[hack1312]

If you’re looking specifically for an Aperture replacement, Nitro[0] was created by the person who led the Aperture, iPhoto, RAW Camera and Core Image engineering teams, as well as the imaging team for the Mac version of Photos.

No subscription cost either.

[0] https://www.gentlemencoders.com/nitro-for-macos/

[CharlesW]

Nitro is wonderul. On macOS it also integrates perfectly with Photos, which I find to be an ideal "combination pro/consumer surface" for my library.