Like when comparing Arial to Helvetica, it’s not always easy to catch the subtle differences between two different typefaces. This is why Tiff has our attention: it’s a simple Web app that lets you visually compare and contrast any two fonts on your computer or in the Google Fonts library.

To the untrained eye, the differences between Helvetica and Arial are tough to catch:

Screen Shot 2013-07-14 at 11.45.28 AM

Comparing Helvetica to Futura, however, reveals significant differences:

Screen Shot 2013-07-14 at 11.45.14 AM

Don’t get me started on Comic Sans and Didot:

Screen Shot 2013-07-14 at 11.45.51 AMTiff is both a light-weight tool for understanding design differences in typefaces, and a utility for comparing typefaces on the Web. Check it out via the link below, and let us know what you think in the comments!

➤ Tiff (via Sidebar)

Pro tip: Click a letter on Tiff to zoom in on the designs)

Image credit: Thinkstock