Rainy Keyboard is a free personalization app developed by Jack Martin Apps - My Photo Keyboard - Picture for Android. With this app, you can customize the keyboard background with photos from your gallery or camera. The app also comes with a Rainy Keyboard Theme that includes sub-themes related to rainy backgrounds.

One of the unique features of Rainy Keyboard Theme is that it automatically changes every day of the week, providing a fresh and exciting experience every time you use your keyboard. The app also offers over 1500 emojis, emoji art, and prediction on words to make chatting with friends more fun.

Rainy Keyboard also includes other useful features, such as auto spell check, next word prediction, and the ability to swipe your finger on the keyboard for fast typing. It supports over 50 languages, 60 font styles, and provides a template facility for fast sharing. You can also directly search on Google or share contacts from the keyboard.

Overall, Rainy Keyboard is a great personalization app that allows you to make your keyboard beautiful and stylish. The app also provides additional features to enhance your typing experience and make chatting more enjoyable.