---
title: "What is difference in class extension and class category ?"  
description: "What is difference in class extension and class category ?"  
author: "Elena Glibart"  
published: 2017-01-07  
updated: 2020-09-17  
canonical: https://www.mindstick.com/interview/23146/what-is-difference-in-class-extension-and-class-category  
category: "ios"  
tags: ["iphone", "ios"]  
reading_time: 1 minute  

---

# What is difference in class extension and class category ?

Class extension is similar to a category but it can added to in a class that have source code at compile time but for class category you can implement it without source code of original class.

## Answers

### Answer by Elena Glibart

Class extension is similar to a category but it can added to in a class that have source code at compile time but for class category you can implement it without source code of original class.


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Original Source: https://www.mindstick.com/interview/23146/what-is-difference-in-class-extension-and-class-category

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