Every network engineer has a list of tasks they wish had been automated years ago — comparing routing tables by eye in Excel, checking the same thing across forty devices, verifying that a configuration change took effect everywhere it should have.

These tasks are on a list of every netops team. Too small for Ansible, to annoying to ignore. But the engineers who feel the pain rarely have a programming background to address it. The people who write commercial network tools aren't network engineers, and they aim at categories large enough to justify a sales team. The result is a long list of practical, repeatable problems with no solution that fits.

That gap is what this site is for.

How would you compare 40,000 BGP prefixes with 70,000 OSPF routes with guaranteed accuracy? When making a routing change, engineers verify the before-and-after visually scanning two spreadsheets side by side. The tool you'd want - outputs the delta with mathematical precision in under a second — doesn't exist as a product anywhere. I've looked. It exists here.

How would you go about a line-card swap in a Ciena switch that dozens of Junipers depend on? I bet your manager wants before, during, and after "show interfaces" output from every one of them. Each iteration would take you couple hours in CRT or PuTTY. With Checker it's done in seconds.

Everything published here is free for personal and professional use. The only restriction is that you can't sell these tools or include them in a commercial product. Use them anywhere you need, share with colleagues. No accounts, no telemetry, no upsell.

Bug reports, feature requests, and other feedback are very welcome — send them to vk@vkdev.net, I read everything that comes in and promise to reply, time permiting. If you're a network engineer with a recurring problem that nothing on the market solves, tell me about it. Some tools offered here started exactly as this kind of conversation. I feel your pain, have been a network engineer myself for 30 years. All apps here were built for networkers by networker.