The Shubb capo is BY FAR the best at not creating tuning problems. Its soft, resilient rubber is specially designed to work just like a fingertip, so it doesn't bend the strings over the frets. Its closing action is just like your hand, so it doesn't pull the string off center. As a result, no re-tuning is necessary!
In 2013 the standard line of Shubb capos received its biggest tweak yet: an upgrade on the most popular models - the "C" series nickel plated capos - to include the design features formerly available only on the deluxe, stainless steel models