Website Uptime Checker
Check whether a website is responding.
Online tools and practical software resources
Useful Online Tools, Software Guides and Digital Utilities
Discover practical resources for website monitoring, search engine optimization, development, online security, productivity and everyday tasks. Browse available tools and read guides that help you work more efficiently online.
Website Monitoring
Monitor website availability, check uptime status, manage website monitors and track server response times using the UptimeRobot API.
Available Online Tools
Open a tool that is currently installed on this website.
DNS Propagation Checker
Compare DNS records across public resolvers.
Broken Link Checker
Find broken links on a website.
Image Compressor
Reduce image file sizes where supported.
Website Speed Test
Review website loading performance.
About Grauhirn
Grauhirn brings together online utilities and software-related information in one place. The directory is organized around practical tasks, making it easier to find tools for managing websites, improving pages, working with data and handling everyday digital activities.