All testing tools

Amplitude

Session Replay

Behavioural product analytics with strong cohort and retention analysis.

Appium

Mobile Testing

The cross-platform standard for native, hybrid and mobile-web automation.

axe-core

Accessibility

The open-source accessibility rules engine almost every other tool is built on.

BrowserStack

Device Cloud

The largest browser and real-device cloud, with 3,500+ device/browser combinations.

Cypress

E2E & UI Testing

Developer-first browser testing with an interactive runner developers actually enjoy.

Datadog Synthetic Monitoring

Monitoring

Synthetic checks correlated with APM traces, logs and infrastructure metrics.

Dependabot

Security Testing

Free dependency updates and vulnerability alerts, built into GitHub.

ESLint

Code Quality

The JavaScript and TypeScript linter every project ends up using.

Faker

Test Data & Mocks

Generate realistic names, addresses, dates and text for fixtures, in any language.

Grafana k6

Load & Performance

Developer-first load testing: JavaScript scripts, Go engine, CI-native thresholds.

Hotjar

Session Replay

Closed to new signups — Hotjar has been absorbed into Contentsquare.

Jest

Unit & Component

The JavaScript testing incumbent: batteries included, snapshots, huge ecosystem.

LaunchDarkly

A/B & Flags

The enterprise feature-flag platform, with experimentation layered on top.

Lighthouse

Accessibility

Google's built-in audit for performance, accessibility, SEO and best practices.

LocalStack

Test Data & Mocks

A local AWS cloud emulator so you can test infrastructure without an AWS bill.

Microsoft Clarity

Session Replay

Free, unlimited session replay and heatmaps. Genuinely free, at any traffic volume.

Mixpanel

Session Replay

Event analytics with fast, self-serve reporting non-analysts can actually use.

Mock Service Worker

Test Data & Mocks

Intercept requests at the network layer so your app code never knows it is mocked.

OWASP ZAP

Security Testing

The free, open-source DAST scanner that attacks your running application.

Playwright

E2E & UI Testing

Microsoft's cross-browser automation library with tracing and auto-waiting built in.

Postman

API Testing

The API platform most developers already have open: requests, collections, tests, mocks.

Renovate

Security Testing

Highly configurable automated dependency updates, free and self-hostable.

Selenium WebDriver

E2E & UI Testing

The W3C standard for browser automation. Every language, every browser, twenty years of it.

Sentry

Monitoring

Error tracking with stack traces, release attribution and now session replay.

Snyk

Security Testing

Developer-first security across dependencies, code, containers and infrastructure.

SonarQube

Code Quality

The static-analysis standard: 30+ languages, quality gates, clean-as-you-code.

Storybook

Unit & Component

Build components in isolation, then test the stories you already wrote.

Testcontainers

Test Data & Mocks

Real databases and services in throwaway Docker containers, per test run.

Testing Library

Unit & Component

Query the DOM the way a user would, not the way the framework does.

Vitest

Unit & Component

Vite-native test runner with instant watch mode and a Jest-compatible API.

WireMock

Test Data & Mocks

The standard HTTP mock server for JVM and beyond: record, replay, stub, simulate faults.

Applitools Eyes

Visual Testing

Visual AI that compares screenshots the way a person would, not pixel by pixel.

Artillery

Load & Performance

YAML or JavaScript load tests that run serverless on AWS at large scale.

axe DevTools

Accessibility

Deque's commercial layer over axe-core: guided manual testing and enterprise reporting.

Biome

Code Quality

Rust-based linter and formatter that replaces ESLint and Prettier, very fast.

BlazeMeter

Load & Performance

Managed cloud execution for JMeter, Gatling, k6 and Selenium scripts.

Bruno

API Testing

Git-native API client that stores collections as plain files in your repo.

Checkly

Monitoring

Monitoring as code: your Playwright scripts, running against production on a schedule.

Checkmarx One

Security Testing

Enterprise application security platform: SAST, SCA, DAST, IaC and API security.

Chromatic

Visual Testing

Visual testing and review built by the Storybook team, for Storybook.

CodeQL

Security Testing

Query your codebase like a database to find vulnerability patterns across the whole repo.

Contentsquare

Session Replay

Enterprise experience analytics that quantify the revenue impact of a UX problem.

