Alternatives to Helicone

Enterprise LLM evaluation, observability, and AI red teaming that standardizes quality across every team.

Fiddler AI is an enterprise AI control plane for agent observability, guardrails, and governance across the agentic lifecycle.

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

Open-source AI evaluation and observability for LLMs, RAG, agents, and predictive ML models.

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

Agent observability that traces, replays, and debugs AI agent runs across 400+ LLMs and frameworks

Free daily LLM speed benchmarks: compare TTFT and tokens-per-second across models and regions.

Replay your live LLM traffic on candidate models to see exactly what behaviour changes before you switch.

Arize Phoenix is open-source LLM observability and evals that trace every agent step so you can ship reliable AI agents.

OpenTelemetry-native observability with an AI SRE that investigates incidents and opens fix PRs.

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

Open-source LLM observability, prompt management, and evaluation for teams running AI agents in production.

LangSmith is an AI agent observability platform for tracing, monitoring, and evaluating LLM apps and long-running agents.

AI observability and eval-engineering platform that turns offline evals into live production guardrails.

Opik, Comet's open-source LLM observability and eval platform, turns agent traces into root-cause groupings and git-committed code fixes

Open-source OpenTelemetry observability for Python LLM apps

MLflow is the open source AI engineering platform for agent and LLM observability, evaluation, and prompt management.

Track, forecast, and optimize AI spend across OpenAI, Google AI, Azure, and Bedrock.

Discontinued: WhyLabs ceased operations in 2025 and open-sourced its platform; whylogs and langkit live on as open source.

Maxim AI simulates, evaluates, and observes AI agents in one workspace, with an open-source gateway (Bifrost) for routing and governance.

AI observability platform that turns offline evals into production guardrails for AI agents and RAG systems.

Pre-trained finance AI models and API infrastructure for banks, insurers, and lenders, moving into agentic workflow orchestration.

TruEra brings ML monitoring, testing, and AI quality management into Snowflake for production model observability.

Agent observability that traces every AI run, scores quality with evals, and surfaces production patterns you didn't know to look for.

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

Raindrop is agent observability that finds silent failures in production AI agents, investigates the root cause, and simulates the fix before you merge.

Open-source LLM observability, prompt management, and agent evals in one MIT-licensed platform.

Free, MIT-licensed desktop widget that shows token usage, spend, and quota limits across 29+ AI coding tools on your own machine.

Neon is a serverless Postgres backend platform from Databricks with instant branching, autoscaling, and bundled auth, storage, functions, and an AI Gateway.

Free, MIT-licensed local dashboard that reads your AI coding agents' log files to show tokens, cost, and traces — no SDK or API key.