µWebSockets

Highly scalable WebSocket server & client library for C++.

EstablishedOpen SourceLow lock-in
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Pricing

Free tier

Flat rate

Adoption

↗Rising

License

Open Source

Data freshness

Verified · Jul 16, 2026

Overview

What is µWebSockets?

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.

Key differentiator

“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.”

Capability profile

Capability Radar

Ease of StartEcosystemValueMaturityFlexibilityScale Ready

Honest assessment

Strengths & Weaknesses

↑ Strengths

High performance and low latency for WebSocket connections.medium

Supports both server and client functionalities.medium

Optimized for handling a large number of concurrent connections.medium

Minimalistic design with no external dependencies.medium

Cross-platform support.medium

↓ Weaknesses

Steep learning curve for developers unfamiliar with C++high

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

Limited community and support resourcesmedium

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

Poor documentation for complex featureshigh

While basic usage is well-documented, advanced configurations and less common functionalities have sparse or outdated documentation.

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

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

Fit analysis

Who is it for?

✓ Best for

Developers building real-time applications with C++ who require high performance and scalability.

Teams working on IoT projects needing efficient WebSocket communication.

Applications that need to handle a large number of concurrent connections without compromising on speed.

✕ Not a fit for

Projects requiring WebSocket support in languages other than C++.

Developers looking for a managed service or cloud-based solution.

Cost structure

Pricing

Free Tier

Available

Open source — free to use

Starts at

$0

Model

Flat rate

Enterprise

None

Performance benchmarks

How Fast Is It?

Ecosystem

Relationships

Next step

Get Started with µWebSockets

Step-by-step setup guide with code examples and common gotchas.

View Setup Guide →