Cucumber

E2E & UI Testing

Behaviour-driven development with Gherkin scenarios shared by business and engineering.

Detox

Mobile Testing

Grey-box E2E testing built specifically for React Native.

Dynatrace

Monitoring

Full-stack observability with automatic dependency mapping and AI root-cause analysis.

Firebase Test Lab

Mobile Testing

Google's device farm: run Espresso, XCUITest or a crawler on real hardware.

FullStory

Session Replay

Retroactive analytics: define a metric today and get its history from recorded sessions.

Gatling

Load & Performance

High-performance load testing with a code-first DSL and superb HTML reports.

GitGuardian

Security Testing

Secrets detection across your repositories, history and developer machines.

GrowthBook

A/B & Flags

Open-source feature flags and experimentation that runs on your data warehouse.

Heap

Session Replay

Autocapture analytics: every interaction is tracked, so you never miss an event again.

Insomnia

API Testing

Clean, fast API client with strong GraphQL and gRPC support.

Karate

API Testing

API testing, mocks, performance and UI automation in one Gherkin-based DSL.

LogRocket

Session Replay

Session replay built for engineers: console, network, Redux state and stack traces.

Maestro

Mobile Testing

Mobile UI testing in a few lines of YAML, with tolerance for flakiness built in.

Matomo

Session Replay

Self-hosted web analytics with 100% data ownership and no sampling.

Mend.io

Security Testing

Software composition analysis with automated remediation and licence compliance.

Mocha

Unit & Component

Minimal, unopinionated Node.js test runner you assemble to taste.

Mockoon

Test Data & Mocks

Spin up a realistic mock API from a desktop app in under a minute.

New Relic Synthetic Monitoring

Monitoring

Scripted browser and API monitors included in New Relic's usage-based platform.

Optimizely

A/B & Flags

The original web experimentation platform, now a full digital experience suite.

Pact

API Testing

Consumer-driven contract testing so services can deploy independently.

Percy

Visual Testing

Visual review as a pull-request check, integrated with your existing E2E suite.

PostHog

Session Replay

Open-source product analytics, replay, flags and experiments in one self-hostable platform.

Puppeteer

E2E & UI Testing

Chrome automation library from the Chrome team. Great for scraping, thin for testing.

Sauce Labs

Device Cloud

Enterprise-grade device cloud with deep analytics and strong security posture.

Selenium Grid

Device Cloud

Run your own browser grid on your own infrastructure, for free.

Semgrep

Security Testing

Pattern-based static analysis where rules look like the code they match.

Statsig

A/B & Flags

Feature flags, experimentation and product analytics in one warehouse-friendly platform.

SuperTest

API Testing

In-process HTTP assertions for Node.js apps, without binding a port.

TestMu AI

Device Cloud

Cost-competitive device cloud with an AI-assisted test-orchestration layer.

Unleash

A/B & Flags

Open-source feature management with a privacy-first, self-hosted architecture.

Veracode

Security Testing

Application security as a service, with policy enforcement and compliance attestation.

VWO

A/B & Flags

Experimentation plus heatmaps, replay and surveys in one conversion-optimisation suite.

WebdriverIO

E2E & UI Testing

A batteries-included JavaScript framework over WebDriver and Chrome DevTools.

AB Tasty

A/B & Flags

European experimentation and personalisation platform with strong GDPR positioning.

Allure TestOps

Test Management

Automation-first test management built around the Allure reporting format.

Apidog

API Testing

Design, mock, test and document APIs in one integrated workspace.

autocannon

Load & Performance

One-command HTTP benchmarking for a quick answer about a single endpoint.

AVA

Unit & Component

Concurrent Node.js test runner that isolates every file in its own process.

BackstopJS

Visual Testing

Free, self-hosted visual regression testing driven by a JSON config.

Better Stack

Monitoring

Uptime monitoring, incident management and status pages in one affordable product.

BugHerd

Bug Tracking

Point-and-click website feedback that pins comments to the exact element.

Codacy

Code Quality

Automated code review with security scanning and coverage in the pull request.

ConfigCat

A/B & Flags

Simple, cheap feature flags with unlimited team members on every plan.

