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NSIS vs Inno Script Studio: catalog facts
NSIS	Inno Script Studio
Free Free and open source.	Free Free of charge, with optional donations.
Windows	Windows
Produces small installers Script-based logic handles complex installation tasks	Builds Inno Setup scripts through a graphical interface Compiles installers from within the same tool
Requires learning its own scripting language Builds installers for Windows only	Windows only Requires Inno Setup and only produces Inno Setup installers
Downloadable app	Downloadable app
Open source	Closed 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 1, 2026	Official website Full listing and sources Checked October 2, 2026

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