Twitter Like Character Counter with Pure Javascript – VCountdown
VCountdown is a pure vanilla JavaScript library that display a counter for your text field to count characters down as you seen on Twitter tweet box.
JavaScript & CSS character counter
Character Counter With Visual Feedback – CharCount
CharCount is an ES6 JavaScript library that provides character counters with visual feedbacks for input and textarea elements.
Minimal Character Counter For Text Field – dCounts.js
dCounts.js displays character counter next to your text field and stops typing when you have reached the allowed character limit.