Hi, I’m Xikai.
§ 01
About
I’m Xikai Liu. I work on App Store Frameworks at Apple, live in the Bay Area, take photos, poke at side projects, and care about creating and exploring things.
§ 02
Highlights
oslabVisit →
Interactive simulations to help you understand how operating systems schedule processes and manage memory.
oslab.xikai.me
leicaVisit →
Discover the history of your Leica camera. Enter your serial number to uncover the model, year of production, and manufacturing details from our database.
leica.xikai.me
§ 03
Photographs
Latest 12 framesSee full archive on Unsplash →
§ 04
Writing
PWA, WebXR, WebGL
Three web platform bets from 2022, looked at again in 2026: PWA survived a near-death experience, WebXR shipped half its modules, and WebGL got replaced before it became dominant.
note
Things to make
A 2022 build list, annotated in 2026 — which ideas survived, which became commodity, which I'd let go.
Blog Post
Quantum Computing
A saved-for-later that I never did read, and an honest note about the bookmark graveyard.
note
Python Handbook
A Python primer I drafted in 2022, structured around a Monash intro-Python syllabus; revisited with 2026 corrections.
Computer Science
Jest .not
A 2022 stub asked what Jest's .not actually is. 2026 answers: a matcher modifier, not a decorator or partial function.
note
Game dev: a path I didn't take
A 2022 'when I have time' game-dev reading list, kept intact, with 2026 notes on Unity's runtime-fee fallout, Apple's pivot to RealityKit and visionOS, and what AI changed for indies.
note
What kind of connection still counts
Notes on the connection drive — Dunbar, Death Stranding, and 2026's quieter question about what's left.
Blog Post
PID
A feedback-control primer from the software side — where PID actually shows up, where we reach for simpler shapes instead, and why.
Blog Post
Bilibili should adapt Ads.
2022 年说 B 站应该开贴片广告 — 四年后的复盘：预测对的部分和没说准的地方。
Blog Post
§ 05