Character Counter With Visual Feedback - CharCount

CharCount is an ES6 JavaScript library that provides character counters with visual feedbacks for input and textarea elements.

Character count / limit for InputTextArea in Visualforce pages

Release: New Color Picker, Tiny Character Counter, Image Rotation and More! - Balsamiq Company News

Live Character Counter using JavaScript - CodexWorld

Character counter for input/text-area · Issue #5132 · vmware-archive/clarity · GitHub

iOS Text Field Built-in Animated Character Counter, by Stan Ostrovskiy

visualforce - Visual Workflow Text Area Character Counter - Salesforce Stack Exchange

Character count display as you type

Character, Letter and Word Counter

UI Design Patterns - Character Limits