Write Me seems to be a decent app to learn different scripts, especially for lesser studied languages like Bulgarian and Khmer. Each character in a given script is accompanied by a sample word that contains those characters. You will watch an animation of the proper stroke order before having the opportunity to write by yourself. Later you will be quizzed in various formats to help you retain what you have learned.
Write Me seems to support the act of writing and recognizing individual characters — however, similar to Write It! and Scripts by Drops, it doesn’t seem to give much background about each script. You won’t learn that Korean Hangul consists of morphosyllabic blocks, or that its consonants are pronounced differently at the beginning of a word than in the middle. You also won’t learn that Khmer stacks consonant clusters, or that you are writing Hebrew cursive script but receiving a print script prompt (which gets confusing without a little research).
You can test out Write it! (free), Write Me (paid lifetime access), and Scripts by Drops (monthly or lifetime access) to see which app best suits the language you are learning. For more comprehensive apps, check out Eggbun for Korean or Skritter for Chinese and Japanese.