Alternatives to Neptune.ai

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

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

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

Honeycomb's natural-language query layer that turns plain-English questions into HQL against your live telemetry.

PostHog is an all-in-one product platform: analytics, session replay, error tracking, feature flags, experiments, surveys, and a managed data warehouse with a

Open-source Python framework for evaluating and monitoring LLMs, RAG apps, AI agents, and predictive ML models.

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.

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

NannyML estimates your ML model's live performance without ground-truth labels and alerts you only when it actually matters

Helicone is an AI gateway and LLM observability platform that routes, logs, and cost-tracks AI app traffic across 100+ models.

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

Free daily LLM speed benchmarks — compare time-to-first-token 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.

Voice AI QA and evals: simulate callers before launch, then score every production call on 500+ audio-native metrics.

OpenJudge is an open-source AI evaluation framework with 50+ production-grade graders for agents, multimodal models, code, and math.

Arize Phoenix is open-source LLM observability: trace every agent step, run evals, and self-host the whole thing.

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

Open-source tracing, evaluation, and prompt iteration for AI agents — self-host it on your own infrastructure with no per-span bill.

Agent and LLM observability from the LangChain team: trace, monitor, and evaluate agents in production, cloud, BYOC, or self-hosted.

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

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 tracing, versioning, and sessions for Python LLM apps—bring your own backend.

Eval, tracing, red teaming, and governance for teams that need AI quality standardized across products.

Open-source, OpenTelemetry-native evaluation and tracing that shows exactly where your AI agent fails — and where you can cut cost.

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

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

Collaborative AI development platform for prompt management, dataset evaluation, and production LLM monitoring.

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