Langfuse vs Portkey
Detailed side-by-side comparison to help you choose the right tool
Langfuse
🔴DeveloperAI observability
An open-source observability and evaluation platform for language-model applications.
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FreePortkey
🔴DeveloperAI gateway
An AI gateway and control platform for routing, observing, and governing model traffic.
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CustomFeature Comparison
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Langfuse - Pros & Cons
Pros
- ✓Open source with free self-hosting — full feature parity without usage limits
- ✓Free Hobby tier on cloud with no credit card — lowest barrier to entry in the category
- ✓Trace graphs for multi-agent systems are genuinely useful for debugging complex failures
- ✓Prompt management + evals turns prompt engineering into a systematic, measurable process
- ✓40,000+ builders using it — extensive community resources and integrations
- ✓Integrates natively with LangChain, LlamaIndex, OpenAI SDK, and Anthropic
Cons
- ✗Pro plan units pricing ($8/100k) can add up for high-volume production applications
- ✗Enterprise SSO requires the $300/month Teams add-on on top of Pro — costly for mid-size teams
- ✗Self-hosting requires Docker/Kubernetes operational knowledge
- ✗UI can feel overwhelming for teams who just want simple cost/latency dashboards
- ✗Real-time alerting features are less developed than commercial-first alternatives like Arize
- ✗Enterprise tier at $2,499/month is priced for large organizations — no mid-market option
Portkey - Pros & Cons
Pros
- ✓Provider-agnostic routing with declarative configs that an SRE can change without app deploys
- ✓Strong governance primitives (virtual keys, budgets, RBAC) that internal gateways usually skip
- ✓Built-in guardrails and observability remove the need for a separate vendor for each
- ✓Self-hosted and BYOC options make it viable for regulated and air-gapped deployments
Cons
- ✗Pricing page is JS-rendered and dollar amounts must be confirmed manually on site
- ✗Adds a network hop and latency overhead — small but non-zero next to direct provider calls
- ✗Overkill for single-provider single-app teams who do not need governance
- ✗Some advanced features (Agents, BYOC) require Enterprise contracts
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