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Litefuse·The Agent Observability and Evaluation Platform

Ship reliable AI agentswith evaluation-driven development

Langfuse SDK compatible·Lightweight architecture powered by Apache Doris·80% lower storage cost

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100k events/month · no credit card

01 · OBSERVABILITY

See every step your agent takes.

Nested traces for every LLM call, tool use, and subagent hop. Debug production with full input, output, cost, and latency.

02 · PROMPT MANAGEMENT

Manage prompts without touching code.

Version, label, and deploy prompts from the UI. Ship changes to production in seconds — no redeploy, no engineer required.

03 · EVALUATION

Measure quality. Catch regressions early.

LLM-as-judge, user feedback, custom metrics, and datasets. Run evals online on production traces or offline against test sets.

traces/b8f3a · code-review-agent1.24s · 7 observations

▾code-review-agentspan

1.24s

◆planclaude-3.5-sonnetgeneration

398ms

◆tool.read_filesrc/auth.tsspan

18ms

◆tool.grep"validateToken"span

12ms

▾subagent.security-reviewspan

612ms

◆analyzeclaude-3.5-haikugeneration

540ms

◆summarizeclaude-3.5-sonnetgeneration

204ms

prompts/code-review-agentv2.4 · production

code-review-agentCHATv2.4

Diff v2.3Deploy →

system

You are an expert code reviewer focused on {{focus_areas}}. For the codebase at {{repo_path}}, flag findings by severity (P0, P1, P2) and cite file:line for every issue. Be direct — no praise-hedging.

user

Review this pull request:
{{diff}}

datasets/code-review-golden/runs128 items · 2 runs compared

dataset run comparison — llm-as-judge + custom metrics

v2.3 · baseline

pass rate

91.4%

avg judge score

4.50/5

hallucination rate

0.08

v2.4 · current

pass rate

94.2%▲ 2.8

avg judge score

4.62/5▲ 0.12

hallucination rate

0.03▼ 0.05

latency / cost

p50 latency

1.24s

p95 latency

3.87s

avg cost / run

$0.012

judge score · last 14 daysv2.3v2.4

Integrations

Plug into your entire AI stack.

Trace every tool call, subagent, and hook with two lines of config. See your coding agent's full decision tree, end to end.

Full session replay for autonomous coding agents. Debug why a run went off the rails — step by step, tool by tool.

Multi-agent orchestration visibility out of the box. See how specialist agents coordinate, where handoffs happen, what each costs.

and everything else you already run

OpenAI

Anthropic

Google Gemini

Mistral

AWS Bedrock

Azure OpenAI

Vercel AI SDK

LangChain

LangGraph

LlamaIndex

DSPy

Pydantic AI

Smolagents

CrewAI

OpenAI Agents SDK

LiteLLM

Instructor

Mirascope

Flowise

Langflow

Together AI

Groq

Fireworks

OpenTelemetry

Explore 100+ more integrations →

Comparison

Forked from Langfuse. More lightweight and cost-effective.

Dimension

Langfuse

Litefuse

Services to deploy

6 — app + web + Postgres + ClickHouse + Redis + MinIO

2 app + Apache Doris

Storage cost (relative)

Baseline

~80% reduced

Full-text search

Basic text search

Native inverted index · CJK-capable

Built-in agent integrations

Via community SDKs

Claude Code · OpenClaw · Hermes

Comparison as of April 2026 based on public Langfuse docs. Not affiliated with or endorsed by Langfuse. Methodology →

Start shipping reliable AI agents with Litefuse.

100k events/month · no credit card · 5 minutes to your first trace

Start Free →Get a Demo