The Affine cipher is a very insecure cipher, with the Caesar cipher possibly being the only easier cipher to crack. The Affine cipher is a monoalphabetic substitution cipher, so all the methods that are used to cryptanalyse substitution ciphers can be used for the affine cipher. Affine ciphers can also be cracked if any 2 characters are known.

Therefore the use in modern applications should be avoided if strong encryption is the goal. For purely the sake of obfuscating plain text, it may have use - however better alternatives (like Advanced Encryption Standard, short AES) exist. Thanks to libraries, they are no harder to implement. Therefore affine ciphers should have no use in modern applications.
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