Checker Services ✅
List of links to the various checkers out there on the web for sites, domains, security etc.
Table of Contents 📖
- Accessibility
♿️ - Browser Testing
🌎 - Cron Jobs
⚡ - DNS
🌐 - Load Testing
🔥 - Mail Configuration
✉️ - Mail Testing
✉️ - Mobile Friendliness
📱 - Security
🔒 - SEO
📈 - Technology Used
🖥 - Uptime Monitoring
📉 - URL Analysis
🌐 - Validation
👌 - Website Performance
🚀 - Contributing
✍️
Accessibility ♿️
| URL | Description | |
|---|---|---|
| https://achecks.ca/achecker | Checks single HTML pages for conformance with accessibility standards to ensure the content can be accessed by everyone. | Free |
| http://www.dasilva.org.br/ | Test sites for accessibility issues (W3C/WAI - WCAG1 and WCAG2 - and E-mag). | Free |
| https://tenon.io/ | Test sites for accessibility issues and offer solutions for problems found. | Free and paid plans |
| https://www.toptal.com/designers/colorfilter | Checks pages for color accessibility. | Free |
| https://wave.webaim.org/ | Gives a detailed report about markup and accessibility concerns including ARIA roles. Provides solutions for problems found. | Free |
Browser Testing 🌎
| URL | Description | |
|---|---|---|
| http://browsershots.org | Test websites on many browser, platforms and devices. | Free |
| https://www.browserstack.com/ | Test your website for cross browser compatibility on real browsers. Instant access to multiple desktop and mobile browsers. | Paid |
| https://www.lambdatest.com/ | Test your website in real browsers on multiple devices. | Free and paid plans |
| https://saucelabs.com | Test apps and websites in many browsers. Can be integrated in CI workflows. | Free trial, free for open source projects, paid |
| https://testingbot.com | Test apps and websites in many browsers. Can be integrated in CI workflows. | Free trial, free for open source projects, paid |
Cron Jobs ⚡
| URL | Description | |
|---|---|---|
| https://cronhub.io/ | Painless cron job scheduler & monitoring service. | Paid |
| https://cronless.com/ | Online Cron Job Replacement and Monitoring Service. | Free |
| https://deadmanssnitch.com/ | Get More Out of Your Cron Jobs. | Paid |
| https://healthchecks.io/ | Simple and Effective Cron Job Monitoring. | Free |
DNS 🌐
| URL | Description | |
|---|---|---|
| https://bgp.he.net | Check IPs, networks, whois, ASNs, prefixes and more. | Free |
| https://www.digwebinterface.com/ | Extensive web interface to dig for doing online DNS / nameserver query. | Free and donations welcome |
| https://dnscheck.pingdom.com/ | Enter a domain name to check if its DNS servers are configured correctly. | Free |
| https://dnschecker.org | Check the DNS propagation of domains. | Free |
| https://dnsdumpster.com/ | Domain research tool that can discover hosts related to a domain. | Free |
| https://dnsspy.io/ | Monitor, validate and verify your DNS configurations. | Free and paid plans |
| https://www.dnsstuff.com/tools | Multiple DNS tools. | Free |
| https://dnsviz.net/ | A DNS visualization tool, incuding a visual analysis of the DNSSEC authentication chain. | Free |
| https://dnswatch.info/ | DNS Lookups & Performance Monitoring. | Free |
| https://www.domainiq.com/tools | DNS, IP, MX tools. | Free and paid plans |
| https://whois.domaintools.com/ | Reverse whois & IP lookup. | Free and paid plans |
| https://ip6.nl | Test if the server supports IPv6. | Free |
| https://ipv6-test.com/validate.php | Test if the server supports IPv6. | Free |
| https://www.ipvoid.com | Multiple IP address tools. | Free |
| https://mxtoolbox.com/SuperTool.aspx | Big collection of useful network tools. | Free |
| https://simpledns.plus/lookup-dg | Trace a zone from the root, to debug delegation and whois | Free |
| https://toolbox.googleapps.com/apps/dig | Easy to use DNS dig tool. | Free |
| https://toolbox.googleapps.com/apps/checkmx | Check the MX records of a domain. | Free |
| https://tools.keycdn.com | Check for http/2 support and find network related issues. | Free |
| https://www.ultratools.com | Big collection of useful network tools. | Free |
| https://www.unlocktheinbox.com/dnstools/mx/ | Checks DNS, WHOIS, Blacklists, and more. | Free, Paid Plans |
| https://www.viewdns.info/ | View DNS, IP, MX information. | Free and paid plans |
| https://zonemaster.net/ | Check, measure and validate DNS. | Free |
