alternatives to
LangChain's hosted platform for tracing, evaluating and monitoring LLM applications and agents. A closed product from LangChain.
| Tool | Fit | Stars | Licence | Terms | Self-hosted | Language | Latest | Last push |
|---|---|---|---|---|---|---|---|---|
| Langfuse | Full replacement | 35k | Other | Open core | Yes | TypeScript | v4.53.0 | 2026-10-06 |
| Opik | Full replacement | 22k | Apache-2.0 | Open source | Yes | Python | 2.2.92 | 2026-10-06 |
| Arize Phoenix | Full replacement | 12k | Other | Source available | Yes | Python | arize-phoenix-v20.19.0 | 2026-10-06 |
| LangWatch | Full replacement | 4.9k | Apache-2.0 | Open source | Yes | TypeScript | langwatch-3.20.1 | 2026-10-06 |
| Agenta | Full replacement | 4.8k | Other | Open core | Yes | TypeScript | v0.122.1 | 2026-10-06 |
| Laminar | Full replacement | 3.3k | Apache-2.0 | Open source | Yes | TypeScript | v0.2.5 | 2026-10-06 |
| Evidently | Partial | 8k | Apache-2.0 | Open source | Yes | Jupyter Notebook | v0.7.23 | 2026-09-29 |
| Helicone | Partial | 6.2k | Apache-2.0 | Open source | Yes | TypeScript | v2025.08.21-1 | 2026-09-16 |
| OpenLIT | Partial | 2.8k | Apache-2.0 | Open source | Yes | TypeScript | openlit-2.1.0 | 2026-10-05 |
9 alternatives
🪢 Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.
Tracing, prompt management, datasets and evaluations, with OpenTelemetry ingestion.
Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready dashboards.
Tracing, datasets, experiments and LLM-as-a-judge evaluations.
AI Observability & Evaluation
Tracing over OpenTelemetry, datasets, experiments and evaluations.
Open-Source Agent Observability & Evals for AI Platform teams. Trace, test, route and govern every agent & coding assistant in the company.
Tracing, evaluations and agent simulations, with OpenTelemetry ingestion.
Agenta is a workspace where you and your team build agents and automations.
Prompt management, evaluations and tracing in one platform.
Laminar - open-source observability platform purpose-built for AI agents. YC S24.
Tracing, evaluations and datasets for LLM apps and agents, with OpenTelemetry ingestion.
Evidently is an open-source ML and LLM observability framework. Evaluate, test, and monitor any AI-powered system or data pipeline. From tabular data to Gen AI. 100+ metrics.
Evaluations and monitoring for ML and LLM systems, from a Python library with a self-hosted UI.
🧊 Open source LLM observability platform. One line of code to monitor, evaluate, and experiment. YC W23 🍓
Logs requests through a proxy gateway, with cost tracking and prompt versions, lighter on agent traces and evaluations.
OpenLIT is the open-source agent harness engineering platform: trace, evaluate, guard, and improve everything around the model in your AI agents, on OTEL.
OpenTelemetry-native traces and metrics for LLM apps, GPUs and vector databases, with prompt management.