ty
An extremely fast Python type checker and language server.
Pricing
Free tier
Flat rate
Adoption
↗RisingLicense
Open Source
Data freshness
Verified · Jul 16, 2026Overview
What is ty?
Ty is an open-source tool that provides rapid type checking for Python code. It serves as a powerful language server, enhancing developer productivity by offering real-time feedback on type errors.
Key differentiator
“Ty stands out as an extremely fast and efficient tool for Python type checking, offering real-time feedback through its language server capabilities.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
API requires Python-specific patterns, TypeScript SDK is community-maintained
v0.1 to v0.2 migration required rewriting chain definitions
Primarily designed for Python, limited support for other languages or IDEs
Type checking can become slow and resource-intensive as project size grows
Fit analysis
Who is it 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
✕ Not a fit for
Projects requiring cross-language support beyond Python
Developers who prefer manual type checking over automated solutions
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
Alternatives
Integrations
Next step
Get Started with ty
Step-by-step setup guide with code examples and common gotchas.