Helicone vs LangWatch

Pick two tools from the same category to compare side-by-side.

	Helicone LLM observability and cost tracking via proxy or async logging.	LangWatch Open-source LLM observability, evaluation, and AI agent testing platform.
Category	observability	observability
Vendor type	hybrid	hybrid
Pricing	freemium	freemium
Strengths	+ Drop-in proxy integration + Cost dashboards readable by non-engineers + Open source with managed option	+ Fully open-source with local and self-hosted options + Native OpenTelemetry support, framework and provider agnostic + Combines observability, evaluation, and prompt management + Agent simulation across scenarios, languages, and edge cases
Tradeoffs	− Proxy adds a small latency hop (mitigated by async mode)	− Broad feature surface can add setup overhead − Managed cloud usage billed per event beyond included quotas
Used in stacks	13	0