These two websites have quite similar action, interference, Ratio of finding and lookup scores.
Duplichecker provides you facility of seaching on internet by an image by any Keyword, Image url, Devices folder, Online Drives.
  Though it provides you more Ways to upload images, it has an accuracy score of 70/100 as based on 3 experiments.
Access Duplichecker here – Duplichecker
Access Smallseotools here- Smallseotools