Very nice! I immensely appreciate the "no network connections whatsoever" approach, and search quality looks useful so far.
I have a problem however: the app only sees a fraction of my images. I do not use iCloud, but backup and sync locally with macOS.
Photos.app/sync is configured to copy & delete photos from iOS to Mac, then sync them back through a "all photos of the last two years" smart album.
Those photos appear in iOS Photos, but seem to be invisible to Queryable - it only sees those photos taken after my last backup & sync. Directly after backup and sync, it sees no photos at all.
I think I've seen that once before in another app, so that is probably a bug in iOS/macOS and nothing you can fix, but I thought I'd let you know anyway.