Braintrust vs Langfuse
Detailed side-by-side comparison to help you choose the right tool
Braintrust
🔴DeveloperAI evaluation
AI evals, prompt iteration and observability platform
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Starting Price
FreeLangfuse
🔴DeveloperOpen-source LLM observability
open-source LLM observability, tracing, prompt and eval platform
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FreeFeature Comparison
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💡 Our Take
Choose Braintrust if you need automated prompt optimization through the Loop agent and have budget for $25/seat/month — the automation pays for itself within 2-3 months for active teams. Choose Langfuse if you're budget-conscious, want full data sovereignty through self-hosting, or only need observability without automated improvement. Langfuse is the better pick for solo developers and open-source-first teams; Braintrust wins for production teams iterating on prompts weekly.
Braintrust - Pros & Cons
Pros
- ✓Strong fit for production AI teams because traces, datasets and experiments live in one workflow
- ✓Starter is $0/month with 1 GB processed data, 10k scores and 14-day retention
- ✓Pro is $249/month with 5 GB processed data, 50k scores, 30-day retention and priority support
- ✓Framework agnostic with Python, TypeScript, Go, Ruby and C# SDKs
Cons
- ✗The value shows up after you have real traffic or evaluation datasets; it may be overkill for prototypes
- ✗Data and score overages require attention on high-volume products
- ✗Enterprise deployment choices need procurement and security review
Langfuse - Pros & Cons
Pros
- ✓Open-source and self-hostable, which is valuable for teams that do not want observability locked fully in a SaaS.
- ✓Clear fit for prompt lifecycle management: versioning, fetching, traces, datasets, and evals in one workflow.
- ✓MCP support is useful for coding agents that need to inspect or update observability assets safely.
- ✓Cloud pricing starts low enough for serious prototypes while still offering enterprise controls.
Cons
- ✗Unit-based pricing requires teams to understand how traces and observations translate into monthly spend.
- ✗Self-hosting reduces vendor lock-in but adds ClickHouse/database operations and upgrade responsibility.
- ✗Not a full application monitoring suite; you still need product analytics and infrastructure observability.
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