µWebSockets

What it is

µWebSockets is a high-performance WebSocket server and client library written in C++. It is designed to handle large numbers of concurrent connections efficiently, making it ideal for real-time applications that require low latency and high throughput.

µWebSockets stands out as one of the most performant and scalable WebSocket libraries available, specifically optimized for high-frequency data transmission scenarios where low latency is critical.

When it fits — and when it doesn’t

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

1. 01

   Steep learning curve for developers unfamiliar with C++

   µWebSockets is written in C++, which can be challenging for developers more accustomed to higher-level languages like Python or JavaScript.

2. 02

   Limited community and support resources

   Compared to more popular libraries, µWebSockets has a smaller user base, leading to fewer tutorials, examples, and community contributions.

3. 03

   Poor documentation for complex features

   While basic usage is well-documented, advanced configurations and less common functionalities have sparse or outdated documentation.

4. 04

   Platform-specific issues may arise due to C++ dependencies

   C++ libraries can be sensitive to the underlying operating system and compiler versions, leading to potential build and runtime issues on different platforms.

What it does well

• High performance and low latency for WebSocket connections.

• Supports both server and client functionalities.

• Optimized for handling a large number of concurrent connections.

• Minimalistic design with no external dependencies.

• Cross-platform support.

Pricing

Free tier

YesOpen source — free to use

Paid from

$0

Model

Flat rate

Enterprise plan

No

Pricing not independently confirmed — check the vendor’s page.