Holepunch, formerly hypercore, formerly dat, is a great project. Their main language is js, which makes it difficult to embed into anything but js/ts applications.

Also, they are very principled when it comes to peer to peer purity, whereas iroh is a bit more pragmatic. We use dedicated relays to faciliate hole punching, whereas holepunch tries to use other peers as a temporary relay for hole punching messages.

Another difference is that holepunch have their own DHT, where we have a less decentralised address lookup service by default and use the mainline DHT as a fully p2p alternative.

So TLDR if you are doing js in the browser, holepunch.to might be a good fit. If you work on native mobile apps or embedded devices, iroh will be better since it is pretty frugal. If you work with node.js, both will work. Just evaluate them both and use what works better for you.

E.g. we support tiny embedded devices such as esp32. https://www.iroh.computer/blog/iroh-on-esp32

Thank you so much for the great reply! Answered all my questions - will definitely look closer!