Free tools
Useful QA and developer tools. No account.
Twenty working tools that solve a real problem in under a minute. Most run entirely in your browser; URL checks are fetched server-side with SSRF protection and rate limits.
Last updated October 31, 2026
QA
Website QA Checker
Run a free website QA check: HTTP status, title, meta description, headings, images without alt text, links and response time.
server checkHTTP Status Checker
Check the HTTP status code of any public URL, including redirects, response headers and timing.
server checkSecurity Headers Checker
Inspect publicly visible security headers such as CSP, HSTS, X-Content-Type-Options, Referrer-Policy and frame protection.
server checkResponsive Checker
Preview a public URL inside phone, tablet and desktop viewports. Sites that block iframes are linked directly.
runs locallyColor Contrast Checker
Check foreground/background contrast against WCAG AA and AAA thresholds for normal and large text.
runs locallyTest Case Generator
Generate a structured test-case outline from a feature description. Includes happy paths, edge cases, permissions and regression checks.
runs locallyBug Report Generator
Turn observations into a structured bug report with steps, expected/actual behavior, severity and evidence notes.
runs locallyWebsite QA Checklist
An interactive pre-launch checklist covering content, forms, auth, mobile, SEO, accessibility, performance and analytics.
runs locallySEO
Redirect Checker
Inspect a redirect chain hop by hop: status codes, locations and the final destination.
server checkrobots.txt Generator
Generate a robots.txt file with user-agent rules, disallow paths and a sitemap reference.
runs locallyXML Sitemap Generator
Turn a list of URLs into a valid XML sitemap with lastmod dates. Copy or download the result.
runs locallyMeta Tag Checker
Inspect a page's title, meta description, canonical, Open Graph and Twitter card tags.
server checkSEO Preview Tool
Preview how a title, description and URL may appear in Google, X and Facebook before publishing.
runs locallyJSON-LD Generator
Generate structured data for Organization, Article, FAQPage, BreadcrumbList and SoftwareApplication.
runs locallySlug Generator
Turn a title into a lowercase, hyphenated, SEO-friendly slug with optional stop-word removal.
runs locallyDeveloper
Regex Tester
Test a regular expression against sample text with flags, match highlighting and groups.
runs locallyCron Expression Generator
Build a five-field cron expression and read a plain-English explanation of the schedule.
runs locallyUUID Generator
Generate cryptographically random UUID v4 values in your browser. Copy or download as text.
runs locallyJSON Formatter
Format, validate and minify JSON locally. See the exact parse error when invalid.
runs locallyFind the bugs your tests never looked for.
Add your app, run an exploratory scan, and get a release verdict backed by evidence.