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Open source Google Contacts alternatives: 2 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rank

2 of the 7 Google Contacts alternatives we track are open source. Proton Mail and Nextcloud rank highest, with facts last verified Nov 8, 2026.

Quick comparison

#AppPricingVerified priceOpen sourcePlatformsVerified factsScore
1Proton Mail logoProton MailFree plan + paid$4.99 a month (Mail Plus), $3.99 billed yearlyYesWeb, Windows, macOS +38 of 865.0
2Nextcloud logoNextcloudOpen sourceFrom €71.29 per user/year (100 users)YesWeb, Windows, macOS +44 of 456.5
  1. Proton Mail logo

    1. Proton MailTop pick

    Best for: Privacy-minded people and teams who want encrypted email without running servers

    Free plan + paidOpen sourceWeb, Windows, macOS, Linux, iOS, Android

    65.0

    score / 100

    Why switch from Google Contacts

    Proton's encrypted contacts come with Proton Mail, for people leaving Google over privacy.

    Pros

    • End-to-end and zero-access encryption by default
    • Open-source, audited apps on every major platform
    • Bundles with Proton VPN, Drive, Calendar and Pass

    Cons

    • Free plan has little storage and one address
    • Search and third-party integrations are more limited than Gmail
    • Using desktop clients needs the paid Bridge app
    Visit Proton Mail Details and reviews
    How this score is calculated
    Editorial fit ×0.338
    Reviews ×0.363
    Clicks (90 days) ×0.15100
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Proton Mail a good Google Contacts alternative?

    Verified facts

    8 of 8 verified
    Free plan
    Yes, 1 GB storage
    Checked Nov 8, 2026proton.me(opens source in a new tab)
    Mail Plus price
    $4.99/month, or $3.99/month billed yearly
    Checked Nov 8, 2026proton.me(opens source in a new tab)
    Jurisdiction
    Switzerland
    Checked Nov 8, 2026proton.me(opens source in a new tab)
    Open source
    Yes, independently audited
    Checked Nov 8, 2026proton.me(opens source in a new tab)
    License (web clients)
    GPL-3.0
    Checked Nov 8, 2026github.com(opens source in a new tab)
    Starting price
    $4.99 a month (Mail Plus), $3.99 billed yearly
    Checked Nov 8, 2026proton.me(opens source in a new tab)
    Proton Unlimited plan
    $12.99 a month, $9.99 billed yearly
    Checked Nov 8, 2026proton.me(opens source in a new tab)
    Money-back guarantee
    30 days
    Checked Nov 8, 2026proton.me(opens source in a new tab)
  2. Nextcloud logo

    2. Nextcloud

    Best for: Organisations and tinkerers who want Google Drive features on their own server

    Open sourceSelf-hostableWeb, Windows, macOS, Linux, iOS, Android, Self-hosted

    56.5

    score / 100

    Why switch from Google Contacts

    Self-hosted Contacts app with CardDAV sync, so your address book stays on your own server.

    Pros

    • Free, open source and fully self-hostable
    • Large app ecosystem beyond files
    • Data stays wherever you choose to run it

    Cons

    • You handle updates, backups and performance
    • Can feel slow on modest hardware
    • Quality varies across community apps
    Visit Nextcloud Details and reviews
    How this score is calculated
    Editorial fit ×0.334
    Reviews ×0.363
    Clicks (90 days) ×0.1550
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Nextcloud a good Google Contacts alternative?

    Verified facts

    4 of 4 verified
    Open source
    Yes
    Checked Nov 8, 2026nextcloud.com(opens source in a new tab)
    Self-hosting
    Yes
    Checked Nov 8, 2026nextcloud.com(opens source in a new tab)
    Enterprise price
    From €71.29 per user/year (100 users)
    Checked Nov 8, 2026nextcloud.com(opens source in a new tab)
    Client apps
    Free
    Checked Nov 8, 2026nextcloud.com(opens source in a new tab)