Catch quality drops before users do, debug agent failures in seconds, and control costs — without prompts ever leaving your infrastructure.
Self-hosted · MIT License · GDPR Article 28 ready · 2-line integration
Every LLM app in production has the same three problems — and most teams don't notice until users complain.
A prompt change tanks your output quality. You find out via user churn, not alerts.
One bad loop in an agent burns $200 in 10 minutes. No one notices until the invoice arrives.
Your 5-step agent fails on step 3. Good luck figuring out which step, why, and how long it took.
User prompts and outputs in a third-party SaaS. Legal says no. No audit trail either.
Everything you need to understand, debug, and improve your LLM app. Your data stays on your server.
Every response gets a 0–1 quality score automatically. Heuristic-based or powered by Claude as judge.
Flags responses with confident-sounding false claims, repetition, refusals, and empty outputs.
Per-call cost calculated from token counts. Daily budget alerts via webhook or email before you overspend.
Waterfall timeline of every agent step. See which span is slow, expensive, or failing — at a glance.
Compares current quality window vs previous. Alerts when quality drops more than your threshold.
Export all data as JSON/CSV. Set retention policies. Delete by request ID. Full audit log.
A 12-person legal tech team in Germany. AI contract analyzer. Three problems they couldn't solve with LangSmith or Helicone.
"We had a prompt change tank quality by 22% on a Friday afternoon. We found out on Monday via support tickets. With AgentLens, we would have caught it in 90 minutes — automatically."
AgentLens is designed around one constraint: your LLM data never leaves your infrastructure. That shapes everything — from how it deploys to how it's priced.
| Capability | AgentLens | LangSmith | Helicone |
|---|---|---|---|
| Self-hosted deployment | ✓ default | Enterprise plan only | Cloud only |
| EU data residency / GDPR DPA | ✓ Team plan+ | Enterprise plan only | Not available |
| Automatic quality scoring | ✓ zero config | Manual eval setup required | Not available |
| Hallucination detection | ✓ built-in | Not available | Not available |
| Agent waterfall debugger | ✓ | ✓ | Not available |
| 2-line integration | ✓ | ✓ | ✓ |
| Managed hosting — entry price | €299 / mo | from $39 / seat / mo | from $0 / mo (cloud) |
Comparison based on publicly available information as of April 2026. Features and pricing may have changed — verify at langchain.com/pricing and helicone.ai/pricing. "Enterprise plan only" indicates the feature requires a paid enterprise contract with the respective vendor.
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The full dashboard is running with demo data. Click around, explore the Agent Debugger, try the filters.