Free-tier testing & qa

Exercism

Exercism is an online programming practice platform that provides language tracks, coding exercises, automated feedback, and human mentoring across 83 programming languages. It supports both local CLI-based workflows and an in-browser editor for solving exercises.

Corgea

Corgea is an application security platform that scans code, dependencies, infrastructure as code, containers, and secrets from a single workflow. It includes AI SAST, dependency scanning, IaC scanning, container scanning, secrets detection, and logic/auth scanning in the Free plan.

Gridlastic is a cloud Selenium Grid service that provides private browser test environments on Amazon AWS. Users launch a Selenium Grid in the AWS region closest to their test infrastructure, then point existing test suites at the grid hub without changing their environment.

Killercoda

Killercoda is a browser-based platform for running interactive technical scenarios and playgrounds. The site offers free scenarios, course content, and certification-oriented labs, with separate paid ...

W3Schools

W3Schools is a web development learning platform that provides tutorials, references, exercises, quizzes, code challenges, and certification courses across topics such as HTML, CSS, JavaScript, Python, SQL, and related web technologies.

Loadly.io

Loadly.io is a web-based app distribution platform for iOS and Android builds. It accepts APK and IPA uploads, then generates a distribution link or QR code so testers can download and install builds without using the App Store.

mockerito

Mockerito is a cloud-hosted service for creating custom mock REST APIs. Developers define REST endpoints, JSON response bodies, status codes, response delays, and API key authentication from a dashboa...

micro-jaymock

micro-jaymock is a tiny API mocking microservice that accepts a JSON template in a POST request and returns generated fake JSON data. It supports template fields such as names, addresses, finance values, repeated objects, and other fake-data generators exposed through jaymock.

DKIMValidator.com is a web-based email validation service that accepts messages sent to any address at @dkimvalidator.com and then reports DomainKeys, DKIM, SPF, and SpamAssassin results in one place....

Maxim AI

Maxim AI is a platform for simulating, evaluating, and observing AI agents across the development and production lifecycle. It includes a prompt IDE, prompt versioning, prompt chains, prompt deploymen...

EveryStep Browser Automation

EveryStep Browser Automation is a browser-based web scripting tool from Dotcom-Monitor that records user actions and replays them in a real browser. It supports desktop and mobile browser testing, scheduled script execution, and alerting when errors are detected.

WebSitePulse

WebSitePulse provides a set of free web, DNS, email, and network test tools that run checks against a supplied URL, hostname, IP address, or email domain. The tools verify availability, response time,...

Testspace

Testspace is a test management platform that publishes automation, manual, and exploratory test results into a shared dashboard. It integrates with GitHub Actions, CircleCI, Jenkins, GitLab, Bitbucket...

Whitespace

Whitespace is a browser extension and web service for capturing bug reports with one click. It records page activity such as video playback, logs, network requests, navigations, user actions, and storage changes, then shares the recording as a link.

Mailinator

Mailinator is an email and SMS workflow testing platform for developers and QA teams. It provides public inboxes for disposable email testing, plus private inboxes, private domains, API access, webhoo...

Test TLS

Test TLS is a free online scanner for TLS configuration of servers. It checks a domain name or IP address on a specified TCP port and reports TLS configuration settings, security vulnerabilities, and the server's X.509 certificate.

Appcircle

Appcircle is a mobile CI/CD platform for building, testing, signing, distributing, and publishing iOS, Android, React Native, and Flutter apps. It supports cloud and self-hosted deployment models, wit...

CORS Tester

CORS Tester is a web-based tool for checking Cross-Origin Resource Sharing behavior against an API endpoint. It accepts an API URL, origin, HTTP method, optional credentials, custom headers, and request body, then returns preflight response headers and API server response headers for review.

JSON Swiss

JSON Swiss is a browser-based JSON toolkit that combines formatting, validation, repair, visual table editing, conversion, schema generation, comparison, and code generation in one workflow. The forma...

UI-licious

UI-licious is a browser-based test authoring and execution tool for writing end-to-end UI tests in a simple script format. The page shows a login test for GitHub using commands such as goTo, fill, click, and see, along with a workspace that runs the test and reports step-by-step results.

Codename One

Codename One is an open-source cross-platform framework for building native apps with Java or Kotlin. It compiles shared application logic and UI to native targets for Android, iOS, Windows, Linux, ma...

Trackingplan

Trackingplan is a monitoring service for web and app analytics, ads, consent, and privacy data. It installs via a JavaScript snippet, Google Tag Manager, or iOS and Android SDKs, then observes real user traffic to discover events, properties, pixels, UTMs, and destinations without manual setup.

Core Web Vitals History

Core Web Vitals History is a web tool that fetches historical Core Web Vitals data for a given URL from Google’s CrUX History API. It shows the last 6 months of available data and does not capture or store metrics itself.

