Best Alternatives to Arize Phoenix

Open-source LLM observability — traces, evaluations, experiments, prompt tracking in a single dashboard. Compare 10 similar free AI tools.

1. Langfuse — Framework-agnostic LLM tracing — generous free tier, European privacy (Free: Free self-host; cloud free tier)
2. DeepEval — 30+ metrics + red teaming 40+ vulnerabilities (Free: Apache 2.0)
3. Ollama — Run 100+ LLMs locally from the terminal — completely free (Free: Free; 100+ models locally)
4. Activepieces — Open-source Zapier alternative — self-hostable, 200+ integrations, AI-powered automation builder (Free: Open source; free self-hosted; cloud free tier with 1,000 tasks/month)
5. LangGraph 1.0 — Production-grade directed graph agent orchestration — checkpointing, human-in-loop, streaming, LangSmith integration (Free: MIT license; fully open source)
6. LangGraph — Directed graph agent workflows — SQLite checkpointers for persistence, human-in-loop interrupts, 13.9K stars (Free: MIT; 34.5M+ downloads/month)
7. Lovable — AI app builder focused on beautiful UI/UX — Supabase integration, GitHub sync, one-click deploy (Free: Free tier with limited monthly generations)
8. BentoML / OpenLLM — Deploy AI apps at scale (Free: Free OSS + cloud credits)
9. lm-eval-harness — 60+ benchmarks — powers the Open LLM Leaderboard (Free: MIT)
10. Obsidian Copilot — Vault-wide RAG inside Obsidian — 50+ LLM providers (Free: Free plugin; bring your API key)

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