  We study the weak gravity conjecture in non-supersymmetric string theory
setups. Precisely, those are type I string theory with supersymmetry broken \`a
la Scherk-Schwarz and open strings on D branes wrapped around magnetized tori
in type II string theory. We compute long-range interactions between identical
branes at one-loop and compare them to the weak gravity conjecture for
higher-degree forms. In our examples, SUSY breaking generates interactions
between branes, which are not anymore BPS, in such a way that the weak gravity
conjecture is verified. In type I with the Scherk-Schwarz mechanism, the
tension of the branes is reduced by one-loop quantum effects, so that there are
long-range repulsive forces. The correlation of the non-vanishing brane
potential with the presence of a running modulus and of possible D branes bound
states nicely connects to other swampland conjectures. For magnetized branes in
type II strings, we check that non-BPS branes experience a long-range repulsion
whenever the open string spectrum is tachyon-free. Ultimately, the role of
stringy objects in the discussion makes it compelling to further understand
swampland conjectures in strings with broken SUSY, let alone their
phenomenological relevance.
