Unlike many other cryptographic libraries, Themis is a high-level, easy-to-use and hard-to-misuse library (“boring crypto”).
Themis is made by cryptographers, but is targeted at developers, so it hides cryptographic details under the hood (“secure by design”).
Themis helps to build both simple and complex cryptographic features easily, quickly, and securely. Themis allows developers to focus on the main thing: developing their applications.