Constant Contact vs ConvertKit

Constant Contact runs on 6,211 ranked sites (0.1%); ConvertKit on 1,082 (<0.1%).

By rank tier
TierConstant ContactShareConvertKitShare
Top 1,0000<0.1%0<0.1%
Top 10,0002<0.1%0<0.1%
Top 100,00039<0.1%6<0.1%
Top 1,000,0006220.1%76<0.1%
All ranked6,2110.1%1,082<0.1%