  We construct and study several examples of continuous families of AdS$_4$
$\mathcal N = 1$ solutions of four-dimensional maximal gauged supergravity.
These backgrounds provide the holographic descriptions of conformal manifolds
of the dual 3d $\mathcal N = 1$ SCFTs. The solutions we study can be uplifted
to type IIB supergravity where they arise from D3-branes wrapping an $S^1$ with
an S-duality twist. We find the spectrum of low lying operators in the 3d
$\mathcal N = 1$ SCFTs as a function of the exactly marginal coupling and
discuss the structure of the corresponding superconformal multiplets. Using
string theory techniques we also study additional examples of continuous
families of $\mathcal N = 1$ AdS$_4$ vacua in type IIB and massive type IIA
supergravity.
