The Best Lunary Alternatives in 2026

OpenLIT provides observability and evaluation for AI agents and coding agents, tracing models, tools, prompts, costs, and workflows.

Langfuse provides open-source evaluation and observability tools for tracing and improving AI agents.

This SDK provides AI evaluations, prompt management, and observability for Python and TypeScript workflows.

Bifrost by Maxim AI is an open-source AI gateway for LLMs, MCP and agents with routing, governance, guardrails and observability, supporting 8+ providers and 1000+ models via a drop-in SDK replacement.

PromptSite provides prompt version management for tracking, experimentation, and debugging LLM prompts.

Respan unifies LLM observability, evals, prompt optimization, and an AI gateway so teams can ship reliable AI applications.

Vercel’s AI SDK is a TypeScript toolkit for building AI applications and agents with React, Next.js, Vue, Svelte, and Node.js.

Compose, test, and optimize prompts for language-model applications in Promptmetheus, an IDE supporting more than 100 models.

TensorZero builds open-source tools for production-grade LLM applications: LLM gateway, observability, optimization, evaluations, and experimentation.

Deepchecks evaluates and monitors AI agents using testing, tracing, dataset scoring, and production observability tools.

PromptLayer supports prompt versioning, LLM evaluations, and production monitoring with traces, logs, and regression sets.

Confident AI provides evaluation, observability, red-teaming, and governance tools for testing and monitoring AI systems.

Comet's Opik platform provides AI observability, agent testing, evaluation, and monitoring for developers.

Parloa provides an AI agent management platform for contact centers and customer service operations.

Cohere develops AI models and solutions for enterprise process automation, employee tools, and turning fragmented data into insights.

Guardrails AI provides a framework for building, governing, and deploying reliability controls for generative AI systems.

Chutes provides serverless compute for deploying, running, and scaling AI models through its platform and API.

Helicone provides an AI gateway for routing and monitoring AI applications.

Eden AI routes requests across language and other AI models through a unified API with provider options.

Ship AI agents that reason, remember, and act in TypeScript. Mastra provides memory, tools, MCP, and observability to go from prototype to production.

Laminar provides open-source observability tools designed for applications built with AI agents.

Latitude provides observability for AI agents and helps teams trace failures and verify fixes.

Mirai Labs builds uzu, a Rust LLM engine for Apple devices, with compact Qwen, LFM, and Muse-Glimmer models.

Featherless is a serverless AI inference platform for open-weight models with API access to tens of thousands of models.