ty vs mypy

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

ty

An extremely fast Python type checker and language server.

mypy

Static type checker for Python that detects type errors in your code.

At a glance

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

Overview

One-liner

An extremely fast Python type checker and language server.

One-liner

Static type checker for Python that detects type errors in your code.

Maturity

Growing

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 working on large-scale Python projects who need fast type checking and real-time error detection
Teams that require efficient static analysis tools for maintaining high-quality Python codebases
Individual developers looking to enhance their productivity with a powerful language server

✓ Best for

Teams working on complex, large-scale Python applications where type safety is critical.
Developers who want to catch potential bugs before runtime by ensuring type consistency.

Not ideal for

✕ Not for

Projects requiring cross-language support beyond Python
Developers who prefer manual type checking over automated solutions

✕ Not for

Projects that do not require static typing or prefer dynamic typing for flexibility.
Small projects where the overhead of setting up and maintaining a type checker outweighs the benefits.

Strengths

↑ Strengths

Extremely fast type checking for Python code
Serves as a language server providing real-time feedback
Enhances developer productivity with accurate error detection

↑ Strengths

Static type checking for Python code
Integration with popular IDEs and text editors
Support for gradual typing
Extensive documentation and community support

Weaknesses

↓ Weaknesses

Limited integrations with non-Python tools and ecosystems
Performance issues in large codebases

↓ Weaknesses

Steep learning curve for non-Python developers
Frequent breaking changes between versions
Limited support for certain Python features
Performance overhead during large-scale projects
Full ty profile →Full mypy profile →
ty vs mypy | AI Navigator