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Pulsar vs Theia IDE: catalog facts
Pulsar	Theia IDE
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source.
Windows, macOS, Linux	Windows, macOS, Linux, Web
It revives the Atom package ecosystem with its own package registry, so the hackable editor and its plugins…	Runs VS Code extensions from Open VSX Available on desktop and online
It is still Electron-based and inherits Atom's memory use and startup time, with a much smaller maintainer team.	Uses Open VSX rather than the Microsoft extension marketplace Smaller user community than VS Code
Downloadable app	Downloadable app, Web application
Open source	Open source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.