How Noctiso works
Noctiso is a wallpaper app built around one idea: the picture on your screen should match how you want to feel, not just how many pixels it carries. Most wallpaper apps sort by newest, or by tags, or by whatever is trending. Noctiso sorts by mood. The longer you use it, the more the feed leans toward the atmospheres you actually reach for.
Meet the Tuner
The Tuner is the algorithm that runs the feed, and it is the closest thing this app has to a main character. It does not know your name. It has no profile of you in the usual sense. What it has is a quiet, growing sense of your taste: which frames you linger on, which you save, which you scroll past without a second look. From that, it builds a small vector of moods, colours, and tones, and it uses that vector to decide what to show you next.
You can also talk to it directly. Open the Tuner and nudge the feed toward calmer, warmer, darker, or more dramatic, and it adjusts on the spot. The algorithm is meant to be legible, not mysterious.
What atmosphere means here
Every frame is tagged with a short set of moods drawn from a fixed vocabulary: calm, dramatic, dreamy, warm, cold, neon, bright, dark, playful, melancholic. Each also carries a colour signature and a tone. Those tags are what the feed is ordered by. A frame is not just a 4K image of a mountain. It is a calm, cold, blue thing, and it sits near other calm, cold, blue things in the space the Tuner navigates.
How the feed learns
Noctiso is local-first. Your taste vector lives on your device, and the app works fully without an account. A long look is a soft signal. A save is a stronger one. A skip nudges things the other way. On a fresh install the feed starts wide and unopinionated, then narrows as it learns. Nothing about this requires you to sign in, and signing in never gates the wallpapers themselves.
Honest ads, and what premium changes
The free tier shows the occasional ad in the feed. When a frame appears in a position that was paid for, it is labelled SPONSORED, in the same plain way the Tuner labels its own reasons. The honest version of the sentence is this: you did not pay for that position, someone else did, and we would rather tell you than hide it.
Premium removes ads and unlocks the things that genuinely cost more to serve: 4K and portrait downloads, cross-device sync of your saved frames and taste, and custom Tuner presets. The free product is meant to be generous on its own. Premium is for people who want the full resolution and their library in their pocket.
The best way to understand any of this is to use it. Start in the feed, or read the journal for notes on mood, colour, and why a wallpaper can change the shape of a room.