Do I need to install anything?

No. It runs in any modern browser, free, with no account required.

For First Responders · Graph Coloring

Graph Coloring for a call graph

Built for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field. Simulate a call graph live below — adjust the inputs and watch it respond, right in your browser.

Graph ColoringLive

the chromatic number

Controls

Presets

Nodes

Graph coloring assigns colors to nodes so that no edge connects two of the same color, using as few colors as possible. The greedy algorithm colors nodes in order, picking the lowest color not used by a neighbor. It models scheduling exams, assigning radio frequencies, and register allocation in compilers — all cases where conflicting items must be separated.

▶ Run in Python

Data Inspector

Nodes10

Colors used0

Methodgreedy

Governing equation

c (u) \neq = c (v) \forall (u, v) \in E, χ (G) \leq 0

Reading this result: Two colors suffice here, which means the graph has no odd cycle — it is bipartite, the easiest case to schedule with zero conflicts.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

or unlock everything with Pro →

Also for:Students Researchers Educators Engineers Hobbyists & Makers K-12 Students General version →

More with Graph Coloring

Graph Coloring for a road network Graph Coloring for a social graph Graph Coloring for a subway map Graph Coloring for a supply network Graph Coloring for a flight network Graph Coloring for a power grid Graph Coloring for a computer network Graph Coloring for a citation graph

Frequently asked questions

Is this good for first responders?: Yes — this version of "Graph Coloring for a call graph" is framed for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.