Quick Verdict
Syncthing if you only need device-to-device sync. Seafile if you need sharing links or a web file browser. Syncthing is simpler, lighter, and truly serverless — files sync directly between your devices. Seafile adds a central server with a web UI, sharing links, and multi-user support. Both excel at fast file sync; the choice depends on whether you need the server features.
Overview
Syncthing is a decentralized, peer-to-peer file sync tool. Devices connect directly to each other — no central server. It does one thing: keep folders in sync across devices. It does this exceptionally well, with block-level delta sync and strong encryption.
Seafile is a client-server file sync and share platform. It runs a central server that stores files, serves a web UI, and handles sharing. Desktop clients sync files to/from the server. Its custom block-level storage engine makes it the fastest server-based sync solution available.
Feature Comparison
| Feature | Seafile | Syncthing |
|---|---|---|
| Architecture | Client-server (central hub) | Peer-to-peer (decentralized) |
| Central server required | Yes (app + database) | No |
| Web file browser | Yes (clean, fast) | No (config UI only) |
| File sharing links | Yes (password, expiry) | No |
| Desktop sync client | Yes (Windows, macOS, Linux) | Yes (Windows, macOS, Linux) |
| Mobile app | Yes (iOS, Android) | Android only (no official iOS) |
| Sync speed | Very fast (block-level) | Very fast (block-level, P2P) |
| Delta sync | Yes | Yes |
| File versioning | Yes (efficient storage) | Yes (configurable) |
| Client-side encryption | Yes (per-library) | N/A (all traffic encrypted) |
| Multi-user support | Yes (permissions, quotas) | No (device-level) |
| Collaborative editing | Yes (SeaDoc, OnlyOffice) | No |
| External access (web) | Yes (any browser) | No (local devices only) |
| Server RAM usage | 256-512 MB | N/A (no server) |
| Client RAM usage | ~50-100 MB | 30-50 MB |
| Docker complexity | 3 services | 1 service |
| Single point of failure | Server | None (distributed) |
| Works offline | Client has local copy | Always (P2P) |
| License | AGPL-3.0 (Community) | MPL-2.0 |
Installation Complexity
Syncthing is the simplest file sync tool you can self-host. One Docker container, one port, one volume. Install it on each device, pair via Device IDs, share folders. Done. See our Syncthing Docker guide.
Seafile requires a server with its application, a MariaDB database, and Memcached. Three Docker services, multiple environment variables, domain configuration for external access. See our Seafile Docker guide.
Winner: Syncthing, decisively. No server to maintain at all.
Performance and Resource Usage
Both are fast. Seafile's block-level engine is designed for high-throughput server-to-client sync. Syncthing's P2P approach eliminates the server bottleneck entirely — LAN sync goes at full network speed.
| Metric | Seafile | Syncthing |
|---|---|---|
| LAN sync speed | 150-250 MB/s | 100-200+ MB/s |
| WAN sync speed | Server bandwidth limited | P2P (direct) |
| Small file handling | Excellent (batch blocks) | Excellent |
| Large file delta sync | Yes (blocks only) | Yes (blocks only) |
| Server resources | 256-512 MB RAM | N/A |
| Client resources | ~50-100 MB RAM | 30-50 MB RAM |
Performance is comparable. Seafile may edge ahead for many-client scenarios (one server, many clients). Syncthing may edge ahead for two-device sync on a LAN.
Community and Support
| Metric | Seafile | Syncthing |
|---|---|---|
| GitHub stars | 12,000+ | 68,000+ |
| License | AGPL-3.0 (Community) | MPL-2.0 |
| Commercial entity | Seafile Ltd. | None (community) |
| Documentation | Good | Good |
| Active development | Active | Active |
| Enterprise edition | Yes (paid, extra features) | No |
Use Cases
Choose Seafile If...
- You need to share files with others via links
- You want a web file browser accessible from any device
- You need multi-user support with permissions
- You want client-side encrypted libraries for sensitive data
- You want a central server that serves as the "source of truth"
- You need collaborative document editing
- You need iOS mobile app support
Choose Syncthing If...
- You only sync between your own devices
- You don't need sharing links or a web file browser
- You want zero server maintenance
- You want no single point of failure
- You value simplicity above all else
- Maximum privacy matters — no data touches any server
- You're on constrained hardware (Raspberry Pi, old laptop)
Final Verdict
Different tools for different needs. If you just want files synced between your own devices — no sharing, no web access, no multi-user — Syncthing is perfect and dramatically simpler.
If you need to share files with others, access files from a browser, manage multiple users, or want a central place for all your files — Seafile delivers that with excellent performance.
Many self-hosters use both: Syncthing for fast device-to-device sync of working files, and Seafile for shared family storage with web access.
FAQ
Can Syncthing work as a "server"?
Sort of. You can run Syncthing on an always-on machine that syncs with all your devices, effectively acting as a central hub. But it's still P2P — there's no web UI for browsing, no sharing links, no user management.
Is Seafile faster than Syncthing?
They're comparable. Seafile's server architecture can be faster for one-to-many sync (one server, many clients). Syncthing is faster for two-device LAN sync since traffic goes direct without a server hop.
Does Syncthing have an iOS app?
No official iOS app exists. Third-party apps like Möbius Sync are available but paid and less reliable. If iOS support is critical, Seafile or Nextcloud are better choices.
Can I encrypt files with Syncthing?
Syncthing encrypts all data in transit. For at-rest encryption on untrusted devices, Syncthing supports "Untrusted (Encrypted)" folder types — the remote device stores encrypted data it cannot read.
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