Spin-echo small-angle neutron scattering (SESANS) is an efficient method to measure particle sizes in real-space, because it eliminates the need for strong collimation of the beam. The fact that the information is in real-space gives some interesting differences with conventional SANS, which is discussed with measurements of the phase transition in a colloidal system from gas via liquid to solid. Structures can be determined over three orders of magnitude in length scale, from 10 nm to 10 μm. We show the results with two different methods to realise SESANS: with π-flipping foils for a steady source with a monochromatised beam and with the neutron spin resonance echo method for a white pulsed source.