CardBook is a Thunderbird address book based on the CardDAV and vCard standards. It can also run independently of Thunderbird.
CardBook provides an integrated contact management solution with a fully functional and logical UX and UI.
This is free and open source software.
Key Features
- Autocompletion in mail address fields and Lightning calendar fields.
- Manage contacts from messages.
- Restrict address book use by mail account (for email autocompletion, email collection and contact registration).
- Easy CardDAV synchronization.
- Access to all vCard data.
- Supports vCard 3.0 and vCard 4.0 (default).
- Customizable data fields.
- Unlimited number of custom fields.
- Show address on map.
- Unlimited categories, email addresses, phone numbers, addresses, chat programs, URLs, calendar events per contact.
- Supports colored categories.
- Hierarchized organization support.
- Phone number validation.
- Call phone numbers using softphone, like TBDialOut.
- Connect directly to softphone (Jami, Linphone) to make phone calls using SIP.
- Address panel.
- Connect directly to chat programs (Google, Jabber, Jami, Skype, QQ) to chat using IMPP.
- Local cache AES-CTR encryption support (disabled by default).
- Digest access authentication.
- Drag and drop support.
- Saved search.
- Filter.
- Merge contacts modified both locally and on the server.
- Find and merge duplicate contacts.
- Find all emails related to a contact.
- Find all calendar entries related to a contact.
- Find ignoring diacritical marks.
- Share contacts by email.
- Collect outgoing emails.
- Contacts stored in IndexedDB.
- Customizable printouts.
- Import Thunderbird standard address books.
- CSV file export and import.
- VCF file export and import.
- Functional GUI.
- Classic and vertical layout.
- Anniversary manager.
- Export birthdays to Lightning add-on.
- Task manager.
- Standalone or fully integrated within Thunderbird.
- Compatible and complementary with add-ons in the ATN ecosystem.
- Additional and optional software configuration support.
- Automatic configuration.
- Available in many languages.
- Fully integrated in the main Thunderbird window (yellow stars, possibility to edit|remove|add standard and CardBook contacts).
- Import Microsoft Outlook Contacts.
- Cross-platform support – runs under Linux, BSD, macOS, and Windows.
Website: gitlab.com/CardBook/CardBook
Support: GitLab Code Repository
Developer: Philippe Vigneau and contributors
License: Mozilla Public License Version 2.0

CardBook is written in JavaScript. Learn JavaScript with our recommended free books and free tutorials.
Related Software
| Address Book Managers | |
|---|---|
| KAddressBook | Supports a wide range of services including NextCloud, Google Contacts |
| Contacts | GNOME's integrated address book. It is written in Vala and uses libfolks |
| qcard | CLI addressbook application for CardDAV servers |
| khard | Console vcard client |
| CardBook | Thunderbird address book based on CardDAV and vCard standards |
| aercbook | Minimalist address book for the aerc e-mail client |
Read our verdict in the software roundup.
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