Looks like it only takes their proprietary tip design (never seen one using a 3.5mm jack) but they don't have any others for sale yet. There are at least a few different tip designs out there already that don't require tools to replace (Metcal for example) so why not just do that? Unless someone comes out with an adapter, I can't use any of the tips I already own and would need to rely on iFixit for replacements.

Also, can you safely put 100W through a headphone jack? The ones I can find on Digikey that list a power rating seem to max out at 75W but most are well below that. Headphone jacks aren't exactly meant for high power, there is only a small amount of contact between the terminals since there's very little power required for line audio. Obviously big speakers require more power but those use things like XLR, RCA, and wire posts that provide way more contact.

Adding to this, I don't want to use their Chrome-only web app to configure it. Is this thing actually a serial device or is it something that only Chrome can talk to? If the former, just make it an Electron app if you want to be lazy. Can I still run the web app locally if iFixit decides to stop hosting it?

iFixit acts like they are all for open hardware and then go make something that uses proprietary tips and a (likely) closed source web app. I'm glad I could repair it if necessary but seems like a step back from a cheap solder station from Amazon that has a control panel and takes Hakko tips.