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Inno Script Studio vs NSIS: catalog facts
Inno Script Studio	NSIS
Free Free of charge, with optional donations.	Free Free and open source.
Windows	Windows
Builds Inno Setup scripts through a graphical interface Compiles installers from within the same tool	Produces small installers Script-based logic handles complex installation tasks
Windows only Requires Inno Setup and only produces Inno Setup installers	Requires learning its own scripting language Builds installers for Windows only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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