KAddressBook
KAddressBook: A free Linux contact manager with KDE integrations and address-book syncing. Ranked #30 of 39 in Contact Management Software by our editors (5.8/10); pricing: Free plan; best for linux users in the KDE contact ecosystem.
At a glance
- Editor score5.8 / 10
- PricingFree plan
- Best forLinux users in the KDE contact ecosystem
- Free planYes
- Paid fromFree
- Facts checked24 Sep 2026
Where it wins
- Find contacts with search and configurable filters.
- Detect and merge duplicate contacts across sources.
- Supports Nextcloud, CalDAV, LDAP, and other contact services.
Where it doesn't
- Linux desktop availability limits platform reach.
- Its focus is personal contacts rather than broader contact management.
- Support is community-based.
Our verdict on KAddressBook
KAddressBook is a desktop contact manager for keeping personal details about family, friends, and other contacts. It is a fit for Linux users who want an address book within KDE’s Kontact ecosystem, rather than a cross-platform contact-management service. The software is open source and has a free plan, making it suited to solo users seeking a local desktop tool connected to compatible contact services.
Its core workflow covers searching and configurable filters, duplicate detection and merging across multiple sources, and import and export of address-book standards. KAddressBook can connect to multiple LDAP servers to provide contact autocompletion in KMail. It also displays a QR code for each contact and can pass birthday reminders to KOrganizer. These features make it more useful as part of a KDE desktop setup than as a standalone directory for teams.
Connections include Nextcloud, Kolab, Google Contacts, Microsoft Exchange (EWS), and standard CalDAV servers. That breadth can help Linux users consolidate contacts from supported services, while the platform fit remains narrow: the listed availability is Linux desktop, and support is community-based. Choose KAddressBook if you want a free, open-source address book with KDE integration and contact syncing. Consider an alternative if you need broader platform coverage or a contact-management service beyond a personal desktop address book.
Your product? Our editors can test KAddressBook in depth and publish a review, labelled as paid · from $149/mo →
KAddressBook pricing
All 1 KAddressBook plans and prices →
KAddressBook fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Contact limit | Not verified |
| Company contacts | Not verified |
| Email sync | Not verified |
| Mobile apps | Not verified |
| Import sources | Address-book standards; specific import formats are not stated |
| Reminders | Yes |
| Deployment | Desktop |
| Platforms | Linux |
| Support | Community |
| Built for | Solo (editorial estimate) |
| Integrations | 9 integrations: Nextcloud, Kolab, Google Contacts, Microsoft Exchange (EWS), CalDAV, LDAP … |
| Pricing | Free plan (source) |
| Website | apps.kde.org |
| Facts checked | 24 Sep 2026 |
KAddressBook integrations
KAddressBook lists 9 integrations on its own site.
- Nextcloud
- Kolab
- Google Contacts
- Microsoft Exchange (EWS)
- CalDAV
- LDAP
- KMail
- KOrganizer
- Kontact
Alternatives to KAddressBook
- Google ContactsA strong free choice for contact management centered on Google services.9.1
- ContactsPlusA flexible contact hub with strong synchronization, enrichment, and team features.8.8
- ClozeA full contact-and-follow-up CRM with unlimited contacts, email sync, and team tools.8.6
See all KAddressBook alternatives →
Used KAddressBook? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used KAddressBook for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
KAddressBook is listed in our Contact Management Software directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/kaddressbook/"><img src="https://www.itechguides.com/best/badge/kaddressbook.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update