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We report on the first frequency ratio measurement of an $^{115}$In+ singleion clock and a $^{87}$Sr optical lattice clock. A hydrogen maser serves as areference oscillator to measure the ratio by independent optical combs. Overmore than 90 000 seconds of measurement time, the frequency ratio$f_{\rm{In^+}}/f_{\rm{Sr}}$ is determined to be 2.952 748 749 874 863 4(21)with relative uncertainty of $7.0 \times 10^{-16}$. The measurement creates anew connection in the network of frequency ratios of optical clocks.

Frequency ratio of an $^{115}$In$^+$ ion clock and a $^{87}$Sr optical lattice clock