How does the electromagnetic force differ from the other three forces?

The only similarity I can find between the strong and weak nuclear forces and the electromagnetic (EM) force is that they are both mediated by exchange particles, in the case of EM it is the massless photon, whereas for the strong force it is the gluon and for the weak force it is the Z and W bosons.

The EM force does not depend on the same properties of matter as the strong and weak forces; the strong force acts on quarks (and other particles composed of quarks) but not on leptons (electrons, for example).

While the electromagnetic force (EM force) can extend its reach over practically infinite distances, the two nuclear forces are limited to the scale of the nucleus and have very short ranges.

Contrarily, gravity and the electromagnetic force exhibit many similarities. Both are inverse-square forces, which means that the force's intensity decreases with the square of the distance between the interacting bodies.

Since they are both conservative forces, moving objects in their presence has the potential to release energy.

There is a difference in the property that a body needs to have in order to experience these forces: mass is the property required for EM force, whereas electric charge is the property required for gravity. Since these are totally independent "fundamental properties" of matter (i.e., their exact causes are unknown), neither a charged body nor an object with charge must necessarily experience gravity.

The electromagnetic force acts on charged particles and is mediated by photons, unlike the other three forces.