The SketchUcation PluginStore is the official and safe home for Fredo6’s tools. The RoundCorner plugin is actually free for personal use. 1. The Best Free Option: Fredo6 RoundCorner Extension

RoundCorner is very "greedy" on geometry. A simple cube with 6 segments can generate over 300 new faces. Use a low segment number for simpler models. 2. The Newer Alternative: FredoCorner

Here are some tips and tricks to help you use the Round Corner extension effectively:

Use the official free/donation version. It’s safe, updated, and supports Fredo6 (who provides exceptional tools like LibFredo6, Curviloft, etc.). If you cannot donate, the free version still works fully—just with a small nag screen.