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Koofr alternatives · File Storage

Open-source alternatives to Koofr

Koofr is not described as open source on its own site. 8 of the 45 other file storage and sync services in this directory are open source, according to their own sites.

Koofr has a free plan. Paid plans start at €0.50 per month for 10 GB extra, billed yearly, incl. 22% VAT. All of them are free or have a free plan.

8 tools · Listings checked up to Nov 12, 2026 · Where the facts come from

How each one differs from Koofr

  1. Filen

    End-to-end encrypted cloud storage from Germany with open source apps

    • Filen starts at €11.99 per year for 100 GiB, or €1.99 per month for 200 GiB. Koofr starts at €0.50 per month for 10 GB extra, billed yearly, incl. 22% VAT.
    • Only Koofr lists a browser extension.
    • Filen is open source and end-to-end encrypted, according to its own site.
    • Filen also covers notes.
    Filen vs KoofrFilen pricing and details

  2. Proton Drive

    End-to-end encrypted cloud storage from the maker of Proton Mail

    • Proton Drive starts at $3.99 per month, billed yearly. Koofr starts at €0.50 per month for 10 GB extra, billed yearly, incl. 22% VAT.
    • Only Koofr lists a Linux app.
    • Only Koofr lists a browser extension.
    • Proton Drive is open source and end-to-end encrypted, according to its own site.
    Proton Drive vs KoofrProton Drive pricing and details

  3. Internxt

    Open source, zero-knowledge cloud storage with lifetime plans

    • Internxt starts at $11.99 per month, billed annually (list price). Koofr starts at €0.50 per month for 10 GB extra, billed yearly, incl. 22% VAT.
    • Only Koofr lists a browser extension.
    • Internxt is open source and end-to-end encrypted, according to its own site.
    • Internxt can be bought with a one-time purchase.
    Internxt vs KoofrInternxt pricing and details

  4. Nextcloud

    Open source, self-hosted file sync and collaboration platform

    • Nextcloud starts at 71.29€ per user / year, excl. VAT (from 100 users). Koofr starts at €0.50 per month for 10 GB extra, billed yearly, incl. 22% VAT.
    • Only Koofr lists a browser extension.
    • Nextcloud is open source and self-hostable, according to its own site.
    • Nextcloud also covers video calls.
    Nextcloud pricing and details

  5. ownCloud

    Open-source file sync and share you can host yourself

    • Only Koofr lists a Linux app.
    • Only Koofr lists a browser extension.
    • ownCloud is open source and self-hostable, according to its own site.
    ownCloud pricing and details

  6. Seafile

    Open-source file sync and share, self-hosted or in the cloud

    • Seafile starts at $8 per user / month (Plus Cloud Team plan). Koofr starts at €0.50 per month for 10 GB extra, billed yearly, incl. 22% VAT.
    • Only Koofr lists a browser extension.
    • Seafile is open source and self-hostable, according to its own site.
    Seafile pricing and details

  7. Syncthing

    Free, open source file sync directly between your own devices

    • Syncthing is free. Koofr starts at €0.50 per month for 10 GB extra, billed yearly, incl. 22% VAT.
    • Only Koofr lists a web app.
    • Only Koofr lists iOS and Android apps.
    • Only Koofr lists a browser extension.
    Syncthing pricing and details

  8. Cryptomator

    Open-source encryption for the files you keep in any cloud

    • Cryptomator starts at $12.00 per seat / month, billed yearly (Cryptomator Hub Standard). Koofr starts at €0.50 per month for 10 GB extra, billed yearly, incl. 22% VAT.
    • Only Koofr lists a web app.
    • Only Koofr lists a browser extension.
    • Cryptomator is open source and self-hostable, according to its own site.
    Cryptomator pricing and details

Common questions

Is there an open-source alternative to Koofr?

Yes. Filen, Proton Drive, Internxt, Nextcloud, ownCloud, Seafile, Syncthing and Cryptomator are open source, according to their own sites.

Is Koofr open source?

Koofr is not described as open source on its own site. The listing was checked on Oct 5, 2026 against the pages it cites.

When was this checked?

Each listing shows its own date. On this page they run from Oct 5, 2026 to Nov 12, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Koofr: the alternatives its listing names first, then the tools that share the most features with it.