Langfuse Alternative · Simpler self-hosting · MIT

AgentLens vs Langfuse
Both open-source. Different trade-offs.

Langfuse is a solid tool. But it runs on Postgres + ClickHouse + Redis, and the eval layer is DIY. AgentLens runs on SQLite, ships quality scoring out of the box, and focuses on what teams actually need on day one: is my LLM output any good?

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Quick Comparison

Feature-by-feature

Capability AgentLens Langfuse
Open source (MIT)✓ 100% MIT✓ core MIT, some under EE
Self-hostable✓✓
Minimum infra to self-host1 container + SQLitePostgres + ClickHouse + Redis
Fits on €5 VPS✓✗ needs ~€30+/mo
Auto quality scoring (zero config)✓Manual eval setup
Hallucination detection✓ built-inCustom eval required
Agent waterfall debugger✓✓
Prompt managementDebugger only✓ full prompt mgmt
Framework-agnostic SDK✓✓
Managed hosting entry price€299 / mo flatFree tier + $59/seat Core

Based on public Langfuse pricing as of April 2026. Verify at langfuse.com/pricing.

When to choose what

Honest recommendation

Choose Langfuse if…

  • You want rich prompt management (versioning, A/B, deploy flow)
  • You already run Postgres + ClickHouse infra
  • You want a larger existing community + plugins ecosystem
  • You'll build your own eval pipelines from scratch

Choose AgentLens if…

  • You want quality & hallucination checks working on day one
  • You want to self-host on a single €5 VPS, not a cluster
  • You want flat pricing, not per-seat billing
  • You need GDPR DPA without Enterprise negotiation
  • Your priority is "is my LLM output broken?" not "how do I version prompts?"
FAQ

Common questions

Is AgentLens open source like Langfuse?

Yes — fully MIT licensed. Langfuse is MIT for core with some features under commercial license. Both are self-hostable.

Why pick AgentLens over Langfuse?

Quality scoring + hallucination detection out of the box. Runs on SQLite (no ClickHouse cluster). Faster to self-host on small infra.

Can I migrate from Langfuse?

Yes. Both use a decorator/SDK model. Typical migration is under an hour.

Which is cheaper to self-host?

AgentLens: single container on a €5 VPS. Langfuse: Postgres + ClickHouse + Redis, typically €30-50/mo in infrastructure.

Does AgentLens have prompt management like Langfuse?

Not yet. AgentLens focuses on observability and debugging. If prompt versioning/deploy is your top need, Langfuse is stronger there.

Want it simpler?

15-minute migration call. We'll show you a 2-line integration on your own stack.

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