Technically, this isn't an ISO customizer, but it’s the best alternative for people who find NTLite too risky. Instead of modifying the ISO before installation, you run this script on a fresh install of Windows.

Users who want to customize the look of Windows as much as the performance.

4. Chris Titus Tech’s Windows Utility (Post-Install Optimization)

It’s safer. If you remove a component in NTLite and it breaks Windows, you have to reinstall. With this utility, you can toggle features, install essential apps, and "de-bloat" with a single PowerShell command.

It’s worth noting that NTLite does have a free version, but it is heavily restricted (many "removals" are locked). If you find yourself hitting a paywall in NTLite, is generally the most logical jump for feature-parity, while Rufus is the best for those who just want to bypass Windows 11’s annoying hardware checks. Final Verdict: Which one should you choose? For the "Pro" experience for free: MSMG Toolkit. For bypassing Windows 11 requirements: Rufus. For a modern, user-friendly UI: WinReducer.