# Best Open-Source Cloud Storage Services in 2026

Source: https://listme.name/best/cloud-storage-services/open-source

Cloud storage services differ in how much free space they give, whether they encrypt files end to end and whether you can run them yourself. This ranking weighs free storage and everyday sync first, then privacy, platform reach and paid plans.

## 1. Nextcloud (score 84.0)

The only open-source service here, under AGPL, and it runs on a server you control. It asks more of you than the hosted services, because updates, backups and security fall to you unless you pay a provider.

- Best for: Self-hosted file sync for teams and privacy-minded users
- Free and open source | Windows, macOS, Linux, Android, iOS, Web, Self-hosted | open source (AGPL-3.0)
- Website: https://nextcloud.com/
- Page: https://listme.name/software/nextcloud

## 2. Seafile (score 83.0)

Open-source file sync you can run on your own server, with clients for Windows, macOS, Linux, iOS and Android. The server core is AGPL-3.0, and the company offers SeafilePlus Cloud as a paid hosted option.

- Best for: Teams that want self-hosted file sync
- Free and open source | Windows, macOS, Linux, iOS, Android, Self-hosted | open source (AGPL-3.0)
- Website: https://www.seafile.com/en/home/
- Page: https://listme.name/software/seafile

## 3. Internxt (score 82.0)

End-to-end encrypted storage with post-quantum cryptography, 1 GB free, iOS and Android apps, and an AGPL-3.0 drive web client. Its free space is far smaller than Google Drive or MEGA, so it suits private files rather than large libraries.

- Best for: Private files that need end-to-end encryption
- Free plan, paid upgrades | Web, iOS, Android | open source (AGPL-3.0)
- Website: https://internxt.com/
- Page: https://listme.name/software/internxt

## 4. Filen (score 81.0)

Zero-knowledge encrypted storage with web, desktop, mobile and CLI apps, and open-source clients under AGPL-3.0. It mounts as a network drive on Windows, macOS and Linux, though its homepage does not state the free storage size.

- Best for: Developers and privacy users who want a network drive
- Free plan, paid upgrades | Web, Windows, macOS, Linux, Command line | open source (AGPL-3.0)
- Website: https://filen.io/
- Page: https://listme.name/software/filen