Top 10 Braintrust (AI Observability) Alternatives 2026

What is Athina AI?

Athina AI provides evaluation and monitoring for LLM applications, with a library of preset evaluators, support for custom ones, and dataset management for running experiments before shipping a prompt or model change. It offers a self-hosted deployment so prompts and completions stay inside the ...

What is Arize Phoenix?

Phoenix is Arize's open-source observability and evaluation tool for LLM applications, built on OpenTelemetry so traces are portable rather than locked to one vendor. It runs locally in a notebook or as a self-hosted service, capturing spans across retrieval, prompting and tool calls, and ...

What is TruLens?

TruLens is an open-source library for evaluating and tracing LLM applications, built around programmatic feedback functions that score outputs for groundedness, context relevance and answer relevance — the triad it uses to diagnose retrieval-augmented generation. Instrumentation is added in ...

What is Portkey?

Portkey is a gateway that sits between an application and model providers, adding routing and automatic fallback across models, semantic caching, rate limiting, guardrails and cost tracking, with observability over every request. Because it sits in the request path it captures traces without ...

What is Opik?

Opik is Comet's open-source platform for tracing, evaluating and monitoring LLM applications, covering development-time experimentation and production monitoring in one tool. It records traces across chains and agents, supports LLM-as-judge and heuristic evaluators, and can gate CI on ...

What is Confident AI?

Confident AI is the platform built around DeepEval, an open-source evaluation framework that treats LLM testing like unit testing — assertions over metrics such as faithfulness, answer relevance and contextual precision, runnable in CI. The hosted platform adds dataset curation, regression ...

What is Maxim AI?

Maxim AI covers the agent lifecycle from prompt experimentation through simulation and evaluation to production observability. Its simulation capability runs agents against generated user personas and scenarios to surface multi-turn failures that single-prompt evaluation misses — an agent can ...

What is Freeplay?

Freeplay is an operations platform for teams building AI features, covering prompt management and versioning, batch testing, human review workflows and production monitoring. Its emphasis is collaboration between engineers and the domain experts who judge whether output is actually good, giving ...

What is LangWatch?

LangWatch provides testing, evaluation and monitoring for LLM agents, with tracing across agent steps, automated evaluation including scenario-based agent testing, and prompt optimisation using DSPy. It is open-source with a self-hosted option and is framework-agnostic across common agent ...

What is HoneyHive?

HoneyHive provides observability and evaluation for production AI applications, combining distributed tracing across agent steps, online and offline evaluation, dataset curation from real traffic, and prompt management in one platform. Curating evaluation datasets directly from production ...