Alternatives / Humanloop
Looking for an open source Humanloop alternative? We compared 9 open source tools for LLM tracing, evaluation, and prompt management by license, self-hosting, and maintenance. Langfuse and Arize Phoenix are the closest for observability, while Dify and Agno are broader app and agent platforms.
Written by Maxime DERAME
Last updated:
| Alternative | Best for | License |
|---|---|---|
| Dify | Visual builder for agentic apps and RAG | Dify Open Source License (modified Apache 2.0) |
| Agno | Framework and platform for agents | Apache-2.0 |
| Langfuse | Tracing, evals, and prompt management | MIT + ee folders |
| Arize Phoenix | OpenTelemetry tracing and evaluation | Elastic License 2.0 (source available) |
| Helicone | Logging, monitoring, and routing | Apache-2.0 |
| Latitude | Agent monitoring and failure clustering | MIT |
| LangWatch | Simulations and LLM-as-judge testing | Apache-2.0 + enterprise modules |
| OpenLIT | OpenTelemetry-based GenAI observability | Apache-2.0 |
| Spanlens | Drop-in SDK logging costs (very young) | MIT |
We looked for open-source tools that cover Humanloop's workflow: prompt management, evaluations, datasets, and tracing of LLM applications. We verified each project's license, recent activity, stars, and self-hosting in its repository, and flag licenses that restrict competing services. See our methodology for the full criteria.
Langfuse is the closest: tracing, evaluations, prompt management, datasets, and a playground, self-hosted or in its cloud. Arize Phoenix is built on OpenTelemetry for tracing and evaluation, and LangWatch adds simulations, LLM-as-judge scoring, and red-teaming.
Dify is a visual builder for agentic workflows and RAG apps, and Agno is a framework and platform for building and monitoring agents. They overlap with Humanloop's app side but are not pure evaluation tools.
Helicone logs, monitors, and routes LLM requests. Latitude monitors agents with trace search and failure clustering, OpenLIT adds GenAI observability on OpenTelemetry, and Spanlens is a very young drop-in SDK that logs requests and costs.
Arize Phoenix is under the Elastic License 2.0, which prevents offering it as a managed service. Dify uses its own Dify Open Source License with additional conditions, and Langfuse's enterprise features sit in separate directories.
Langfuse, Latitude, and Spanlens are MIT. Helicone, LangWatch, OpenLIT, and Agno are Apache-2.0. Arize Phoenix is Elastic License 2.0. Dify uses the Dify Open Source License.
All nine had commits within days of this update. Spanlens is very young with about 13 stars.
Humanloop is a proprietary hosted platform where prompts, traces, and evaluation data are stored on its servers and pricing scales with usage. Open-source tools keep traces and prompts on your infrastructure, avoid usage-based pricing, and plug into OpenTelemetry, at the cost of running the platform yourself.
Dify is a visual platform for building AI agents, RAG pipelines, and LLM apps on one collaborative workspace, deployable in the cloud, in a VPC, or self-hosted. It is licensed under the Dify Open Source License, which is based on Apache 2.0 with additional conditions: you may not operate a multi-tenant environment without written authorization, and you may not remove or modify the logo and copyright information in its frontend. An enterprise edition adds SSO, RBAC, and support.
Pricing: Free to self-host within the license terms; cloud and enterprise plans are paid.
Agno is more of an AI agent platform than a direct Kiro replacement. It provides memory, knowledge integration, tools, monitoring, and deployment capabilities for production AI agents.
Pricing: Open source and self-hostable; hosted services may be offered separately.
Langfuse is an open-source LLM engineering platform with tracing, evaluations, prompt management, datasets, and analytics for debugging and improving LLM applications, working with many frameworks and available self-hosted or as a cloud service. The repository is MIT, except for the ee folders, which are under a separate license, and the project is maintained by ClickHouse.
Pricing: Free to self-host; Langfuse Cloud has a free tier and paid plans.
Arize Phoenix is an open-source platform for LLM tracing, evaluation, and optimization, with automatic instrumentation for many frameworks, datasets, experiments, and a prompt playground, and it can be self-hosted. It is licensed under the Elastic License 2.0, which is source available and prohibits offering it as a managed service.
Pricing: Free to self-host; Arize offers paid hosted plans.
Helicone is an open-source platform for logging, monitoring, and debugging LLM applications through a proxy, with request logging, cost and latency tracking, caching, routing, a prompt playground, and datasets, under Apache-2.0. A production Helm chart is available for enterprise workloads on request.
Pricing: Free to self-host; hosted plans are paid.
LangWatch is a platform for testing, evaluating, and observing AI agents, with simulation-based testing, tracing, and evaluations, and multiple deployment models including self-hosting. The core is Apache-2.0 and the SDKs are MIT, while enterprise modules in platform/app/ee need a commercial license in production.
Pricing: Free to self-host the core; enterprise modules and cloud plans are paid.
Latitude is an MIT-licensed observability platform for AI agents that helps find where agents fail, with semantic search across traces, evaluations, and a workflow to fix issues and verify the fix against real traces. It can be self-hosted or used as a cloud service.
Pricing: Free to self-host; the cloud service is paid.
OpenLIT is an open-source observability platform for generative AI built on OpenTelemetry standards, with real-time monitoring, distributed tracing, cost tracking, and a UI for LLMs, vector databases, and GPUs. Self-hosted OpenLIT is free under Apache-2.0 with no license key and no per-trace fee.
Pricing: Free and open source; self-hosted with no license key.
Spanlens is an MIT-licensed open-source LLM observability tool that acts as a drop-in proxy for OpenAI, Anthropic, and Gemini, with request logging, cost tracking, and agent tracing, and it can be self-hosted with one Docker command. It is a very young project.
Pricing: Free to self-host.
| Alternative | Type | License | Self-hosted | Best for |
|---|---|---|---|---|
| Dify | LLM app platform | Dify Open Source License | Yes | Building LLM apps |
| Agno | Agent framework | Apache-2.0 | Yes | Agent builders |
| Langfuse | LLM observability | MIT + ee directories | Yes | Closest replacement |
| Arize Phoenix | LLM observability | Elastic License 2.0 | Yes | Evaluation workflows |
| Helicone | LLM gateway | Apache-2.0 | Yes | Cost and request monitoring |
| Latitude | Agent monitoring | MIT | Yes | Production agents |
| LangWatch | LLM testing | Apache-2.0 + ee | Yes | Agent testing |
| OpenLIT | LLM observability | Apache-2.0 | Yes | OpenTelemetry users |
| Spanlens | LLM proxy | MIT | Yes | Experimenting |
Want prompt management, evals, and tracing in one tool
Langfuse combines tracing, evaluations, prompt management, datasets, and a playground.
Want OpenTelemetry-native evaluation
Phoenix is built on OpenTelemetry and is fully self-hostable, under the Elastic License 2.0.
Want to build LLM apps visually
Dify provides a visual workflow builder, RAG pipelines, and a plugin marketplace.
Want to monitor costs and requests
Helicone logs and routes LLM requests with a playground and evaluators.