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NSIS vs Inno Setup: catalog facts
NSIS	Inno Setup
Free Free and open source.	Free The software is free under its open-source licence. Hosting, hardware and external…
Windows	Windows
Produces small installers Script-based logic handles complex installation tasks	A single script file describes the whole installer, and the permissive licence allows commercial use, modification and…
Requires learning its own scripting language Builds installers for Windows only	It builds Windows installers only, and anything beyond the basics means learning its Pascal scripting.
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: Inno Setup License
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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