Best Testing & QA AI Tools in 2026

Helicone

Open source LLM observability via a gateway proxy

Langfuse

Open source LLM observability and evaluation platform

StackHawk

AI-integrated DAST and API security testing

Bruno

Git-native, local-first open-source API client

Apidog

All-in-one AI API design, test, mock, and docs

Braintrust

Evaluation and observability platform for AI products

EchoAPI

API design, testing and debugging with AI assertions

LangSmith

Observability and evaluation for LLM agents

TestSprite

Autonomous QA verification for AI coding agents

Promptfoo

Test and red-team prompts, agents, and RAG apps

Momentic

AI-native end-to-end testing for web and mobile

PromptLayer

Prompt management, evaluation and observability for LLMs

Galileo

Evaluation and observability for LLM apps and agents

QA.tech

Autonomous AI QA agents for end-to-end testing

Checkly

Playwright-based synthetic monitoring as code

Hoppscotch

Open-source browser-first API development ecosystem

Keploy

Open-source AI testing from real API traffic

Confident AI

LLM evaluation and observability from DeepEval makers

testRigor

Plain-English AI test automation, no coding required