Mockaroo

Mockaroo is a random data generator and API mocking tool that produces test data in CSV, JSON, SQL, and Excel formats. It lets developers define schemas with fields such as names, email addresses, IP ...

Free Mail Tester

Free Mail Tester is a web-based email deliverability checker that generates a unique test address, accepts a message sent from a real mail client or campaign tool, and returns a 0–100 score with analy...

Checkbot

Checkbot is a Chrome extension that crawls websites and runs SEO, speed, and security checks across hundreds of pages at once. It reports issues such as broken links, duplicate titles, invalid HTML, insecure pages, redirect chains, mixed content, and other web best-practice violations.

Quant-UX is a web-based research, usability testing, and prototyping tool. It provides a visual editor for creating interactive prototypes, then lets users share a link to collect user feedback, run tests, and review analytics in the same product.

Vaadin

Vaadin is an open-source web framework for building enterprise web applications in Java. It provides server-side UI development with a unified Java stack, allowing developers to build backend logic and user interfaces in the same language without HTML or JavaScript for most application code.

MailCatcher

MailCatcher is a local SMTP server that captures messages sent to it and displays them in a web interface. Developers point applications at smtp://127.0.0.1:1025, then review received mail at http://127.0.0.1:1080/.

PhantomJsCloud is a browser-as-a-service API that runs Chrome-based headless browser instances and returns rendered output as HTML, PDF, JPEG, PNG, plaintext, JSON, or automation results. It supports ...

Marvel

Marvel is a web-based design platform for digital products that combines wireframing, prototyping, user testing, developer handoff, and integrations in one workspace. It supports creating interactive mockups, generating design specs, and connecting workflow tools from low to high fidelity.

HTTP Observatory

HTTP Observatory is a Mozilla tool that scans a website’s HTTP headers and related security settings to check compliance with common security best practices.

Tugboat

Tugboat is a deployment preview platform that creates a working website for each pull request. It connects to GitHub, GitLab, Bitbucket, or generic Git repositories and builds on-demand staging environments with shell access, CLI and API control, centralized logging, and email capture.

Qase

Qase is a test management platform that combines manual test case management, automated test runs, CI results, and requirement traceability in one workspace. It supports test plans, test runs, shared steps, dashboards, queries, integrations, and an MCP server for connecting AI agents to test data.

HostedScan

HostedScan is a vulnerability scanning platform for websites, servers, networks, and APIs. It combines multiple scanners in one service, including Greenbone OpenVAS, Tenable Nessus, OWASP ZAP, Nmap, Nuclei, and SSLyze, and adds scheduling, alerts, reporting, and vulnerability management.

CircleCI

CircleCI is a cloud CI/CD platform for running automated builds, tests, and deployments from source control events. It supports GitHub, GitLab, and Bitbucket integrations, plus execution environments for Docker, Linux VM, Arm VM, Windows VM, macOS VM, self-hosted runners, and GPU workloads.

Shake

Shake is a bug and crash reporting platform for mobile apps and websites. It provides SDKs for iOS, Android, React Native, Flutter, and web, and automatically attaches data such as device model, HTTP ...

Screenshot Scout

Screenshot Scout is a managed screenshot API for developers. It captures screenshots of any URL through a single HTTP request and supports full-page captures, element capture, device emulation, viewport sizing, and pre-capture actions such as clicking or hiding elements.

Lost Pixel is an open-source visual regression testing platform for GitHub-based workflows. It compares screenshots from Storybook, Next.js, Playwright, and page-mode runs to detect UI changes before they reach users.

httpsms.com

httpsms.com is a sandbox web interface for receiving SMS messages on a shared US phone number. It exposes a public inbox that can be used anonymously to view incoming and outgoing text messages in the browser.

TestingBot

TestingBot is a cross-browser and mobile app testing platform that runs automated, manual, visual, and AI-assisted tests on 6100+ real browsers and physical iOS and Android devices. It supports Seleni...

Buddy is a DevOps and platform engineering suite for deployments, CI/CD pipelines, environments, visual testing, tunnels, domains, and cloud hosting. It supports remote deployments to clouds, VPS, bare metal, and CDNs, and provides pipelines defined through UI, YAML, or generated code.

DeepSource

DeepSource is an AI code review platform that analyzes pull requests and existing codebases with static analysis, security checks, code quality rules, coverage signals, and AI-assisted review comments...

Bencher

Bencher is a continuous benchmarking platform that runs benchmark jobs on bare metal hardware and tracks results over time. It supports running benchmarks locally or in CI with the same runner environment, then stores, graphs, and queries results through a CLI and web console.

Buildkite

Buildkite is a CI/CD platform that runs pipelines on self-hosted or Buildkite-hosted agents. It includes workflow controls such as dynamic pipelines, wait steps, block steps, trigger steps, conditiona...

