Langfuse vs PromptLayer
Two of the most-asked-about agents in the developer-tools space. Here's how they actually stack up.
Langfuse
Open-source LLM observability with full self-hosting and production-ready tracing
Free tier
Read full review →PromptLayer
Prompt versioning, management, and monitoring for teams shipping LLM applications
Free tier
Read full review →Side-by-side comparison
| Langfuse | PromptLayer | |
|---|---|---|
| Tagline | Open-source LLM observability with full self-hosting and production-ready tracing | Prompt versioning, management, and monitoring for teams shipping LLM applications |
| Pricing | Free tier | Free tier |
| Categories | developer-tools, open-source, api | developer-tools, productivity |
| Made by | Langfuse | PromptLayer |
| Launched | 2023-07 | 2022-12 |
| Platforms | Web, API, Self-hosted | Web, API |
| Status | active | active |
Langfuse highlights
- + Full trace and span logging for any LLM framework or direct API calls
- + Self-hosting via Docker Compose or Kubernetes: own your data completely
- + Prompt management with versioning, tags, and production/staging environments
- + Dataset and evaluation system: run evals on curated test sets
- + Score collection for human feedback and LLM-as-judge evaluation
PromptLayer highlights
- + Prompt versioning with named releases and rollback capability
- + Request log viewer: see every LLM call with full prompt, response, and metadata
- + Search and filter request history by metadata, model, or custom tags
- + Analytics dashboard: track token usage, latency, and cost over time
- + Visual prompt template editor with variable injection
Frequently Asked Questions
Which is better, Langfuse or PromptLayer?
Neither is universally better. Langfuse (Free tier) leans into developer-tools, while PromptLayer (Free tier) is closer to developer-tools. Pick based on which workflow you actually do every day.
What is the price difference between Langfuse and PromptLayer?
Langfuse is free tier. PromptLayer is free tier. See the pricing row in the comparison table.
Can I use Langfuse and PromptLayer together?
In most cases, yes. They serve overlapping but distinct needs, so running them side by side is common until you decide which fits your workflow.