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Elm vs TypeScript: catalog facts
Elm	TypeScript
Best for: Web developers who want a typed functional language for front ends	Best for: JavaScript developers who want type checking and better editor tooling
Free Free and open source under the BSD-3-Clause licence.	Free Free and open source.
Windows, Command line	Windows, macOS, Linux, Web, Command line
Compiler error messages explain problems and suggest fixes Type inference catches runtime errors at compile time All 4 strengths for Elm Compiler error messages explain problems and suggest fixes Type inference catches runtime errors at compile time Consistent program architecture across projects Online playground for trying the language	Catches type errors in the editor before code runs Outputs plain JavaScript that runs anywhere JavaScript does All 4 strengths for TypeScript Catches type errors in the editor before code runs Outputs plain JavaScript that runs anywhere JavaScript does Online playground for trying it without installing anything Type inference works on existing JavaScript code
Only targets web front ends Interop with JavaScript libraries takes extra work	Adds a compile step to JavaScript projects Type definitions for third-party libraries vary in quality
Downloadable app	Downloadable app, Web application
Open source	Open source
License: BSD-3-Clause	License: Apache-2.0
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for Elm elm-lang.org Catalog checked October 2, 2026	Official website Full listing and sources Sources for TypeScript typescriptlang.org Catalog checked September 24, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.