Alternatives to Lilypad

OpenLIT is an open-source, OpenTelemetry-native agent harness engineering platform for LLM tracing, evals, and guardrails you self-host.

Open source AI engineering platform for agent and LLM tracing, evaluation, prompt management, and ML lifecycle work.

Open-source Python framework that replaces vibe checks with reproducible evaluation loops for RAG pipelines and AI agents.

Evidently AI is an open-source Python framework for LLM evaluation, RAG testing, and ML model monitoring under Apache 2.0.

Open-source AI observability for agent tracing, LLM-as-a-judge evals, and coding-agent cost tracking.

Arize Phoenix is open-source LLM observability: trace agent steps, run evals, and self-host your traces.

Dash0 is OpenTelemetry-native observability where Agent0 investigates incidents, finds root cause, and opens fix PRs.

Open-source LLM observability and agent evaluation you can trace, evaluate, and self-host for free.

Open-source LLM observability and agent evals: trace, evaluate, and improve production AI agents with MIT-licensed tooling.

TruLens traces AI agent runs with OpenTelemetry-native evals, showing where an agent fails and where you can cut cost.

Open-source AI coworker workspace that builds, schedules and ships agents to Slack or Telegram

Maxim AI evaluates, simulates and observes AI agents — with Bifrost, its open-source LLM gateway, handling routing, budgets and guardrails.

Langfuse Prompt Experiments links LLM tracing, prompt versioning, and evaluators so you can test prompts against real production data.

Open-source agent observability that auto-captures every LLM and tool call and flags failures you never wrote a detector for.

Free open-source AI usage tracking and analytics that syncs your token and cost data from Claude, Cursor, ChatGPT and other tools onto a shareable dashboard.

OpenJudge is an Apache 2.0 open-source AI evaluation framework shipping 50+ benchmark-validated graders for agents, LLMs, code, math, and multimodal models.

ToolSpend tracks AI API spend across OpenAI, Anthropic, Google AI, Bedrock and Azure in one live cost dashboard.

Weights & Biases tracks ML experiments and traces LLM apps so teams ship AI models faster

Developer observability platform that traces, replays, and debugs AI agent runs across OpenAI, CrewAI, Autogen and 400+ LLMs

OpenCompass (司南) benchmarks LLMs, VLMs, and AI4S models on 100+ open evaluation datasets with dated leaderboards

Metoro is a Kubernetes observability and AI SRE agent that watches your cluster with eBPF and opens fix PRs for production issues.

Silico is Goodfire's interpretability agent for understanding and debugging the internals of your AI models.

LangSmith is agent and LLM observability: trace, monitor, and evaluate AI agents in cloud, BYOC, or self-hosted.

Galileo AI Evals turns offline evaluations into production guardrails that gate your AI agents in real time.

Opik by Comet turns LLM traces into root-cause groupings, eval scores and code fixes so agent teams stop shipping the same bug twice

LLM evaluation, observability, and red teaming in one workspace — ship AI you can actually trust

Athina AI is a collaborative AI development platform for managing prompts, running LLM evaluations, and monitoring production traces in one

Fiddler AI is an enterprise AI control plane for agent observability, inline guardrails, and auditable AI governance.

Honeycomb Query Assistant turns plain-English questions into HQL against live production telemetry.

PostHog is product analytics with session replay, feature flags, error tracking, and a context warehouse for you and your AI agents.