Great to have all of these tools in one place. I use at least half of these tools on a regular basis, but each from different websites. I used the SEO auditor on my website and got some good insight with warnings on the length of the Title tag. One idea, for the Network section, I used to work with TCP captures and they are sometimes really challenging to read (tracking a message with it's acknowledgement, a 3-way handshake connection protocol, etc.). A tool that analyzes and shows a readable copy of a TCP capture would be great, something similar to Wireshark but easier to read and understand. Great work!

Very cool! There's a bunch of tools I regularly use, but usually just pick the first result of the search engine. Might warrant a bookmark :)

Nitpick: the image compressor page seems to show the instructions for the IP address converter.

Having everything from JWT decoders and PDF tools to data and unit converters in a single, zero-latency vanilla JS suite replaces about twenty different bookmarks. Instant bookmark for me.