Night Owl — Codex app theme

Sarah Drasner built Night Owl for a specific person: someone working at night, in a dim room, possibly with imperfect color vision. Those constraints became design decisions. The base is a deep ocean blue, #011627, the contrast is genuinely high rather than fashionably low, and the accent hues were picked to stay distinguishable under common forms of color blindness — a checklist most themes never run at all.

The result behaves beautifully in a dark room. Text floats on the blue-black with real separation, so a 1am agent session stays readable at lower screen brightness than most themes tolerate — you can dim the monitor a full notch and lose nothing. The peach strings and lilac keywords are unusual choices that turn out to be easy to tell apart at a glance, which is the accessibility work quietly doing its job.

Skip it for sunny rooms — the deep base is tuned for low ambient light and looks its flattest at noon, the exact opposite of its home turf. But if your agent hours reliably start after dinner, Night Owl is one of the few themes that was designed for that shift rather than merely marketed to it.