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We use exceptional field theory to compute Kaluza-Klein mass spectra around${\rm AdS_{3}}$ vacua that sit in half-maximal gauged supergravity in threedimensions. The formalism applies to any vacuum that arises from a consistenttruncation of higher-dimensional supergravity, no matter what symmetries arepreserved. We illustrate its efficiency by computing the spectra of ${\calN}=(2,0)$ and ${\cal N}=(1,1)$ six-dimensional supergravities on ${\rmAdS_{3}}\times S^{3}$ and of type II supergravity on ${\rm AdS_{3}}\timesS^{3}\times S^{3}\times S^{1}$.

Kaluza-Klein spectrometry for ${\rm AdS_{3}}$ vacua