Is there a real-time inline field validation module? Currently I'm using the Clientside Validation module for validation of my fields, but I want to be able to have per field real-time validation. Like a check thingy showing if it's correct or a small inline error when there's an error in there. I searched a bit and couldn't find a proper module.

Is there a module for that?
Use Rich Form Module. 

This module gives you a framework to easily make client side and server side validation in the same time. It increases the validation features of the Drupal Form API (FAPI). If you want to have a powerful tool for creating custom validation logic to any text field, without writing a tons of codes, this module is for you!