Best Free Testing Tools

Various free network and server tools.

Superseded: As of 2026-08-28, bugbug.io reads: The Free plan includes: Unlimited local test runs, 15 tests, 4 test suites, 1 user, 1 project, AI Test recorder, Components, Edit & rewind, Screenshots, 7 days of tests history. We are not publishing our stored BugBug terms beside it — our own pricing change record, discovered 2026-08-28, names them as the previous ones. Read what we recorded ↓ Note — discovered 2026-08-28: The free plan now has limits: 15 tests, 4 test suites, 1 user, and 1 project. Source ↗

Superseded: As of 2026-09-05, cypress.io/pricing reads: Starter is priced Free with no credit card required, and now includes 10 users, 500 test results / month and 100 prompt execs / month. The compare table prices Team at $799 / year and Business at $3,199 / year, and Cypress Cloud remains free to use for non-commercial open-source public projects. We are not publishing our stored Cypress Cloud terms beside it — our own pricing change record, discovered 2026-09-05, names them as the previous ones. Read what we recorded ↓ Note — discovered 2026-09-05: The Starter tier, which is free, now includes 10 users instead of 50, and carries a new limit of 100 prompt executions/month. Test results stay at 500/month. Source ↗

Code coverage reporting and analytics — Developer plan free for 1 user with unlimited public and private repos, 250 private uploads/month. Always free and unlimited for open-source. PR comments, status checks, patch coverage, bundle analysis included. Integrates with GitHub, GitLab, Bitbucket CI/CD Best for unlimited usage needs.

It's like CodePen but for cross-browser testing. UI-licious lets you write tests like user stories and offers a free platform - UI-licious Snippets - that allows you to run unlimited tests on Chrome with no sign-up required for up to 3 minutes per test run. Found a bug? You can copy the unique URL to your test to show your devs exactly how to reproduce the bug. Best for open source projects and unlimited usage needs.

Open-source Python library that mocks AWS services for testing. Covers 100+ AWS APIs including S3, DynamoDB, Lambda, SQS, SNS, IAM, EC2. Apache-2.0 license. No cloud component, no auth required. Drop-in replacement for boto3 calls in tests

Test your Android & iOS apps on this Cloud Based Android Phone / Tablets emulator and iPhone/iPad simulators directly in your browser. The free tier includes two concurrent session with 30 minutes of usage per month. No limit on app size. Best for unlimited usage needs.

Keploy is a functional testing toolkit for developers. Recording API calls generates E2E tests for APIs (KTests) and mocks or stubs(KMocks). It is free for Open Source projects. Best for open source projects.

Synthetic monitoring — 10 uptime monitors, 1K browser check runs, 10K API check runs/month, 6 locations

Superseded: As of 2026-08-28, webhook.site reads: The free tier allows a maximum of 50 requests. URLs expire. We are not publishing our stored webhook.site terms beside it — our own pricing change record, discovered 2026-08-28, names them as the previous ones. Read what we recorded ↓ Note — discovered 2026-08-28: The free tier has a request limit. Source ↗

Open source browser automation and testing framework. Self-hosted grid for parallel test execution across browsers. No usage limits. Best for open source projects.

Check SSR (server-side rendering) for any URL by visually comparing the server rendered version of the page with the regular version.

Superseded: As of 2026-09-02, artillery.io/pricing reads: The free tier includes 30 reports/month. We are not publishing our stored Artillery terms beside it — our own pricing change record, discovered 2026-09-02, names them as the previous ones. Read what we recorded ↓ Note — discovered 2026-09-02: The free tier now includes 30 reports/month instead of 100. Source ↗

Superseded: As of 2026-08-28, grafana.com/pricing reads: Free tier includes all Grafana Cloud services with limited usage. Specifically, 10k active series per month for metrics, and 50 GB ingested per month for logs, traces, and profiles. 14 days retention. Community support. We are not publishing our stored Grafana k6 Cloud terms beside it — our own pricing change record, discovered 2026-08-28, names them as the previous ones. Read what we recorded ↓ Note — discovered 2026-08-28: The free tier no longer offers 500 VUh. It now offers limited usage of all Grafana Cloud services, with limits of 10k active series per month for metrics, and 50 GB ingested per month for logs, traces, and profiles. Source ↗

A web UI automation tool that functions without the need for selectors. Every developer gets 500 actions per month for free.

Visual regression testing — 5,000 screenshots/month, unlimited users and projects, 30-day build history. Note: BrowserStack browser testing is trial-only; only Percy visual testing has a permanent free tier Best for unlimited usage needs.

Official AWS Serverless Application Model CLI for local Lambda and API Gateway testing. Runs Lambda functions locally via Docker, emulates API Gateway, generates events. Open source (Apache-2.0). No AWS account required for local testing. Supports Python, Node.js, Go, Java, .NET, Rust runtimes Best for open source projects.

