https://avelino.run/tags/quic/Recent content in Quic on Thiago AvelinoHugoen-us© AvelinoThu, 25 Jun 2026 15:35:33 -0300https://avelino.run/from-icloud-to-peers/Thu, 25 Jun 2026 00:00:00 +0000https://avelino.run/from-icloud-to-peers/<p>A month ago I wrote about <a href="https://avelino.run/from-paper-to-outliner">building outl on the Kleppmann move-op paper</a>. That post ended with a working sync: a terminal client on macOS and an iOS app, converging over iCloud Drive, no server, no merge dialogs.</p> <p>iCloud was a deliberate shortcut, and I want to be honest about that before I bury it. I had one question to answer first: does this CRDT actually converge across real devices, two separate machines, not two processes on my laptop pretending to be peers? iCloud Drive answered it without me writing a line of networking. Drop the per-actor <code>ops-*.jsonl</code> files in the ubiquitous container, let Apple's daemon push them between devices, watch two replicas merge. A file-pusher I borrowed to validate the algorithm, and for that job it was exactly right.</p>