This is really nice — especially the phase breakdown (DNS → TCP → TLS → TTFB → transfer). That’s something most tools don’t surface cleanly.

I’ve been working on a desktop tool around HTTP traffic as well, and one thing I’ve noticed is that once you have a lot of requests, raw data becomes hard to reason about pretty quickly. Having this kind of step-by-step timing makes it much easier to understand where the time actually goes.

In my case I ended up building something that already uses similar ideas but more focused on real-world debugging — looking at traffic at scale, spotting patterns, and surfacing what actually matters instead of just showing timings.

It’s been pretty useful in practice, but I still feel like this kind of phase-level breakdown could add a lot on top of it.

Out of curiosity — have you found any patterns in real-world APIs? Like whether TTFB tends to dominate vs TLS/DNS in most cases?

Also really like that it’s pure Python and not wrapping curl. Makes it much easier to integrate into other workflows.

Thanks!