20 Langfuse alternatives
Langfuse: Open-source LLM observability — trace, evaluate, and improve AI applications with production data. 20 apps do similar work, most sharing Developers, Evaluation and Open Source, ranked by how much they have in common with Langfuse.
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The framework and observability platform most teams use to build, debug, and ship LLM agents.
Also: Developers, Evaluation, Observability, Open Source, Python
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The standard experiment tracker for machine learning, now with tracing and evaluation for LLM applications.
Also: Evaluation, Observability, Python
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Arize AI
AI engineering platform for tracing, evaluating and improving LLM apps and agents — with Phoenix, its open-source local-first counterpart, for teams that want to start without a vendor.
Also: Evaluation, Observability, Open Source
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Evaluation-first AI development — measure whether a prompt or model change actually improved anything.
Also: Developers, Evaluation, Observability
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Prefactor Pty Ltd
Agent observability and evaluation that scores every production run for quality, drift and risk — and can pause or block a risky action before it executes.
Also: Developers, Evaluation, Observability
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Microsoft
Microsoft's open-source optimizer that trains an agent's SKILL.md like a model parameter — epochs, learning-rate budgets and a held-out validation gate, with frozen weights.
Also: Developers, Evaluation, Open Source
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Secure cloud sandboxes where AI agents can run untrusted code safely, starting in milliseconds.
Also: Developers, Open Source, Python
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The multi-agent framework where agents have roles and collaborate as a crew — plus a platform to run them in production.
Also: Developers, Open Source, Python
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LangGenius
An open-source platform for building production LLM applications — visual workflows, RAG, and agents in one place.
Also: Developers, Evaluation, Open Source
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Reads your production chat and voice agent conversations to surface the silent failures, frustration loops and policy breaches that offline evals never catch.
Also: Evaluation, Observability
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Vectify AI
A vectorless RAG engine that builds a tree index of long PDFs and lets an LLM reason its way to the right section, with page-level citations.
Also: Open Source, Python
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Abhishek Iyer
A local, keyboard-driven diff viewer built for the huge changes coding agents produce - and it remembers what you have already seen.
Also: Open Source, Python
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Open-source testing and evals platform for MCP servers — trace tool calls, debug OAuth, and catch cross-client regressions in CI.
Also: Evaluation, Open Source
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IBM (DataStax)
Open-source, MIT-licensed visual builder for AI agents, RAG apps and MCP servers, maintained by IBM's DataStax and extensible in Python.
Also: Open Source, Python
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HKUDS
Open-source, self-hosted personal AI agent you run yourself — browser UI, terminal or your chat apps, with memory, MCP tools and scheduled automations.
Also: Open Source, Python
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Run agent evals and private benchmarks in sandboxed cloud environments — compare Claude Code, Codex, Cursor and Copilot on the same real tasks.
Also: Developers, Evaluation
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Tatva Labs Inc.
Continuous automated QA for voice and chat AI agents, from pre-launch simulation to live call monitoring.
Also: Developers, Evaluation
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Lenz IO
Audit-grade fact-checking API for AI products — eight models across five stages, adversarial debate, and a full citation trail behind every verdict.
Also: Developers, Evaluation
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Mimo GmbH
Interactive coding courses with an AI tutor, covering Python, JavaScript, React, SQL and AI-assisted development through structured career paths.
Also: Developers, Python
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Serverless GPUs from a Python decorator — deploy models and batch jobs with no containers or cluster to manage.
Also: Developers, Python