Product / UX / Telemetry & observability

Langtrace

Open-source, OpenTelemetry-based end-to-end observability tool for LLM applications. Provides real-time tracing, evaluations, and metrics for popular LLMs, frameworks, and vector databases. TypeScript and Python SDKs. Differentiated by strict OTel standards compliance and support for vector DB tracing. 1.2K GitHub stars.

Langtrace app v4.0.11 (17 Apr 2026); langtrace-python-sdk v3.8.12 (8 Apr 2026). Active and maintained as of June 2026 (initial fetch misread release year; corrected via release pages).

Openness

4 high confidence

4.0

license: app=AGPL-3.0(OSI, copyleft)
source: public

App is AGPL-3.0 (OSI-approved but strong copyleft, which deters proprietary embedding) and SDKs Apache-2.0; a managed cloud tier exists. Scored open_core/4 rather than 5 given the AGPL copyleft + hosted commercial offering.

https://github.com/Scale3-Labs/langtrace recorded 2026-06-04
AGPL-3.0 app license, Apache-2.0 SDKs, OTel-based observability
https://github.com/Scale3-Labs/langtrace/releases recorded 2026-06-04
app v4.0.11 release 17 Apr 2026 (active)

Adoption

2 medium confidence

2.0

~34.5K langtrace-python-sdk downloads/mo; ~1.2k GitHub stars. Real but small footprint; early-adopter tier.

https://pypistats.org/packages/langtrace-python-sdk recorded 2026-06-04
~34,497 langtrace-python-sdk downloads in last month

Capability

3 medium confidence

3.0

Strong tracing+cost+integration breadth but thinner prompt-mgmt/datasets surface than Langfuse C4; scored 3.

https://github.com/Scale3-Labs/langtrace recorded 2026-06-04
feature list: tracing, evaluations, cost/latency analytics, OTel, wide integrations

Unchanged since 2026-06-09 (last edited, not re-checked)