Normalized 150Hz differential radio-source counts derived from our LOFAR Boötes observations between 275 μJy and 2 Jy (purple points). Vertical error bars are calculated assuming Poissonian statistics and horizontal error bars denote the flux bins width. Open black circles show the counts uncorrected for completeness and reliability. The purple shaded area displays the 1σ range of source counts derived from 10 non-overlapping circular sectors. For comparison, we overplot the source counts from recent deep and wide low-frequency surveys (Franzen et al. 2016; Intema et al. 2017), as well the source counts derived by Williams et al. (2016) in the Boötes field. In addition, the results of previous deep surveys carried out at 1.4 GHz (de Zotti et al. 2010; Padovani et al. 2015); and 3 GHz (Smolčić et al. 2017a) are scaled to 150 MHz using a spectral index of α = −0.7 (Smolčić et al. 2017a). The inset shows the source counts in the range 0.080 mJy ≤ S_150 MHz ≤ 4 mJy.