Langfuse alternatives
Langfuse is open-source LLM engineering platform for tracing, prompt management and evaluations. If it is not the right fit on price, features or setup, these 10 tools do a similar job. We rank them by how closely they match Langfuse, and every listing is checked against its official site.
Compare Langfuse and its alternatives
| Tool | Best for | Pricing | Starts at | MCP server |
|---|---|---|---|---|
| Langfusecurrent | Engineering teams tracing and evaluating LLM apps | Open source | Free Hobby cloud plan and free self-hosting, Core from $29/month, Pro $199/month (as of October 2026) | Official |
| Arize AI | Teams monitoring and evaluating LLM agents in production | Free plan | Free AX plan, AX Pro $50/month, Enterprise custom (as of October 2026) | Not checked |
| Braintrust | AI product teams running evals on agents in production | Free plan | Free Starter plan, Pro $249/month, Enterprise custom (as of October 2026) | Official |
| Promptfoo | Developer and security teams red teaming LLM apps in CI | Open source | Free open-source Community plan with 10k red team probes/month, Enterprise and On-Premise priced on request (as of October 2026) | Not checked |
| Amazon Bedrock Guardrails | Teams building AI apps on AWS that need central safety policies | Paid | See site | Not checked |
| Azure AI Content Safety | Teams on Azure and Microsoft Foundry moderating AI input and output | Free plan | See site | Not checked |
| Promptitude | Teams managing prompts and content workflows | Free plan | 100K free tokens on sign-up | Not checked |
| LangChain | Engineering teams building and monitoring LLM agents | Open source | Framework free; LangSmith Developer free, Plus $39/seat/month plus usage (as of October 2026) | Not checked |
| NeMo Guardrails | Engineering teams that want self-hosted, code-level control over LLM guardrails | Open source | See site | Not checked |
| Ollama | Developer teams running open models privately or on their own hardware | Open source | Free to run locally, cloud plans from $20/month (as of October 2026) | Not checked |
| Chatbot UI | Developers who want their own multi-model chat front end | Open source | See site | Not checked |
The alternatives
1. Arize AI
Agent observability and evaluation platform, with the open-source Phoenix for tracing and evals.
Pricing: Free plan, from Free AX plan, AX Pro $50/month, Enterprise custom (as of October 2026) · Best for: teams monitoring and evaluating LLM agents in production · Also covers: ai safety, evaluation, llm observability
2. Braintrust
AI observability and evals platform for tracing agents, running experiments and scoring outputs.
Pricing: Free plan, from Free Starter plan, Pro $249/month, Enterprise custom (as of October 2026) · Best for: aI product teams running evals on agents in production · Also covers: ai safety, evaluation, llm observability
3. Promptfoo
Open-source CLI and platform for red teaming, scanning and evaluating LLM apps and agents.
Pricing: Open source, from Free open-source Community plan with 10k red team probes/month, Enterprise and On-Premise priced on request (as of October 2026) · Best for: developer and security teams red teaming LLM apps in CI · Also covers: ai safety, evaluation
4. Amazon Bedrock Guardrails
Configurable safety filters for generative AI apps on AWS, usable with any model via the ApplyGuardrail API.
Pricing: Paid · Best for: teams building AI apps on AWS that need central safety policies · Also covers: ai safety
5. Azure AI Content Safety
Microsoft's API for detecting harmful content, prompt attacks and ungrounded output in AI apps.
Pricing: Free plan · Best for: teams on Azure and Microsoft Foundry moderating AI input and output · Also covers: ai safety
6. Promptitude
Platform to create, test and manage prompts and connect AI to business workflows.
Pricing: Free plan, from 100K free tokens on sign-up · Best for: teams managing prompts and content workflows · Also covers: prompt management
7. LangChain
Open-source framework for building LLM apps, with the LangSmith platform for monitoring and deployment.
Pricing: Open source, from Framework free; LangSmith Developer free, Plus $39/seat/month plus usage (as of October 2026) · Best for: engineering teams building and monitoring LLM agents
8. NeMo Guardrails
NVIDIA's open-source toolkit for adding programmable input, dialog, retrieval and output rails to LLM apps.
Pricing: Open source · Best for: engineering teams that want self-hosted, code-level control over LLM guardrails
9. Ollama
Run open models locally or in Ollama's cloud through one API.
Pricing: Open source, from Free to run locally, cloud plans from $20/month (as of October 2026) · Best for: developer teams running open models privately or on their own hardware
10. Chatbot UI
Open-source chat interface that works with many AI models, self-hosted or hosted.
Pricing: Open source · Best for: developers who want their own multi-model chat front end
Frequently asked questions
What is the best alternative to Langfuse?+
Arize AI, Braintrust and Promptfoo are the closest matches in our directory. Arize AI: Agent observability and evaluation platform, with the open-source Phoenix for tracing and evals.
Is there a free alternative to Langfuse?+
Arize AI, Braintrust, Promptfoo and Azure AI Content Safety have a free plan or are open source. Free plans usually cap usage or features.
Is there an open-source alternative to Langfuse?+
Yes: Promptfoo, LangChain and NeMo Guardrails.
What is Langfuse?+
Open-source LLM engineering platform for tracing, prompt management and evaluations.
More alternatives