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jGRASP vs Python Tutor: catalog facts
jGRASP	Python Tutor
Free Free to download.	Free Free to use in the browser.
Windows, macOS, Linux	Web
Data structure viewers that draw textbook-style diagrams Control structure diagrams for many languages	Visualises stack frames, pointers and data structures step by step Supports Python, Java, C, C++ and JavaScript
Requires Java 11 or later Eclipse plugin has not been updated since 2020	Suited to short teaching examples rather than large programs Requires an internet connection
Downloadable app	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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