This reminds me of past attempts at solving this problem like Greplin and Found.app that never took off for various reasons. I like that Pensieve is local-first and seems to be privacy-focused by being a local app. I hope you can find a sustainable business model and not need to store anything (even memories) on your servers.

Please add GitHub, Trello, etc. integrations that developers and tech types commonly use.

You know what would be cool? !service bang search options like Duck Duck Go has for jumping to specific search results.

A few issues I found:

* I created my first memory and I couldn't find it again. I then created a second one and only then did they both show up in the search results.

* You should warn the user if there is another app using the Option-Space shortcut

* Command-W doesn't work with the Settings window open

The app icon reminds me of the old Motif color scheme from back in the day.

Nice work!