CityScape Audio Visualizer

CityScape Audio Visualizer builds an infinite, procedurally generated city where windows pulse, the grid is in sync to the bass, and revolving stars twinkle to the beat—tuned with quick Performance Profiles and lots of customization options.

Audio-reactive, procedurally generated skyline visualizer with performance presets and a selection of customization options. Runs full-screen or in a resizable window. Uses your PC's audio to visualize any type of audio. 

A free web-only version of the radio mode is also available to try at sammysindieradio.com/visualizer. 

Features

Procedural City, Endless Looks

• Every launch is unique. Buildings, blocks, and window grids are generated on the fly—no looping video, no canned scenes.

• Audio-reactive windows: Light, flicker, and intensity respond to your soundtrack in real time.

• Supports the audio directly from your PC - no need install anything else.

• Works fully offline, aside from the optional Radio Mode.  

Performance Profiles (one-key controls)

• Preset performance profiles balance the effects for a wide variety of hardware. 

• Instantly switch profiles with ◄ / ► Arrow Keys. Changes are applied instantly and automatically, no reset needed. 

Deep Customization (make it yours)

• Visual feel: window brightness/decay, skyline spread, silhouette height variance, glow/tint, vignette, UI scale, and more.

• Behavior: responsiveness/sensitivity, smoothing, peak handling, idle behavior.

• Display: windowed or fullscreen (F11 or Shift + F).

• A Control Panel you can pop open from the top-left hotspot or Shift + C.

Two Ways to Listen

• PC Audio Mode: visualize any audio your computer is playing (games, YouTube, Spotify—anything).

• Radio Mode: current full support for one online radio station (Sammy's NYC Indie-Electro Radio). More stations can be added if users request them (I'll need the streaming URL). 

How it works

CityScape Audio Visualizer uses a lightweight, GPU-accelerated renderer and a real-time audio analysis pipeline. The city layout and window grids are procedurally generated, then driven by amplitude/energy across bands. Profiles tweak scene complexity under the hood, so you get a stable frame rate without hand-tuning 50 sliders.

Controls (quick reference)

• Top-left hover or Shift + C – Control Panel

• ▲ / ▼ – Adjust audio sensitivity

• ◄ / ► – Switch Performance Profiles

• F11 or Shift + F – Fullscreen

• Shift + T – Reopen Welcome tips

• Radio Mode: Shift + ▲/▼ controls volume

(Tooltips inside the app show these as well.)

Who it’s for

• Music lovers who want something more alive than a looping video.

• Streamers and DJs who need reliable performance with a look that adapts to the sound.

• Anyone who enjoys tinkering—flip a preset and then fine-tune to taste.

Roadmap 

• Additional visualizer elements may be added. Suggest them in the comments and I'll try to make them happen

• More color/tone themes and overlay options

• Additional radio stations in Radio Mode can be added at users request 

Requirements

• OS: Windows 10/11

• GPU: Any modern integrated or discrete GPU

• RAM: 4 GB+

• Input: Keyboard & mouse

• Internet: Only required for Radio Mode streaming

Notes & Support

• No music is included. In the default PC Audio Mode the app reacts to whatever you play on your system; in Radio Mode it plays the current configured stream.

• If you run into issues, just drop a comment on the itch page—I’ll help.