Fonts by Fontkey is a free App and Keyboard available for iPhone users. This app lets you customize your social media posts with unique fonts on platforms such as Instagram, Snapchat, Tiktok, Roblox, Twitter, iMessage, Tumblr, and more. The app provides users with a variety of fonts to choose from to add a personal touch to their messages.

The app is easy to use and install. Users can install the keyboard to access it directly from Messages. The app also offers an upgraded version, FontKey+, which provides additional features. However, the app does not provide any contact information for the developer, Timothy Lenardo.

Overall, Fonts by Fontkey is an excellent app for people who want to add a personal touch to their social media posts with unique fonts. The app is free and easy to use, making it a great choice for iPhone users.