What are some alternatives?
When comparing YayText! and Unicode Text Converter, you can also consider the following products
Sprezz Keyboard - Custom Keyboard Fonts & Themes for iOS8
Shared Text Styles - Easily import and export your Text Styles in Sketch.
Shapecatcher - You need to find a specific Unicode character? With Shapecatcher.com you can search through a database of characters by simply drawing your character into a box. It can find the most similar character shapes for your drawing.
Type Foundry Index - Making type foundries easy to find.
Emoji Translate - Turn your text into emoji automatically
Make Your Drake - Make your own Scorpion cover 🦂