Just updated to macOS 11 "Big Sur" or macOS 12 "Monterey"? You may have noticed some of the apps in your Dock look a bit inconsistent with the rest of the system.
Replacicon makes it easy to find and replace app icons on the Mac. It scans online sources containing thousands of replacement app icons for each of your installed macOS apps and shows them all to you in one place. In just a click, you can change your third-party app icons so they better match the rest of the system, or your own tastes.
★★★★★
This is a godsend! Thank you!
- k4tagaki 
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To help you quickly find legacy icons to replace your Mac, Replacicon relies on machine-learned models to tell which icons are most in need of an update.
Replacicon even watches for app updates in the background so your customized icons are not lost across app updates.
Explore thousands of alternative icons for hundreds of Mac apps from sources like macosicons.com.
Search all installed apps to quickly find the one you want to fix up. Use filters to focus on apps in your Dock and legacy app icons.
Keep your alternate icons across app updates entirely automatically.
Import your own custom icons from disk and manage them along with all the rest.
Restore original icons if you change your mind.
Replacicon is a native app built just for macOS, and it works great with Intel and Apple Silicon Macs.
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Fantastic little app, great work!
Thank you. I've been waiting too long for something like this.
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