7 Open Source Cloud Storage Apps for Privacy-Focused Users

Most people default to Google Drive or Dropbox without thinking about where their files actually live. If you're reading this, you've probably already asked yourself whether a tech giant should have access to your documents, photos, and backups.

The good news is that open source cloud storage has matured significantly. You no longer need to choose between convenience and privacy — the tools below give you both. Whether you want a full Google Workspace replacement or a lightweight sync layer between your own machines, there's an option here for you.

Nextcloud

Nextcloud is the most complete self-hosted cloud platform available today. What started as a Dropbox alternative has grown into a full productivity suite with file sync, calendar, contacts, email, video chat, and in-browser document editing.

If your goal is to replace Google Drive and the broader Google Workspace experience, Nextcloud is where you start. It offers desktop and mobile sync clients, granular sharing permissions, file versioning, and hundreds of apps through its built-in App Store.

• License: AGPL-3.0
• Self-hostable: Yes
• Best for: Teams and individuals who want the fullest feature set

Learn more about Nextcloud on OpenAltFinder.

Seafile

Seafile takes a different approach from Nextcloud. Instead of trying to be everything, it focuses on doing one thing extremely well: file sync and sharing. It uses a library-based model with client-side encryption and is known for exceptional performance and reliability at scale.

If you manage a large number of files or users, Seafile's speed and selective sync are hard to beat. It also supports shared links with expiry dates, password protection, and integration with ONLYOFFICE for document editing.

• License: AGPL-3.0
• Self-hostable: Yes
• Best for: Organizations that prioritize performance and data security

Learn more about Seafile on OpenAltFinder.

ownCloud

ownCloud is the original open-source file sync platform and the direct predecessor to Nextcloud. It remains a solid, enterprise-grade option with strong compliance features, SSO integration, audit logging, and encryption at rest.

The team behind ownCloud is also building a modern cloud-native rewrite called Infinite Scale (oCIS), which is designed for the scalability demands of large organizations. If you need professional support and a long track record in regulated industries, ownCloud is worth serious consideration.

• License: AGPL-3.0
• Self-hostable: Yes
• Best for: Enterprises and public-sector organizations with strict compliance needs

Learn more about ownCloud on OpenAltFinder.

Syncthing

Syncthing is unlike anything else on this list. There is no central server. Instead, it synchronizes files directly between your devices using peer-to-peer connections. Your data never passes through a cloud provider — it moves directly from your laptop to your phone, your server to your desktop.

This means no subscription fees, no storage limits beyond your own hardware, and no company with access to your files. It handles conflict resolution, selective sync, and encrypted transfers out of the box.

• License: MPL-2.0
• Self-hostable: Yes (it's all your own devices)
• Best for: Privacy purists who don't want any cloud at all

Learn more about Syncthing on OpenAltFinder.

OpenCloud

OpenCloud is a newer, lightweight open-source file management platform built with simplicity in mind. It offers file storage, sharing, and collaboration without the heavyweight setup that comes with some of the larger platforms.

Licensed under Apache-2.0, OpenCloud targets teams who want the convenience of services like Google Drive or SharePoint but without the vendor lock-in. Its modern architecture makes deployment straightforward compared to some legacy alternatives.

• License: Apache-2.0
• Self-hostable: Yes
• Best for: Teams who want a clean, modern alternative without heavy infrastructure

Learn more about OpenCloud on OpenAltFinder.

Twake Drive

Twake Drive is an open-source, encrypted data storage platform designed for team collaboration. It supports shared drives with fine-grained access rights, built-in document editing through integrations like ONLYOFFICE, and full-text search across your files.

A key differentiator is its strong focus on encryption — both files and metadata are protected with unique keys. You can self-host for full data sovereignty or use their managed option.

• License: AGPL-3.0
• Self-hostable: Yes
• Best for: Teams that need encrypted collaboration with hosting control

Learn more about Twake Drive on OpenAltFinder.

Paperless-ngx

Paperless-ngx is not a general-purpose cloud storage platform, but if your primary use case is managing documents, it's the best tool for the job. It turns scanned paper documents into a fully searchable archive using OCR.

Documents are automatically tagged and classified using machine learning, and you can add files via the web interface, email, or a watched folder. For home offices and small teams drowning in paperwork, it replaces the document management side of Google Drive with something far more purpose-built.

• License: GPL-3.0
• Self-hostable: Yes
• Best for: Home offices and anyone with a document scanner

Learn more about Paperless-ngx on OpenAltFinder.

Which one should you choose?

If you want the fullest replacement for Google Workspace, start with Nextcloud. If raw file-sync performance is your top priority, go with Seafile. For maximum privacy with zero cloud footprint, Syncthing is unbeatable. And if your problem is specifically paper documents, Paperless-ngx will change how you work.

The best part is that all of these run on your own hardware. Your files stay yours.