Tineye has the best algorithm but Google Images has the largest database and an extra feature or two. n nUsing the URL of a picture of the Eiffel tower as input Google 1 and Tineye 2 both manage to match it to other pictures of the same tower. So Tineye easily match the industry standard on this task. Apetitor like failpletely on this task even when being told that it's a monument. When asked to find pictures similar to the Statoilpany logo Tineye 3 does a great job even finding the logo in pictures taken outside and insidepany buildings. Google on the other hand here relies too much on their -search capability. Preparing the search accordingly. The search term is spot on but by including news reports with this phrase the algorithm also inadvertently includes pictures of the old italic logo. Further down in the list you get many unrelated but replacing the search term with 'Norway' brings up a picture of the Monolith in Vigelandsparken in Oslo. (Shown below) They are both monuments with a similar hue and both towering against a blue sky. Also note the stave church which matches the triangular shape of the Eiffel tower. n nReverse image search is also available in other flavours like SnapTell and Flow which let you snap a picture of a book CD or other products with your cellphone and immediately get ratings and s to websites where you can buy the product. 5 I don't know how well these work in practice. Services like layar and wikitude 67 try to extend this concept to augmented reality again through the lens of a cellphone. 1 s 3 4 s