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Braintrust vs OpenObserve

A side-by-side comparison of Braintrust and OpenObserve, drawn from Ignaite's continuously-verified listings.

Compared from listings verified as of

Braintrust

Eval

Hosted eval + tracing platform for LLM apps.

View Braintrust

OpenObserve

Observability

Open-source observability for logs, metrics, traces and LLMs in one platform.

View OpenObserve

At a glance

Feature comparison of Braintrust and OpenObserve
AttributeBraintrustOpenObserve
Category (differs)EvalObservability
PricingFREEMIUMFREEMIUM
License (differs)ProprietaryOpen core
Deployment (differs)CloudHybrid
Platforms (differs)Web, APIWeb, API, CLI
Model support (differs)BYO key / modelModel-agnostic
Vendor (differs)BraintrustOpenObserve Inc.
Capabilities (differs)
  • LLM evaluation
  • LLM observability
  • Prompt management
  • MCP server
  • LLM observability
  • Text-to-SQL

The honest brief

Braintrust

Eval-first: prompts are versioned objects and CI scorers block a merge when quality regresses.

  • Eval workflow as the primary interface
  • CI scorers block merges on regression
  • Dataset versioning + OTel tracing
  • Generous free tier
  • Closed-source SaaS
  • Self-hosting needs Enterprise contract
  • Overkill for tiny single-file eval needs

OpenObserve

Claims ~140x lower storage cost than Elasticsearch via Parquet columnar storage, and unifies logs, metrics, traces, RUM and LLM observability in one binary.

  • Single binary self-host or managed cloud
  • Dashboards, alerts, and session replay
  • NL query assistant and SRE agent
  • Fully open source (AGPL-3.0)
  • Trusted by 6,000+ orgs
  • AGPL-3.0 can deter some commercial embedding
  • Younger ecosystem than Datadog/Grafana
  • Enterprise features gated above 50GB/day

When to pick which

Both cover LLM observability.

Pick Braintrust if you need LLM evaluation and Prompt management.

  • LLM evaluation (primary capability)
  • Prompt management (secondary capability)

Pick OpenObserve if you need MCP server and Text-to-SQL.

  • MCP server (secondary capability)
  • Text-to-SQL (secondary capability)

OpenObserve leans on LLM observability as a headline capability; Braintrust treats it as secondary.

  • LLM observability (primary capability)

They also differ on:

License
Proprietary · Open core
Deployment
Cloud · Hybrid
Platforms
Web, API · Web, API, CLI
Braintrust detailsOpenObserve details