You have a logo, a design image file, an old mockup created by someone else, and you're wondering which font they used, so you can replicate or re-use it. Well, there are several font recognition systems by now: https://www.myfonts.com/WhatTheFont/
Tips from myfonts.com:
Scan the image, select the characters of choice, and see all the closest fonts to the one in the image. If it's a proprietary font, they will try to sell it to you (after all that's their business model). But you can always find the closest thing available. For example, if you like Helvetica, but don't want to drop €50 for your personal project, there are free approximations (even if a little far from the real thing) to that font like:
http://www.dafont.com/coolvetica.font
http://www.gust.org.pl/projects/e-foundry/tex-gyre/heros/index_html
Tips from myfonts.com:
Scan the image, select the characters of choice, and see all the closest fonts to the one in the image. If it's a proprietary font, they will try to sell it to you (after all that's their business model). But you can always find the closest thing available. For example, if you like Helvetica, but don't want to drop €50 for your personal project, there are free approximations (even if a little far from the real thing) to that font like:
http://www.dafont.com/coolvetica.font
http://www.gust.org.pl/projects/e-foundry/tex-gyre/heros/index_html
