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A compact platform for cold atoms opens a range of exciting possibilities for portable, robust and accessible quantum sensors. In this work, we report on the development of a cold-atom microwave clock in a small package. Our work utilises the grating magneto-optical trap and high-contrast coherent population trapping in the lin    ⊥   $\perp $lin polarisation scheme. We optically probe the atomic ground-state splitting of cold  87 Rb atoms using a Ramsey-like sequence whilst the atoms are in free-fall. We have measured a short-term fractional frequency stability of5  ×    10   −  11    /   τ    $5{\times}{10}^{-11}/\sqrt{\tau }$with a projected quantum projection noise limit at the10   −  13    /   τ    ${10}^{-13}/\sqrt{\tau }$level.

Towards a compact, optically interrogated, cold-atom microwave clock