Comparison of the flux limit and survey area of the Swift AGN and Cluster Survey (SACS) through 2013 July to other soft X-ray surveys from Brandt & Hasinger (2005), adding recent XMM-Newton medium-deep surveys, and the future eROSITA surveys. SACS (solid and dashed lines for point and extended sources) is substantially wider or deeper than many similar existing surveys, and the arrow shows that SACS is approaching the eROSITA deep survey as Swift continues to accumulate data. The solid circles indicate the typical SACS field, 49 square degrees and ﹩4.3\times {{10}^{-15}}﹩ erg cm⁻² s⁻¹ for point sources and 23 square degrees and ﹩7.6\times {{10}^{-15}}﹩ erg cm⁻² s⁻¹ for extended sources, in the 0.2–5 keV band.