The best alternatives to Cent are Off Of, Percentages, and Percentage Calculator. If these 3 options don't work for you, we've listed a few more alternatives below.
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Blaze— Create beautiful 1-click content in your brand style with AI
Site I hacked together a few weeks ago. It is a very simple tool that allows users to solve problems that involve percentages. The goal of the site is to gain long tail keyword traffic from Google and other search engines.
pourcentag.es is a simple and efficient percentage calculator. It uses real sentences to be as intuitive as possible and gives results in real time, as you're typing. It has a beautiful neuomorphic design with an automatic dark mode and language switching.