| https://www.nslookup.io/ | Global DNS propagation checker. | Free |
Load Testing 🔥
| URL | Description | |
|---|---|---|
| https://loader.io/ | Loader.io is a FREE load testing service that allows you to stress test your web-apps & APIs with thousands of concurrent connections. | Free and paid plans |
| https://loadimpact.com/ | Load test your website, app or API instantly with up to 1.2 million concurrent users. Get unlimited tests with a free trial. | Free and paid plans |
Mail Configuration ✉️
| URL | Description | |
|---|---|---|
| https://email-checker.net | Check emails addresses and lists of email addresses for existence. | Free, paid premium plans |
| https://hunter.io/email-verifier | Test the existence of up to 100 email addresses. | Free, paid plans |
| https://www.mail-tester.com/ | Test the Spammyness of your Emails. | Free |
| https://mxtoolbox.com/blacklists.aspx | The blacklist check will test a mail server IP address against over 100 DNS based email. | Free, paid plans |
| https://www.unlocktheinbox.com/mail-tester/ | Email Authentication and Configuration Tester. | Free, Paid Plans |
| https://verify-email.org | Verify if an email address and the mailbox behind it exists. | Free, paid plans |
| https://www.verifyemailaddress.org | Another email address checker. | Free, paid bulk plan |
| https://tools.verifyemailaddress.io | Test if an email address exists. Also provides an API for developers. | Free, paid API |
Mail Testing ✉️
| URL | Description | |
|---|---|---|
| https://www.unlocktheinbox.com/services/inboxtester/ | Email Inbox Tester - Check over 20+ destinations. | Paid Plans |
| https://www.campaignmonitor.com | Preview emails in over 25 different email clients with the inbox preview feature. | Free trial, paid plans |
| https://www.emailonacid.com | Test emails in over 70 email clients, apps and on different platforms. | Free trial, paid plans |
| https://litmus.com/email-testing | Test the rendering of emails in over 70 email clients and devices. | Free trial, paid plans |
| https://previewmyemail.com | Another provider to test the rendering on many email clients and devices. | Paid plans |
| https://putsmail.com | Send and debug emails in three parts (html, plain text, Apple watch). | Free |
Mobile Friendliness 📱
| URL | Description | |
|---|---|---|
| https://developers.google.com/web/tools/lighthouse/ | Useful for testing PWA's does mobile friendliness etc but not exclusively mobile. | Free |
| https://search.google.com/search-console/mobile-usability | Test how easily a visitor can use your page on a mobile device. Just enter a page URL to see how your page scores. | Free |
Security 🔒
| URL | Description | |
|---|---|---|
| https://www.checkbot.io/ | Browser extension that checks multiple pages at once for web security best practices. Finds HTTPS mixed content issues, insecure password forms and more. | Free and paid plans |
| https://crt.sh | Get an overview and information of assigned TLS certificates. | Free |
| https://csp-evaluator.withgoogle.com | Validate and check the CSP for weaknesses and security issues. | Free |
| https://hackertarget.com | This service provides multiple tools to check websites for vulnerabilities. | Free and paid plans |
| https://www.hardenize.com/ | Harden your server's security. | Free |
| https://hstspreload.org/ | Check if a domain is on the HSTS preload list in browsers and submit them to the list. | Free |
| https://httpschecker.net/ | Track down HTTPS mixed content issues. | Free and paid plans |
| https://internet.nl/ | Check whether your internet is up to date on Internet Standards. | Free |
| https://www.isithacked.com | Check if there are any signs that a website is hacked. | Free |
| https://www.magereport.com | MageReport checks if a Magento instance is outdated and if all security patches are installed. | Free |
| https://observatory.mozilla.org/ | Observatory by Mozilla is a project designed to help developers, system administrators, and security professionals configure their sites safely and securely. | Free |
| https://report-uri.io/home/tools | Multiple useful tools for CSP, HPKP, SRI, headers and certificates. | Free |
| https://securityheaders.io/ | Scott Helme built securityheaders.io after deploying security headers like CSP and HSTS to his own site. He wanted a quick and easy way to check if other sites were using these headers and he figured he'd turn it into a useful tool for everyone to use! | Free |
