uvloop vs trio

Side-by-side — pricing, strengths, tradeoffs, and fit.

uvloop

Ultra fast asyncio event loop for Python.

trio

A friendly library for async concurrency and I/O in Python.

At a glance

Open SourceFree Tier
● Established·From $0
Open SourceFree Tier
● Established·From $0

Overview

One-liner

Ultra fast asyncio event loop for Python.

One-liner

A friendly library for async concurrency and I/O in Python.

Maturity

Established

Maturity

Established

Open source

✓ Yes

Open source

✓ Yes

Pricing

Free tier

✓ Available

Open source — free to use

Free tier

✓ Available

Open source — free to use

Starts at

$0

Starts at

$0

Model

Flat rate

Model

Flat rate

Enterprise

✕ None

Enterprise

✕ None

Best for

✓ Best for

Developers building high-throughput, low-latency Python applications using asyncio.
Teams working on real-time systems where performance is critical.
Projects requiring significant improvements in event loop speed over the default asyncio implementation.

✓ Best for

Python developers who need to write efficient, asynchronous code.
Teams working on complex, concurrent systems that require structured concurrency.

Not ideal for

✕ Not for

Applications that do not require high-performance event loops and can function well with the standard asyncio library.
Scenarios where the overhead of integrating a new event loop outweighs potential performance gains.

✕ Not for

Projects requiring real-time data processing with sub-millisecond latency.
Developers looking for a cloud-based managed service solution.

Strengths

↑ Strengths

Significantly faster than the default asyncio event loop.
Drop-in replacement for asyncio, minimal code changes required.
Built on top of libuv for high performance.
Supports all features of the standard asyncio library.

↑ Strengths

Simplified asynchronous programming with a clean API.
Support for structured concurrency to manage complex tasks.
Built-in support for timeouts and cancellation.

Weaknesses

↓ Weaknesses

Limited compatibility with certain asyncio features
Dependency on libuv can introduce platform-specific issues
Requires Python 3.7+ which may not be feasible for all projects

↓ Weaknesses

Limited ecosystem and community support
Performance overhead compared to lower-level solutions
Limited language support beyond Python
Documentation can be dense and hard to navigate
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