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MMKV vs AsyncStorage in React Native

A Comparative Analysis

May 01, 2024

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MMKV vs AsyncStorage in react native


React Native developers often face the dilemma of choosing the right storage solution for their applications. Two popular options for storing data are MMKV and AsyncStorage. In this article, ‘MMKV vs AsyncStorage in react native’, we’ll conduct a comparative analysis of these two libraries to help you make an informed decision based on your project requirements.

Understanding AsyncStorage :

AsyncStorage is a built-in storage solution provided by React Native. It offers a simple API for storing small amounts of data asynchronously. AsyncStorage is suitable for scenarios where data persistence is required but performance is not a critical factor.

1. Pros of AsyncStorage:
  • Simplicity: AsyncStorage provides a straightforward API for storing and retrieving data. 
  • Built-in: Since it’s part of React Native, AsyncStorage requires no additional dependencies.
2. Cons of AsyncStorage:
  • Performance: AsyncStorage may suffer from performance issues, especially when dealing with large datasets. 
  • Limited Scalability: It’s not optimized for handling large-scale data storage needs.

Introducing MMKV:

MMKV, developed by WeChat, is a high-performance key-value storage library designed for efficient data storage and retrieval. It leverages maps to manage memory, offering faster read and write operations compared to AsyncStorage. MMKV is suitable for applications requiring faster data access or dealing with large amounts of data.

1. Pros of MMKV:
  • Performance: MMKV outperforms AsyncStorage in terms of speed and efficiency, making it ideal for high-performance applications. 
  • Scalability: MMKV is optimized for handling large-scale data storage needs, offering better scalability compared to AsyncStorage.
2. Cons of MMKV:
  • External Dependency: MMKV requires adding an additional dependency to your project, which may increase complexity. 
  • Learning Curve: While MMKV provides excellent performance, it may require some learning to use its advanced features effectively.

Comparative Analysis:

Let’s compare AsyncStorage and MMKV based on various factors: 

1.  Performance: MMKV excels in terms of performance, offering faster read and write operations compared to AsyncStorage. 

2. Scalability: MMKV is better suited for handling large-scale data storage needs, providing better scalability than AsyncStorage. 

3. Simplicity: AsyncStorage wins in terms of simplicity, offering an easy-to-use API out of the box. 

4. Built-in Support: AsyncStorage has the advantage of being a built-in solution in React Native, whereas MMKV requires adding an external dependency.


In conclusion, both MMKV and AsyncStorage are valuable storage solutions in React Native, each with its own set of advantages and disadvantages. If you prioritize performance and scalability, MMKV is the preferred choice. However, if simplicity and built-in support are more important to you, AsyncStorage may be the better option. 

Ultimately, the choice between MMKV and AsyncStorage depends on your project requirements and priorities. Consider factors such as performance, scalability, simplicity, and ecosystem compatibility when making your decision.