| https://sshcheck.com | Check the SSH configuration of servers. | Free |
| https://www.ssllabs.com/ssltest/ | This free online service performs a deep analysis of the configuration of any SSL web server on the public Internet. | Free |
| https://tls.imirhil.fr/ | Test the strength of the available ciphers which can be used with HTTPS or SSH. | Free |
SEO 📈
| URL | Description | |
|---|---|---|
| https://www.checkbot.io/ | Browser extension that checks multiple pages at once for SEO best practices. Finds duplicate content, broken links, unfriendly URL names and more. | Free and paid plans |
| https://insites.com/ | Test your websites for everything. Check spelling, broken links, SEO, accessibility and more. | Paid |
| https://nibbler.silktide.com/ | Nibbler is a free tool for testing websites. Enter the address of any website and Nibbler will give you a report scoring the website out of 10 for key areas, including accessibility, SEO, social media and technology. | Free and paid plans |
| https://search.google.com/structured-data/testing-tool/u/0/ | Evaluate your structured data (rich snippets) markup for errors or warnings. | Free |
| https://seomator.com | SEO Audit Tool and website crawler for SEO performance improving with How-to-Fix tips. | Paid |
Technology Used 🖥
| URL | Description | |
|---|---|---|
| https://builtwith.com/ | Find out what websites are Built With. | Free and paid plans |
Uptime Monitoring 📉
| URL | Description | |
|---|---|---|
| https://www.freshworks.com/website-monitoring/ | 50 monitors, 1 min intervals, 5 public status pages free. | Free and paid plans |
| https://tryhexadecimal.com | No-nonsense website monitoring and status page service. | Paid |
| https://ohdear.app/ | 2 sites, 5 euro, uptime, certificate monitoring, mixed content scanning and more. | Paid only |
| https://www.statuscake.com/ | 10 monitors, 5 min intervals, branded public reporting free. | Free and paid plans |
| https://uptimerobot.com/ | 50 monitors, 5 min intervals, 2 months of logs free. | Free and paid plans |
URL Analysis 🌐
| URL | Description | |
|---|---|---|
| https://urlscan.io | Find out what happens when a URL is accessed. | Free |
Validation 👌
| URL | Description | |
|---|---|---|
| https://validator.w3.org/unicorn/ | Checks for proper HTML and CSS markup as well as broken links. | Free |
| https://www.zerobounce.com/ | Checks to see if the email address is valid. | Free, Paid plans |
Website Performance 🚀
| URL | Description | |
|---|---|---|
| https://www.checkbot.io/ | Browser extension that checks multiple pages at once for performance best practices. Finds unminified resources, redirect chains, render-blocking JavaScript and more. | Free and paid plans |
| https://www.debugbear.com/test/website-speed | DebugBear is a site speed testing tool that analyzes page performance and recommends possible optimizations. | Free and paid plans |
| https://developers.google.com/speed/pagespeed/insights/ | PageSpeed Insights analyzes the content of a web page, then generates suggestions to make that page faster. | Free |
| https://gtmetrix.com/ | GTmetrix is a free tool that analyzes your page's speed performance. Using PageSpeed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them. | Free and paid plans |
| https://pageweight.imgix.com/ | See how images affect your page speed. | Free |
| https://testmysite.withgoogle.com | Checks websites for performance issues and provides reports. | Free |
| https://toolbox.googleapps.com/apps/har_analyzer | Analyze the performance with a HAR file. | Free |
| https://tools.pingdom.com/ | Enter a URL to test the load time of that page, analyze it and find bottlenecks. | Free and paid plans |
| https://www.uptrends.com/tools/website-speed-test | Check the performance from 30+ free and 160+ paid checkpoints. | Free, paid plans |
| https://www.webpagetest.org | Website performance test tools with many options. | Free |
| https://yellowlab.tools/ | Online test to help speeding up heavy web pages. | Free |
Contributing ✍️
This started as a small personal project.
Although this project is small, openness and inclusivity are taken seriously. To that end a code of conduct (listed in the contributing guide) has been adopted.