Contacts Journal CRM
can easily log phone calls and emails
can pull up notes on an individual before making the call
iOS and MacOS versions
Not “overkill” for one-man-band
rapid log with automatic and easy timestamps
Things that I find useful that you may not need
Can attach files to a contact’s individual logs and also to the contact generally
Can make ToDos for a contact within the app
Can access a map of contact locations within the app
Imports from Apple contacts and keeps some data in sync between them (not logs, not attached files, etc.)
Non-subscription (but it appears there is a subscription option for teams, not what I do)
Dark mode
There’s also a trial version available
images taken from ContactsJournal Twitter
https://mobile.twitter.com/contactsjournal