Cost / License
- Free
- Open Source (AGPL-3.0)
Platforms
- Online




MxToolBox is described as 'All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool. Input a domain name or IP Address or Host Name. Links in the results will guide you to other relevant tools and information' and is a website monitoring tool in the network & admin category. There are more than 25 alternatives to MxToolBox, not only websites but also apps for a variety of platforms, including SaaS, Windows, Linux and Self-Hosted apps. The best MxToolBox alternative is Domain Digger, which is both free and Open Source. Other great sites and apps similar to MxToolBox are Pingdom, HetrixTools, techkit.net and DetectZeStack.




Tracks uptime, downtime, and page speed with synthetic and real user monitoring, simulates critical flows, analyzes visitor data by location, device, and browser, sends instant alerts, and provides analytics and reporting to troubleshoot and optimize sites.




HetrixTools offers minute-by-minute global uptime monitoring with 15 free monitors, blacklist alerts for IPs and domains, and server resource tracking. Features a user-friendly design, public uptime pages, white label reports, and continuous updates for enhanced functionality.



![(dark mode) Server Resource Monitoring [1]](https://img.alternativeto.net/s/309x197/jpeg/hetrixtools_672860_full.png)

API suite for website intelligence: tech stack detection (Wappalyzer fingerprinting + DNS + TLS + HTTP headers), SSL/TLS certificate inspection, DNS intelligence with provider enrichment, security header analysis with letter grading, and technology change monitoring.
Monitor your website, server, API, application, service and get notified if your resources have some problems with availability. Upzilla notifies you in Slack, Telegram, Messenger, or by email. Works also as a public status page with subscriptions.




Open-source observability platform providing uptime monitoring, alerts, incident management, status pages for transparency, log and error tracking, performance and security monitoring, automated API testing, on-call rotation, and integrated root-cause analysis for operations teams.





NsLookup shows all the DNS records for the website you're visiting. It has support for popular DNS servers like Google DNS, CloudFlare DNS and OpenDNS, but also local DNS servers all over the world.


SPFtoolbox is an open-source Javascript and PHP app to look up DNS records such as SPF, MX, Whois, and more


It has a more modern and cleaner UI