A Dashboard for publishing automated test results and a Framework for implementing manual tests as code using GitHub. The service is [free for Open Source](https://github.com/marketplace/testspace-com) and accounts for 450 monthly results. Best for open source projects.

Capture and inspect webhooks from your browser. Forward to localhost, or replay from history. Free to use.

Load behvariour and page speed analysis and optimization tool. The free plan provides 10 tests per day, 5 experiments per week, and 15 GB of maximum ingested data per month.

Open-source libraries for spinning up throwaway Docker containers in integration tests. Supports 50+ modules (databases, message brokers, AWS via LocalStack module). MIT license. Java, Go, .NET, Node.js, Python, Rust. Testcontainers Cloud bundled with Docker subscriptions (100 min/month on Docker Pro)

Test management system for Dev and QA teams. Manage test cases, compose test runs, perform tests, track defects, and measure impact. The free tier includes all core features, with 500MB available for attachments and up to 3 users.

Browser extension that tests if your website follows 50+ SEO, speed and security best practices. Free tier for smaller websites.

Open Source visual testing for developers. Unlimitedprojects, with 5,000 screenshots per month. Free for open-source projects. Best for open source projects and unlimited usage needs.

Automatically create API and load tests by analyzing network traffic. Simulate up to 50 concurrent users for up to 60 minutes for free monthly.

Community Edition: open source load testing tool (Apache 2.0). Self-hosted local execution with multi-language SDKs (Java, Scala, Kotlin, JS, TS). No usage limits. Best for open source projects.

Provides a testing platform that can help teams of all sizes at different levels of testing maturity, including Katalon Studio, TestOps (+ Visual Testing free), TestCloud, and Katalon Recorder.

Visual regression testing by the Storybook team — 5,000 snapshots/month, Chrome-only, unlimited projects and collaborators, Git and CI integrations, UI version tracking Best for unlimited usage needs.

Free Starter plan: 50 max virtual users, 10 tests/month, 20-minute max test duration, 1-week data retention, 1,000 API monitoring requests/month.

Now TestMu AI — the pricing page is titled "TestMu AI (Formerly LambdaTest)". Testing cloud for web and mobile. The pricing page is tabbed by product (KaneAI, Test Manager, Agent Testing, HyperExecute, Performance Testing, Live Testing, Automation, SmartUI) and free availability differs by tab. Test Manager publishes a $0 "Free Forever" plan: unlimited projects, advanced folder management, centralised test case management, unlimited test run creation and management, and 24×7 support; Test Manager Premium is $49/month billed annually. KaneAI Starter is $17/month billed annually. Checked 2026-09-02. Best for unlimited usage needs.

Free on-page SEO website tester. 10 free website crawls per day. Useful SEO learning resources and recommendations on how to improve the on-page SEO results for any website regardless of technology.

Test results reporting and test case management. Integrates with popular test frameworks. Open Source software developers, individuals, educators, and small teams getting started can request discounted and free offerings beyond basic free projects. Best for startups and open source projects.

Superseded: As of 2026-08-28, vaadin.com reads: Vaadin Core is free & open source, Apache 2.0 licensed. Maintenance is available as a paid service for up to 15 years per version. We are not publishing our stored Vaadin terms beside it — our own pricing change record, discovered 2026-08-28, names them as the previous ones. Read what we recorded ↓ Note — discovered 2026-08-28: The page highlights that Vaadin Core is free & open source (Apache 2.0 licensed) and can be used even in commercial projects. It does mention maintenance up to 15 years *per version* as a paid service. Source ↗

Selenium Grid testing with a free plan of up to 4 simultaneous selenium nodes/10 grid starts/4,000 test minutes/month

Superseded: As of 2026-09-02, postman.com/pricing reads: The Free plan costs $0 per month and includes 50 AI credits, an API client, core tools, specs & mock servers, native Git, Collection Runner & Performance Testing runs, manual Flows, and 1,000 API monitoring requests per month. We are not publishing our stored Postman terms beside it — our own pricing change record, discovered 2026-09-02, names them as the previous ones. Read what we recorded ↓ Note — discovered 2026-09-02: The free tier now includes 50 AI credits and has limitations on API monitoring requests (1,000 requests/month). Team collaboration features are no longer removed and require a Team plan ($19/user/month). Source ↗

Open source (MIT) Python-based load testing framework with distributed execution. Locust Cloud free tier: 200 VU-hours/month, max 100 concurrent virtual users. Best for open source projects.

A free tool for developers and API testers to check if an API is CORS-enabled for a given domain and identify gaps. Get actionable insights.

Selenium Browser and Device Testing, [free for Open Source](https://testingbot.com/open-source) Best for open source projects.

A continuous benchmarking tool suite to catch CI performance regressions. Free for all public projects.