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Langfuse vs SpiceDB

Observability for LLM apps, not a permissions database.

Side by side

What it is: Langfuse:Langfuse is an open-source platform for tracing, evaluating and monitoring LLM applications and AI agents.; SpiceDB:SpiceDB is an open-source, Google Zanzibar-inspired database for fine-grained permissions at scale.
Best for: Langfuse:LLM observability & analytics; SpiceDB:Zanzibar-style permission databases
Who it’s for: Langfuse:Developers building, debugging and scaling LLM-based apps and agents.; SpiceDB:Developers building authorization services for cloud-native applications.
Pricing: Langfuse:Freemium; SpiceDB:Freemium
Plans: Langfuse:Hobby Free · Core $29 per month · Pro $199 per month · Enterprise $2499 per month; SpiceDB:Open Source Free
Open source: Langfuse:Yes, 35,097 GitHub stars; SpiceDB:Yes, 7,099 GitHub stars
Works with: Langfuse:Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift; SpiceDB:Go, Java, NodeJS, Python, Ruby, Kubernetes, Prometheus, OpenTelemetry
DevHunt upvotes: Langfuse:89; SpiceDB:27
Launched on DevHunt: Langfuse:Jan 2023; SpiceDB:Jan 2024

Hierarchical Traces. Capture every LLM call, tool invocation and retrieval step with filters for user, session, cost and latency.
Prompt Management. Version, fetch, release and cache prompts separately from code with one-click deployments.
Evaluation Engine. Run LLM-as-judge, heuristic or human-review evaluations on production data or experiments.
Experiments & Datasets. Define test cases, run experiments and create golden datasets for continuous improvement.
Dashboards & Alerts. Monitor cost, latency and quality via custom dashboards and automated alerts.
Human Annotation. Collaborative human-in-the-loop workflows with annotation queues.
Extensive Integrations. Supports Python, TypeScript, Go, Java, .NET, Ruby, PHP, Swift and 100+ agent frameworks and model providers.
Self-hosted & Cloud Options. Available as hosted SaaS or self-hosted under MIT license.

Expressive APIs. gRPC and HTTP/JSON endpoints for authorization logic.
Distributed Graph Engine. Parallel graph processing faithful to the Zanzibar architecture.
Pluggable Storage. Supports in-memory, Spanner, CockroachDB, PostgreSQL and MySQL backends.
Configuration Language. SpiceDB Schema lets you define relationships, permissions and caveats.
Deep Observability. Prometheus metrics, pprof profiles, structured logging and OpenTelemetry tracing.
Kubernetes Operator. Manage, scale and upgrade SpiceDB clusters with a single resource.
zed CLI. Command-line tool for schema validation, permission checks and context switching.
Official Client Libraries. Go, Java, NodeJS, Python and Ruby SDKs for easy integration.

Based on each tool's website and DevHunt data. Details may change; check the official sites.