The best alternatives to Snippy are Snipper App, Marmoset, and Danger Cove. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Snippy?
Hurreeβ The smarter, simpler way to analyze your data
Snipper is a native macOS snippets manager with modern, lightweight GUI, syntax highlighting, and Markdown support. Stay more organized and productive during your day to day job.
Carbonize brings Dawn Lab's Carbon to the Mac desktop and adds some native features that make it even more of a pleasure to use. - You can drag code onto Carbonize's Dock icon. - Use the Services menu that's available in many editors to send code to Carbonize. - Drag exports from the preview window into as many apps or sites as you like.