#1★ TOP PICK
Nextcloud
A full self-hosted cloud: files, sharing, and more.
90
OPEN SOURCEAGPL-3.0SELF-HOST
Nextcloud is the most complete open-source Dropbox replacement — file sync and sharing plus calendars, contacts, and an app ecosystem — all on a server you control. It is the best all-round fit when you want Dropbox-style features without the cloud.
Strengths
- +Closest all-round Dropbox replacement
- +Sync, sharing, and an app ecosystem
- +You own 100% of the data
Trade-offs
- −You run and back up the server
- −Fuller stack than a pure sync tool
Free / open-source (self-host); paid support/hosting optional #2
Syncthing
Continuous peer-to-peer file sync with no cloud.
92
OPEN SOURCEMPL-2.0SELF-HOSTLOCAL-FIRST
Syncthing keeps folders in sync directly between your own devices, peer-to-peer and encrypted, with no server and no cloud in the middle. It is the purest self-owned option — brilliant for device-to-device sync, though it is sync only, not a sharing suite.
Strengths
- +No server or cloud at all
- +Peer-to-peer and encrypted
- +Very light and reliable
Trade-offs
- −Sync only — no web sharing/links
- −Devices must be online to sync
#3
Seafile
Fast, reliable self-hosted file sync and share.
86
OPEN SOURCEAGPL-3.0SELF-HOST
Seafile is an open-source file-sync-and-share platform known for fast, reliable syncing and client-side encryption options. Its Community Edition is self-hostable and a strong choice when raw sync performance matters.
Strengths
- +Fast, reliable sync engine
- +Client-side encryption option
- +Mature clients
Trade-offs
- −Some features are Pro-only
- −Smaller app ecosystem than Nextcloud
Free self-host (Community Edition); paid Pro tier