eval platform, turns agent traces into root-cause groupings and git-committed code fixes

Open-source OpenTelemetry observability for Python LLM apps

Enterprise LLM evaluation, observability, and AI red teaming that standardizes quality across every team.

Open-source, OpenTelemetry-native agent evaluation and tracing that finds where your agent fails.

MLflow is the open source AI engineering platform for agent and LLM observability, evaluation, and prompt management.

Track, forecast, and optimize AI spend across OpenAI, Google AI, Azure, and Bedrock.

LangChain's agent platform: build agents with LangGraph and deepagents, then trace, evaluate and deploy them in LangSmith.

Agent evaluation and simulation platform that catches hallucinations before they reach production

Discontinued: WhyLabs ceased operations in 2025 and open-sourced its platform; whylogs and langkit live on as open source.

Collaborative LLM development platform for prompt management, evaluation, and production monitoring

Fiddler AI is an enterprise AI control plane for agent observability, guardrails, and governance across the agentic lifecycle.

Open-source workspace for building, evaluating, and deploying AI agents you talk to in Slack, Telegram, or a browser chat

Mastra is an open-source TypeScript agent framework for building durable AI agents and workflows that run for days.

Lyzr is the agent control plane for governing, simulating, and deploying enterprise AI agents from PoC to production.

Maxim AI simulates, evaluates, and observes AI agents in one workspace, with an open-source gateway (Bifrost) for routing and governance.

Honeycomb's natural-language query layer that turns plain-English questions into HQL against your live telemetry.

Weights & Biases tracks ML experiments and traces LLM apps so teams can ship AI models faster

PostHog is an all-in-one product platform: analytics, session replay, error tracking, feature flags, experiments, surveys, and a managed data warehouse with a

LLM gateway with built-in tracing, observability, and automated evals on one endpoint

Prompt management and team collaboration for ChatGPT, Claude, and Gemini prompts in one workspace.

Open-source framework to replace vibe checks with reproducible, LLM-driven evaluation loops for RAG and agents.