Mockfly

Mockfly is a mock API generator that creates REST API endpoints for frontend development, API testing, and rapid prototyping. It supports generating fake JSON responses with Faker.js, AI-assisted JSON...

Keploy

Keploy is an open-source testing platform that records real API traffic with eBPF and replays it in CI as deterministic regression tests, auto-generated mocks, and production-like sandboxes. It suppor...

LogDog

LogDog is a mobile debugging tool for iOS and Android apps. It collects network requests, logs, analytics events, screenshots, and other app activity from an SDK installed in the application, then streams that data to a web dashboard over WebSocket connections.

mockapi.io

mockapi.io is a REST API mocking service that lets developers create endpoints, define resource schemas, generate custom data, and perform CRUD-style operations through a RESTful interface.

kogiQA

kogiQA is a UI automation tool for web applications that uses natural-language selectors instead of CSS or XPath. The landing page shows examples such as click("New User") and type("Name", "Marc"), an...

Svix

Svix is a webhook infrastructure service for sending, receiving, and testing webhooks through an API and dashboard. It includes webhook dispatch, webhook ingestion, and Svix Play for inspecting and de...

Checkly

Checkly is a monitoring platform for uptime checks, API checks, browser checks, Playwright check suites, status pages, alerting, dashboards, and trace-based root cause analysis. It supports code-first...

Abby

Abby is a type-safe feature flag and remote configuration service with SDKs for React and Next.js. It supports server-side rendering and static site generation, includes environment-specific flag values, and provides optional devtools for debugging feature flags and remote config variables.

PHPSandbox

PHPSandbox is an online PHP sandbox and editor that lets developers create, run, and share PHP projects from the browser. It provides a permanent preview URL for each project, a Monaco-based editor, C...

Mergify

Mergify is a merge automation platform for GitHub repositories. It handles the steps between pull request creation and a green main branch, including merge queues, merge protections, CI observability, flaky test detection, and stacked pull requests.

CurlHub.io

CurlHub is a no-install debugger for API requests. It lets developers inspect API traffic and create a simple request bin without installing local tooling.

BrowserCat

BrowserCat is a hosted headless browser API for Playwright, Puppeteer, and CDP-based automation. It provides browser sessions that connect to BrowserCat’s fleet instead of local infrastructure, with s...

Beeceptor

Beeceptor is a mock API server platform for REST, SOAP, GraphQL, and gRPC endpoints. It lets developers upload OpenAPI, WSDL, GraphQL SDL, or proto definitions, or define responses through a no-code UI, then inspect requests, add matching rules, and return dynamic or stateful responses.

Arize

Arize is an AI and agent engineering platform that combines observability, tracing, evaluation, prompt management, and monitoring for production AI systems. The product includes Arize AX for generativ...

Plurai

Plurai is an AI agent trust platform with products for simulation, evals, guardrails, and simulation-driven optimization. It provides synthetic scenario generation, no-code evaluation creation, guardrail training, and CI/CD integration for validating agent behavior before and during production.

AWS Security Agent

AWS Security Agent is a penetration testing and application security review service that runs in the AWS console. It performs on-demand penetration tests, automated design security reviews, and code s...

Mailtrap

Mailtrap is an email delivery platform with two main products: Email API/SMTP for sending transactional and promotional email, and Email Sandbox for testing emails in staging, dev, and QA environments...

TestMu AI is a cloud testing platform for web and mobile applications. It provides browser-based live testing, automation execution, real device testing, visual testing, test management, and analytics...

BrowserStack

BrowserStack is a cloud testing platform for web and mobile applications. It provides access to real desktop browsers and real iOS and Android devices for manual testing, automation, visual testing, accessibility testing, and test reporting.

Percy

Percy is a visual testing platform for web and mobile applications. It captures screenshots during automated test runs, compares them against baselines, and surfaces visual diffs for review before release.

Statsig

Statsig is a product development platform that combines experimentation, feature flags, product analytics, session replay, web analytics, and infrastructure analytics in one service. It provides SDKs ...

Cypress

Cypress is a browser-based testing platform for JavaScript applications. It provides an open-source Cypress App for writing, running, and debugging end-to-end and component tests directly in the brows...

Chromatic

Chromatic is a frontend UI testing and review platform for teams that runs visual, interaction, and accessibility checks in real browsers. It integrates with Storybook, Playwright, and Cypress, and compares snapshots across browsers and viewports to detect regressions before changes ship.

Flagsmith

Flagsmith is an open source feature flag and remote configuration service. It provides APIs and SDKs for web, mobile, and server-side applications so teams can enable or disable features, target users or segments, and change feature values without redeploying code.

GitLab

GitLab is a DevSecOps platform that combines source code management, CI/CD, security testing, compliance controls, and project planning in one product. The hosted GitLab.com offering includes Free, Premium, and Ultimate plans, plus self-managed and dedicated deployment options.