DeepEval suits developers building repeatable evaluations for AI systems, especially those running tests in Python or CI/CD.
Free plan Open source From $200 a month WebWindowsMacLinuxAPISelf-hosted
Best Llm Developer Tools 2026
Every product here is ranked by Samsung Mobile US Press's record score: what its maker publishes about it, where it runs (Android first), whether it is free to try, and how recently the facts were read.
02
Langfuse
Langfuse suits teams building AI agent applications that need tracing, prompt management, and evaluation tools.
WebLinuxAPI+1 Record5.7 Visit
03
Opik
Opik suits teams developing applications or agents that call an LLM and need to inspect, evaluate, and monitor their behavior.
WebLinuxAPI+1 Record5.4 Visit
04
LangSmith
LangSmith suits teams developing AI agents that need evaluation, prompt tools, tracing, and production monitoring.
WebWindowsMac+3 Record5.3 Visit
05
Promptfoo
Promptfoo is for developers and enterprises building AI applications who need prompt evaluation or red-team testing.
WebWindowsMac+3 Record5.3 Visit
6
Helicone
WebAPISelf-hosted $79 usage-based Record5.1 Visit It suits teams building or operating AI applications that need provider routing, request tracing, or cost visibility.
7
Braintrust
WebAPISelf-hosted $249 a month Record5.0 Visit Braintrust is intended for teams running AI agents in production, from early-stage projects to enterprise deployments.
8
OpenRouter
WebAPI Free plan Record5.0 Visit OpenRouter suits developers and teams that want one API endpoint for access to multiple AI models and providers.
9
LangChain
APISelf-hosted $39 usage-based Record4.8 Visit LangChain suits developers building model-and-tool agents in Python or JavaScript/TypeScript.
10
LlamaIndex
WebLinuxAPI+1 $50 usage-based Record4.8 Visit LlamaIndex is aimed at developers and enterprises automating document processing and knowledge work.
11
Portkey
WebAPISelf-hosted $49 a month Record4.7 Visit Portkey suits teams building or operating applications that use multiple AI models and need routing, activity monitoring, and prompt management.
12
PromptLayer
WebAPISelf-hosted $49 a month Record4.7 Visit PromptLayer suits engineers and domain experts who need to manage prompts, evaluate changes, and observe AI product activity together.
13
Haystack
APISelf-hosted Free plan Record4.6 Visit Haystack is aimed at AI developers and engineers building modular, transparent systems.
14
LiteLLM
WebAPISelf-hosted Free plan Record4.6 Visit LiteLLM suits platform teams that need a shared API for multiple model providers and controls for usage, routing, and spend.
16
Arize Phoenix
WebAPISelf-hosted Free plan Record4.4 Visit Phoenix suits teams that need to inspect AI application traces and compare evaluation results across versions.
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