OpenLLMetry is a free, open-source OpenTelemetry-based SDK for LLM app observability from Traceloop. See features, pricing, and top alternatives for 2026.
Category
AI Infrastructure & MLOps
Pricing
Open Source, from Free (SDK); optional Traceloop hosted platform has a free tier with paid plans custom-priced
Verified
Not yet
Last updated
July 19, 2026
Founded
2022
Headquarters
Tel Aviv, Israel
APIOpen SourceAISelf-Hosted
Overview
OpenLLMetry is an open-source SDK that brings observability to LLM applications by extending OpenTelemetry, letting developers trace model calls, agent behavior, and vector database queries with minimal code changes.
It was built by Traceloop, a Tel Aviv startup founded in 2022 and acquired by ServiceNow in March 2026, though OpenLLMetry itself remains open source and independently usable.
Key Features
A single line of instrumentation code automatically traces calls to LLM providers such as OpenAI and Anthropic, along with vector database and agent framework activity.
Because it is built on OpenTelemetry, trace data exports to more than 25 observability backends, avoiding vendor lock-in, while the optional Traceloop platform adds monitoring dashboards, evaluation tooling, and prompt management.
Pricing
The OpenLLMetry SDK itself is free and open source under the Apache 2.0 license, with no cost to instrument and export traces to a compatible backend.
Traceloop's optional hosted platform offers a free tier for up to 50,000 spans per month and 5 seats, with an Enterprise plan for larger teams priced on request.
Key Features
One-line instrumentation — Add full LLM application tracing with a single line of code, no manual span instrumentation required.
OpenTelemetry-native — Built directly on OpenTelemetry standards, exporting data compatible with 25-plus observability backends.
Multi-provider LLM support — Automatically traces calls to major LLM providers including OpenAI and Anthropic.
Vendor-neutral data export — No lock-in to a single observability vendor since traces follow open OpenTelemetry semantic conventions.
Evaluation dashboards (via Traceloop) — Track LLM output quality and run evaluations against production traces.
CI/CD integration — Integrate prompt and trace testing into CI/CD pipelines for safer LLM app deployments.
Pros & Cons
Pros
Fully open source and free under the Apache 2.0 license
Extremely fast to integrate with one-line instrumentation
Vendor-neutral OpenTelemetry foundation avoids lock-in
Large and fast-growing adoption with 500,000-plus monthly installs
Backed by ServiceNow's resources following the 2026 acquisition
Cons
Full monitoring and evaluation platform requires a paid Traceloop plan beyond free-tier limits
Free tier data retention is limited to 24 hours
Enterprise pricing for the hosted platform is not publicly listed
Relatively young product line launched in 2022
Post-acquisition roadmap integration with ServiceNow introduces some uncertainty for standalone users
Pricing
OpenLLMetry SDK Free N/A
Traceloop Free Forever $0/month Monthly
Traceloop Enterprise Custom Custom
Frequently Asked Questions
Is OpenLLMetry free?
Yes, the OpenLLMetry SDK is open source under the Apache 2.0 license and free to use; only Traceloop's optional hosted platform has paid tiers beyond its free plan.
What is the difference between OpenLLMetry and Traceloop?
OpenLLMetry is the open-source SDK for instrumenting LLM applications, while Traceloop is the company that built it and offers an optional hosted platform for visualizing and managing that trace data.
Which LLM providers does OpenLLMetry support?
OpenLLMetry automatically traces calls to major LLM providers such as OpenAI and Anthropic, along with vector databases and agent frameworks.
Is OpenLLMetry based on OpenTelemetry?
Yes, OpenLLMetry extends OpenTelemetry, the industry-standard observability framework, so its trace data works with more than 25 existing observability backends.
Who acquired Traceloop?
ServiceNow acquired Traceloop in March 2026 to power its AI Control Tower governance platform, while committing to keep OpenLLMetry open source.
Can I self-host OpenLLMetry data?
Yes, since OpenLLMetry exports standard OpenTelemetry data, you can route it to any self-hosted or third-party observability backend rather than using Traceloop's hosted platform.
Who is OpenLLMetry for?
It is built for AI engineering and ML platform teams that need visibility into the cost, latency, and reliability of LLM-powered applications.