Visual programming with a timeline

Patch audio, video, 3D and sensors with nodes, then organise them in time. ossia score is free and open-source, and it runs your Pure Data patches.

Download ossia score 3.9.0 Try it in your browser Read the documentation

Free and open-source (GPLv3) · Windows, macOS, Linux, Raspberry Pi and web browser

ossia score mixes two ways of working: a nodal patcher, where you connect objects with cables, and a timeline, where the patch itself can change over time. You can switch between both views at any point.

What you can do

Patch audio, video, 3D and control objects with cables, including feedback loops; hundreds of objects for MIDI, strings, files, math, analysis and synthesis.
Program when patching is not enough: JavaScript, Faust for audio DSP, ISF and compute shaders for graphics, C++ compiled on the fly, math expressions (JavaScript, Faust).
Run Pure Data patches directly inside a score through libpd (Pure Data).
Host plug-ins: VST, VST3, CLAP, LV2 and JSFX (audio plug-ins).
Computer vision and AI: objects ported from cv.jit (blobs, optical flow, contours, homography), ONNX models for pose detection and recognition.
Build interfaces with QML and score’s own widgets, and package a project as a standalone app (custom UI, custom apps).
Edit while it plays: drop a process on a cable or a node to insert or replace it without stopping, and live-code JSFX effects.
Interactive machine learning: train a classifier or a regressor by example, and analyse gestures (PCA, clustering, correlation) (classifier, gestures).
Instruments and effects included: synthesizers, drum machines, a sampler, a granulator and the Airwindows effects (see live music).
GPU programming: compute shaders, raster pipelines with instancing, and your own render pipelines (compute shaders).
About thirty skins, including colour-blind-safe and high-contrast ones.

Switching between the timeline and the nodal view in ossia score

Patching needs, and how ossia score answers them

What you need	How ossia score does it
A free patching environment on Windows, macOS and Linux	Open-source (GPLv3), with audio, video, 3D and control objects.
Organising a patch in time: scenes, sections, show control	The patch lives inside a timeline, with scenes, cues, triggers and conditions.
Reusing existing Pure Data patches	ossia score runs them directly, and adds a timeline, video and 3D around them.
Generative visuals and interaction with little or no code	Shaders, computer vision and ONNX objects, with JavaScript, Faust or C++ when needed.
Exposing your own programs and patches	libossia makes Max and Pure Data patches, openFrameworks, Processing, Unity or Python programs controllable from score.

Download ossia score 3.9.0 Try it in your browser Read the documentation

Free and open-source (GPLv3) · Windows, macOS, Linux, Raspberry Pi and web browser

More ways to use ossia score

Stage and music

Show control — Cues, scenes and timecode for theatre, concerts and events.
Live electronic music — Synths, drum machines, sampler, step sequencers and plug-ins, in sync with MIDI clock, timecode and visuals.
Spatial audio — DBAP, GBAP and trajectories over any loudspeaker layout, up to 1024 channels, and control of spatialisation renderers.
Dance and interactive theatre — Pose detection, depth cameras, sensors and tracking drive sound, video and light, inside cues and scenes.
Contemporary music and live electronics — Interactive scores that wait for the performers, cues from pedals, live processing and spatial sound.

Video and light

Video, mapping and VJing — Video playback, multi-projector mapping, shaders, 3D and NDI, synchronised with sound and light.
DMX lighting and LEDs — Art-Net, sACN and DMX USB with a fixture library, LED pixel mapping, all in sync with sound and video.
Generative art — Shaders, 3D, gaussian splats and live coding, performed live or rendered frame by frame.
Recording and streaming — Cameras, SDI, NDI and SRT in; ProRes or MP4 recording, RTMP streaming and NDI or Spout out.

Spaces and experiences

Interactive installations — Sensors, cameras and tracking, sound and video, running unattended on a PC or a Raspberry Pi.
Museums and exhibitions — Exhibits that run all day without staff, with monitoring, a staff control panel and kiosk apps.
Escape rooms and attractions — Puzzles, props and sensors driving sound, video and lights, with game logic and a game master panel.
Kinetic art and robotics — Motors, pumps and robots written on a timeline, reacting to sensors, in sync with sound, video and lights.

Tools and research

OSC, MIDI and DMX timeline — Automate any OSC, MIDI or DMX parameter on an interactive timeline, with triggers and conditions.
Real-time AI — Pose detection, depth from a webcam, real-time image generation, language models and machine learning by example, run locally.
Protocol bridge — Convert between MIDI, OSC, DMX, MQTT, serial, HTTP and Bluetooth LE, with mapping and filtering, always on.
Research, sonification and biosignals — LSL, HDF5 and CSV data, sonification, biofeedback, and sessions recorded and replayed on a timeline.
Teaching and workshops — One free tool for sound, video, light, sensors and code, on every OS, in the browser and on Raspberry Pi.
Custom apps — Package a project with your own interface as an app for Windows, macOS, Linux or the web.

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