Syncthing vs Resilio Sync vs Nextcloud: Best Tool for Private File Sync
Dropbox and Google Drive solve file sync by putting a copy of everything on someone else’s server. Syncthing, Resilio Sync, and Nextcloud are the three tools that come up most for readers who want their files synced across devices — laptop, phone, NAS — without a third party holding a copy, but they take three different approaches to get there.
Search intent
Someone searching “Syncthing vs Resilio Sync vs Nextcloud” has decided against Dropbox/Google Drive for privacy or cost reasons and wants continuous file sync between their own devices, and is trying to figure out which tool actually fits — a lightweight sync-only tool, or a fuller self-hosted platform.
Quick take
- Want pure device-to-device sync, fully free, no server to run: Syncthing
- Want the same peer-to-peer idea with a more polished consumer app: Resilio Sync (Home tier, free)
- Want sync plus a full file-hosting platform — sharing links, mobile backup, calendar/contacts: Nextcloud (self-hosted, free)
The three options
Syncthing is free, open source (MPL-2.0), and fundamentally different from the other two: there’s no central server at all, ever. Every device syncs directly with every other device it’s paired to, over TLS with perfect forward secrecy, using cryptographic certificates so only devices you’ve explicitly authorized can connect. Nothing passes through a third party — not even Syncthing’s own infrastructure. The trade-off is that it’s sync-only: no web UI for browsing files remotely, no public share links, no mobile-photo-backup app with the polish of a commercial tool. It’s the right tool when the job is strictly “keep folder X identical across these 3 machines.”
Resilio Sync is built on the same peer-to-peer, no-central-server model as Syncthing (it descends from BitTorrent’s sync technology) but ships as a more consumer-friendly app with a cleaner setup flow, selective sync, and a easier mobile experience. As of its current pricing structure, the free Home tier now includes the features that used to be gated behind a separate paid “Pro” tier, so most individual/homelab use cases are covered at no cost. A separate Business tier exists for organizations needing centralized management and audit features, but Resilio doesn’t publish Business pricing — it’s sales-led, quote-only, so treat any specific price you see elsewhere as unverified and confirm directly with Resilio before budgeting for it.
Nextcloud is a different category entirely: a full self-hosted file-and-collaboration platform, not just a sync tool. The self-hosted Community edition is completely free and open source, with no user limit, and it does far more than sync — web-based file browsing, public/expiring share links, calendar and contacts sync, and a large app ecosystem (as covered in Nextcloud vs Google Workspace). For readers who don’t want to run their own server, Nextcloud GmbH sells managed hosting (Nextcloud One, fully managed and hosted in Germany) and paid support subscriptions for self-hosted deployments, running roughly $6.25–$18.42 per user/month across Standard/Premium/Ultimate support tiers — relevant mainly to businesses that want a support contract, not solo/homelab users running it free on their own hardware.
Which one should you actually pick?
- Just want folders identical across a laptop, desktop, and NAS, nothing else: Syncthing — free, no server, no account.
- Want the peer-to-peer approach but a more polished mobile app and easier setup for non-technical users: Resilio Sync Home — also free at the individual tier.
- Want to also browse files from a browser, share a link with someone outside your network, or sync contacts/calendars: Nextcloud — free self-hosted, but it’s a heavier install than either sync-only tool; pairs well with a NAS or mini PC as the host.
- This is about backup, not live sync between devices you use daily: see the 3-2-1 backup strategy and automated offsite backups with Restic/Borg instead — sync and backup solve different problems and neither Syncthing nor Resilio Sync is a backup tool on its own (no version history by default in the way a real backup tool provides).
NAS / homelab hardware placeholder — swap for a real hardware affiliate link once a program is confirmed, for readers who need a device to host Nextcloud or act as a permanent Syncthing/Resilio node.
Bottom line
Syncthing and Resilio Sync both do device-to-device sync for free with no central server; Syncthing is the fully open-source, no-account option, Resilio Sync trades a bit of that purity for a more polished app. Nextcloud is the right call once the need grows past “sync my folders” into browsing, sharing, and hosting files for other people — at the cost of running a heavier self-hosted platform.