Stay free if you only need end-to-end llm span tracing and token usage and cost tracking. Upgrade if you need infrastructure monitoring and apm and distributed tracing. Most solo builders can start free.
Why it matters: Span-based pricing can escalate unpredictably for high-volume AI applications — some users report $120+/day costs
Available from: Datadog Platform (prerequisite) ($15/month per host)
Why it matters: Auto-activation of LLM observability when spans are detected can cause surprise billing if not configured carefully
Available from: Datadog Platform (prerequisite) ($15/month per host)
Why it matters: Requires existing Datadog infrastructure investment to realize full value — not practical as a standalone LLM monitoring tool
Available from: Datadog Platform (prerequisite) ($15/month per host)
Why it matters: Overkill for small teams or simple LLM applications that don't need infrastructure correlation
Available from: Datadog Platform (prerequisite) ($15/month per host)
Why it matters: Learning curve for teams new to Datadog's platform — configuration and dashboard setup require Datadog expertise
Available from: Datadog Platform (prerequisite) ($15/month per host)
The free plan covers basic analytics & monitoring needs. For professional use with advanced features and higher limits, consider upgrading to a paid plan.
Check the comparison above for the most affordable paid tier that includes premium features beyond the free plan limitations.
Many tools offer free trials of paid tiers. Visit Datadog LLM Observability's website to check current trial offerings and duration.
Most tools allow downgrades, but you may lose access to paid features and data. Check Datadog LLM Observability's policy before upgrading.
Start with the free plan — upgrade when you need more.
Get Started Free →Still not sure? Read our full verdict →
Last verified March 2026