Compare software

BusyContacts vs Kontact: catalog facts
BusyContacts	Kontact
Paid Costs $49.99 USD with a 14-day free trial; also available through Setapp.	Free Free and open source, developed by the KDE community.
macOS	Linux
Direct sync with iCloud, Google, Exchange and CardDAV Tags, smart filters and per-contact activity history	Mail, calendar, contacts and feeds in one window Works offline with your data
macOS only One-time paid purchase after the trial	Best suited to the KDE Plasma desktop Large suite with many settings to learn
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.