--- title: ty: An extremely fast Python type checker and language... description: Astral announces the Beta release of ty, a Rust-based Python type checker and language server that's 10-60x faster than mypy and Pyright without caching. Built... canonical: https://daily.dev/posts/ty-an-extremely-fast-python-type-checker-and-language-server-ddtwcgcrp twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: ty: An extremely fast Python type checker and language server | daily.dev og:description: Astral announces the Beta release of ty, a Rust-based Python type checker and language server that's 10-60x faster than mypy and Pyright without caching. Built... og:url: https://daily.dev/posts/ty-an-extremely-fast-python-type-checker-and-language-server-ddtwcgcrp og:image: https://api.daily.dev/og/posts/DdtWcGCRp.png og:image:alt: ty: An extremely fast Python type checker and language server og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # ty: An extremely fast Python type checker and language server **[Hacker News](https://daily.dev/sources/hn)** · 6 min read · 11 upvotes · 0 comments ## Summary Astral announces the Beta release of ty, a Rust-based Python type checker and language server that's 10-60x faster than mypy and Pyright without caching. Built with an incremental architecture for extremely fast live updates in editors, ty features advanced type system capabilities including first-class intersection types, sophisticated type narrowing, and reachability analysis. The tool includes a diagnostic system inspired by Rust's error messages and supports all standard language server features. Available via uv or VS Code extension, ty is open source under MIT license and aims for a Stable release next year. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Python type checker ty now in beta](https://daily.dev/posts/python-type-checker-ty-now-in-beta-pskn5yajb) · InfoWorld · 25 upvotes · 0 comments - [ty](https://daily.dev/posts/ty-ydfunckai) · Lobsters · 19 upvotes · 1 comments - [How to Switch to ty from Mypy](https://daily.dev/posts/how-to-switch-to-ty-from-mypy-vyxs88cow) · Planet Python · 0 upvotes · 0 comments --- Tags: [#python](https://daily.dev/tags/python), [#rust](https://daily.dev/tags/rust), [#vscode](https://daily.dev/tags/vscode) [View this post on daily.dev](https://daily.dev/posts/ty-an-extremely-fast-python-type-checker-and-language-server-ddtwcgcrp) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"ty: An extremely fast Python type checker and language server","url":"https://daily.dev/posts/ty-an-extremely-fast-python-type-checker-and-language-server-ddtwcgcrp","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/ty-an-extremely-fast-python-type-checker-and-language-server-ddtwcgcrp"},"datePublished":"2025-12-16T22:48:21.451Z","dateModified":"2025-12-16T22:48:48.550Z","description":"Astral announces the Beta release of ty, a Rust-based Python type checker and language server that's 10-60x faster than mypy and Pyright without caching. Built...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/593266f626fcb87c4167e216eed0c11e?_a=AQAEulh","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/593266f626fcb87c4167e216eed0c11e?_a=AQAEulh","isAccessibleForFree":true,"articleSection":"Hacker News","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Hacker News","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/hn","url":"https://daily.dev/sources/hn"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/ty-an-extremely-fast-python-type-checker-and-language-server-ddtwcgcrp","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":11},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"python,rust,vscode","timeRequired":"PT6M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hacker News","item":"https://daily.dev/sources/hn"},{"@type":"ListItem","position":3,"name":"ty: An extremely fast Python type checker and language server"}]} ```