HistoryHound 1.9.12 and Jettison 1.5.2 both deliver stability improvements and bug fixes to make sure they run without issue on El Capitan and Sierra.
HistoryHound also includes better error handling and its indexing is more intelligent when it encounters web pages that redirect you to a new page. You can now click on status messages in the main window to show you the status of indexing and the contents of your search index, and HistoryHound 1.9.12 supports the Vivaldi browser as well as Safari, Chrome, Firefox, OmniWeb, iCab, Opera, NetNewsWire and URL Manager Pro.
Full lists of changes and download links are available on the HistoryHound release page and the Jettison release page.