Crazy Egg

Session Replay

Heatmaps, recordings and A/B testing in one tool, priced by pageview.

DeepSource

Code Quality

Static analysis with autofix, tuned hard for low false-positive rates.

Eppo

A/B & Flags

Warehouse-native experimentation with a serious statistics engine.

Flagsmith

A/B & Flags

Open-source feature flags and remote config with straightforward self-hosting.

Grafana Synthetic Monitoring

Monitoring

k6-powered checks inside Grafana Cloud, alongside your existing dashboards.

Hoppscotch

API Testing

Lightweight browser-based API client you can self-host in a container.

Jasmine

Unit & Component

Behaviour-driven JavaScript testing framework with no external dependencies.

Kameleoon

A/B & Flags

Experimentation and personalisation with a strong hybrid client/server model.

Level Access

Accessibility

Accessibility platform combined with expert audits and legal-risk support.

mabl

E2E & UI Testing

Low-code, AI-assisted test automation with self-healing locators.

Marker.io

Bug Tracking

In-page bug reporting that attaches console logs, network activity and a replay.

Mockaroo

Test Data & Mocks

Design a realistic dataset in the browser and export it as CSV, JSON or SQL.

Mouseflow

Session Replay

Behaviour analytics with friction scoring and form-drop-off analysis.

NeoLoad

Load & Performance

Enterprise performance testing with strong SAP, Citrix and Oracle support.

Nightwatch.js

E2E & UI Testing

Integrated W3C WebDriver framework with a readable, chainable API.

node:test

Unit & Component

Node.js's built-in test runner. Zero dependencies, already installed.

OpenReplay

Session Replay

Open-source, self-hosted session replay — your user data never leaves your infrastructure.

OpenText LoadRunner

Load & Performance

The original enterprise load-testing suite. Fifty-plus protocols, decades of use.

Pa11y

Accessibility

Command-line accessibility testing for CI, with a dashboard for tracking over time.

Perfecto

Device Cloud

Enterprise mobile and web testing cloud with carrier-network and biometric coverage.

Prism

Test Data & Mocks

Turn an OpenAPI document into a mock server that validates as well as responds.

Qlty (formerly Code Climate Quality)

Code Quality

Maintainability and technical-debt tracking, spun out of Code Climate as Qlty.

Qodana

Code Quality

JetBrains' IDE inspections, running as a CI quality gate.

Smartlook

Session Replay

Session replay with equally strong native mobile app support.

Split

A/B & Flags

Feature delivery with automatic impact measurement on every flag.

Survicate

User Research

Ask the question where the behaviour happened: in-product, email, mobile or link.

TestCafe

E2E & UI Testing

Node.js E2E testing with no WebDriver, no plugins and no browser binaries to manage.

Testim

E2E & UI Testing

AI-assisted authoring with smart locators, now part of Tricentis.

Usersnap

Bug Tracking

Combined bug reporting and product-feedback capture with survey tooling.

Argos

Visual Testing

Open-source visual testing with a GitHub-native review experience.

Autify

E2E & UI Testing

AI-maintained web and mobile tests aimed at teams with no automation engineers.

Convert Experiences

A/B & Flags

Privacy-focused A/B testing with unlimited experiments and no data selling.

HeadSpin

Mobile Testing

Global device infrastructure focused on performance and real network conditions.

IBM Equal Access Toolkit

Accessibility

Free accessibility checker and rules engine from IBM, with a strong developer extension.

Kobiton

Mobile Testing

Real-device cloud with the option to connect your own devices to the same platform.

Lost Pixel

Visual Testing

Being sunset: open-source visual regression whose team has joined Figma.

QA Wolf

E2E & UI Testing

Outsourced E2E coverage: they write and maintain your Playwright suite.

Snaplet Seed

Test Data & Mocks

Generate a coherent, schema-aware seed database for local development and tests.

Step CI

API Testing

Open-source API testing configured entirely in YAML, built for pipelines.

TestingBot

Device Cloud

Straightforward, keenly priced Selenium and Appium grid from a small European vendor.

Virtuoso QA

E2E & UI Testing

Natural-language authoring with self-healing, aimed at enterprise QA teams.

TestDriver

E2E & UI Testing

Vision-model E2E testing that drives a real desktop instead of querying the DOM.