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-host | 1 container + SQLite | Postgres + ClickHouse + Redis
Fits on €5 VPS | ✓ | ✗ needs ~€30+/mo
Auto quality scoring (zero config) | ✓ | Manual eval setup
Hallucination detection | ✓ built-in | Custom eval required
Agent waterfall debugger | ✓ | ✓
Prompt management | Debugger only | ✓ full prompt mgmt
Framework-agnostic SDK | ✓ | ✓
Managed hosting entry price | €299 / mo flat | Free 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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