Best LLM Observability Tools
Compare 4 top-rated llm observability tools. Find features, pricing, pros, cons, and alternatives.
🏆 Top Tools in This Category
AIMon
🔴DeveloperAIMon (officially AIMon Labs) is a Bessemer Venture Partners-backed LLM evaluation and monitoring product focused on the hard problems that show up the moment an AI app reaches real users: hallucinations, instruction-following drift, completeness gaps, conciseness regressions, and toxicity or PII leakage. The team's bet is that generic LLM-as-judge approaches...
Braintrust
AI observability platform for evals, production tracing, prompt management, and regression detection.
Helicone
🔴DeveloperOpen-source LLM observability and AI gateway — logs every prompt, response, cost, and latency across 20+ providers with a one-line proxy or async SDK, plus caching, retries, and prompt experiments.
Langfuse
🔴DeveloperLangfuse is an open-source LLM observability and engineering platform providing tracing, prompt management, evaluations, and dataset management for production AI applications.
LLM Observability tools
AIMon
🔴DeveloperAIMon (officially AIMon Labs) is a Bessemer Venture Partners-backed LLM evaluation and monitoring product focused on the hard problems that show up the moment an AI app reaches real users: hallucinations, instruction-following drift, completeness gaps, conciseness regressions, and toxicity or PII leakage. The team's bet is that generic LLM-as-judge approaches are too slow and too expensive for production guardrails — so AIMon ships fine-tuned small-model detectors (the HDM-2 family of hallucinat
Key Features:
Freemium
Braintrust
AI observability platform for evals, production tracing, prompt management, and regression detection.
Key Features:
- •Workflow Runtime
- •Tool and API Connectivity
- •State and Context Handling
Starter is $0/month with 1 GB processed data, 10k scores and 14-day retention, then $4/GB and $2.50 per 1k scores. Pro is $249/month with 5 GB processed data, 50k scores and 30-day retention, then $3/GB and $1 per 1k scores. Enterprise is custom with RBAC, premium support, custom retention/export, and on-prem or hosted deployment options.
Helicone
🔴DeveloperOpen-source LLM observability and AI gateway — logs every prompt, response, cost, and latency across 20+ providers with a one-line proxy or async SDK, plus caching, retries, and prompt experiments.
Key Features:
- •Proxy-Based Request Logging
- •Cost Analytics & Budget Alerts
- •Gateway-Level Caching
Paid
Langfuse
🔴DeveloperLangfuse is an open-source LLM observability and engineering platform providing tracing, prompt management, evaluations, and dataset management for production AI applications.
Key Features:
- •Hierarchical Tracing & Agent Debugging
- •Production Prompt Management & Versioning
- •LLM-as-Judge Evaluation Framework
Free tier + Cloud plans from $29/month
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