Developer tools

Testing & QA tools: the tech stack of 22 real products

Test automation, QA, browser testing and bug reporting.

The typical stack

The leading pick where at least 8 of them show the decision and the leader has at least a quarter of it.

Decision	Most common pick	Share	At default usage
Frontend Framework	React	9 of 15 · 60%	—
Hosting	Amazon Web Services	4 of 11 · 36%	$17/mo · Pay as you go (Lambda + EC2 t4g.small)
Transactional Email	Resend	4 of 11 · 36%	$20/mo · Pro 50k

Monthly bills add up to about $37 at the calculators' default usage, list prices. Set your own usage →

What they chose, decision by decision

Among the testing & QA tools that show each choice, from makers' products and open-source code alike.

Small samples, fewer than 8 products: Backend Framework (Express 5, FastAPI 2) · LLM API (OpenAI API 6, Claude 4) · Product Analytics (PostHog 5, Mixpanel 1) · Payments (Stripe 5, Paddle 1) · Web Analytics (Google Analytics 2, Plausible Analytics 1) · Background Jobs & Cron (Inngest 1, pg-boss 1) · Error Monitoring (Sentry 3)

Testing & QA tools we track

17 makers' products and 5 open-source projects. Makers' products first.

QualGentAI Mobile App QA Tester

ReplayAutonomous app testing

TestMu AIWorld's first full-stack Agentic AI QE Platform.

FetchSandboxAPI integration testing that remembers what breaks

Hamming AI (YC S24)Automated testing for voice agents

QA.techAI testing tool whose agents run through a web app like real users on each release or pull request to find broken flows, for software teams replacing manual QA.

BetterBugs.ioCapture bugs, record sessions, and fix with AI

MCPJamTest, debug, and evaluate your MCP servers.

SignadotK8s-native validation platform for coding agents

TuskTurn your production traffic into tests

OctraficTest your APIs in plain English, straight from the terminal

Tracely-aiTrace-native CI/CD for AI agents — production failures become regression tests that block the PR. Auto-detect, cluster, freeze into hermetic cases, replay in CI for $0.

insomniaThe open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

lighthouseAutomated auditing, performance metrics, and best practices for the web.

mockbinMockbin by Zuplo. Mock, Test, and View HTTP Requests and Responses

crabboxCrabbox: warm a box, sync the diff, run the suite.

microcksThe open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀

scenario Agentic testing for agentic codebases

Hitchhiker a Restful Api test tool

mountebank Over the wire test doubles

Spearmint Testing, simplified. || An inclusive, accessibility-first GUI for generating clean, semantic Javascript tests in only a few clicks of a button.

Swell Swell: API development tool that enables developers to test endpoints served over streaming technologies including Server-Sent Events (SSE), WebSockets, HTTP2, GraphQL, gRPC, and tRPC..