Syncthing
Hacker ApprovedThe most recommended of 14 file sync apps
Free, open-source peer-to-peer sync that keeps files on your own devices without a cloud and runs reliably for years, though mobile support is awkward and devices must be online.
Free, open-source peer-to-peer sync that keeps files on your own devices without a cloud and runs reliably for years, though mobile support is awkward and devices must be online.
254 people gave an opinion
- recommend it
- 212
- criticize it
- 42
- approval share
- 83%
Recommended in 12 of 13 months
- November 2025: recommended
- December 2025: recommended
- January 2026: recommended
- February 2026: recommended
- March 2026: recommended
- April 2026: recommended
- May 2026: recommended
- June 2026: recommended
- July 2026: recommended
- August 2026: recommended
- September 2026: recommended
- October 2026: recommended
- November 2026: not recommended (month in progress)
Owned for 5 years
Median of the 6 owners who said how long they have had it.
Each square is one year.
Why it carries the badge
- 212 people recommend itNeeds 10 or more, met.
- 5 recommenders for every criticNeeds 2 to 1 or better, met.
- Recommended in 12 of 13 monthsNeeds 4 or more, met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Reliable background sync for years
“It's simple to setup and will work forever instead of paying for different providers that might shut down or increase their prices.”
Comment from 13 Apr 2026 in “An Introduction to Obsidian” “Syncthing works very well, its only constraint is that it does need the devices to be often on if you want consistent syncing.”
Comment from 3 Sep 2026 in “Creating backup storage sucks” “Over years with >10k files / 100 gb, I've only ever had conflicts when I actually made conflicting simultaneous changes.”
Comment from 3 Nov 2025 in “Why Nextcloud feels slow to use” - Comment from 24 May 2026 in “It's time to talk about my writerdeck”
- Comment from 12 Jan 2026 in “The struggle of resizing windows on macOS Tahoe”
- Comment from 25 Sep 2026 in “F-Droid 2.0”
- Comment from 18 Jun 2026 in “Migrating from GNU Stow to Chezmoi”
- Comment from 22 Mar 2026 in “Show HN: Joonote – A note-taking app on your lock screen and notification panel”
No cloud, data stays yours
“try using Syncthing on iOS to keep your files synced across devices without having them uploaded to servers you don't control”
Comment from 20 Nov 2025 in “Android and iPhone users can now share files, starting with the Pixel 10” “Syncthing? I'm taking 'offline' to mean 'not requiring the internet', which means you can have plenty of computers!”
Comment from 7 Apr 2026 in “Show HN: Stop paying for Dropbox/Google Drive, use your own S3 bucket instead” “Syncthing is the only app i need for syncing files to home computer. No clouds, just your phone and computer”
Comment from 27 Apr 2026 in “When Your Digital Life Vanishes” - Comment from 9 Mar 2026 in “My Homelab Setup”
- Comment from 19 May 2026 in “The Quiet Renovation at Bitwarden”
- Comment from 19 Feb 2026 in “Show HN: An encrypted, local, cross-platform journaling app”
Syncs phones and computers
“Syncthing is the way! Along with the Material Files app from F-droid, I finally get to have a file based workflow on Android.”
Comment from 5 Jan 2026 in “During Helene, I Just Wanted a Plain Text Website” “Syncthing is wonderful, and does a great job of syncing between an Android phone's photos/videos and a laptop.”
Comment from 13 Dec 2025 in “Apple has locked my Apple ID, and I have no recourse. A plea for help” “auto-syncs between my desktop, laptop, Android tablet, phone and a generic cloud backup folder with SyncThing”
Comment from 7 Nov 2025 in “Apple is crossing a Steve Jobs red line” - Comment from 27 Apr 2026 in “When Your Digital Life Vanishes”
- Comment from 7 Apr 2026 in “Show HN: Stop paying for Dropbox/Google Drive, use your own S3 bucket instead”
- Comment from 23 Mar 2026 in “GrapheneOS will remain usable by anyone without requiring personal information”
Easy backups to NAS
“Syncthing allows for time based backups folder so nothing can really be lost even in the case of ransomware attack.”
Comment from 5 Jun 2026 in “Fast Android File Manager that works” “I use syncthing to a NAS, and the syncthing data being backed up by the NAS along everything else it contains.”
Comment from 3 Sep 2026 in “Creating backup storage sucks” “You can literally set up SyncThing to stream your on-device backups to your NAS, cloud storage, or whatever.”
Comment from 28 Dec 2025 in “Gpg.fail” - Comment from 3 Nov 2025 in “Why Nextcloud feels slow to use”
What people warn about
Each mark is one comment
Mobile clients unofficial or discontinued
“Their official client stopped being developed and while there are options it isn't straightforward”
Comment from 27 Apr 2026 in “When Your Digital Life Vanishes” “much as I love syncthing, I wouldn't recommend it to nontechnical people”
Comment from 18 May 2026 in “The Quiet Renovation at Bitwarden” “You can use Syncthing for local E2EE sync, but it won't work on your mobile due to this. It works fantastic machine to machine.”
Comment from 15 Apr 2026 in “Fuck the Cloud (2009)” - Comment from 21 Feb 2026 in “Password managers less secure than promised”
- Comment from 7 Dec 2025 in “The Syncthing Android drama is exploding”
Devices must stay online
“It sometimes takes a while for them to discover each other, and it of course works better when all the devices are on my home network.”
Comment from 22 Feb 2026 in “Password managers less secure than promised” “Syncthing works very well, its only constraint is that it does need the devices to be often on if you want consistent syncing.”
Comment from 3 Sep 2026 in “Creating backup storage sucks” “there’s no good way to keep syncthing running all the time on iOS, which can lead to sync conflicts.”
Comment from 21 Feb 2026 in “Password managers less secure than promised” - Comment from 26 Nov 2025 in “Surprisingly, Emacs on Android is pretty good”
Fiddly setup and maintenance
“A service running in the background that exposes an "insecure" url for a browser to then open as the only means for GUI interaction with the app is not a great recommendation for everyday users.”
Comment from 7 Jan 2026 in “Everyone hates OneDrive, Microsofts cloud app that steals and deletes files” “Syncthing is definitely (much) more fiddly than using Bitwarden's and Obsidian's ($5/mo) native syncing tools.”
Comment from 6 Nov 2025 in “Two billion email addresses were exposed” “maintaining that turned out to be more effort than my tiny attention span can afford these days”
Comment from 7 Apr 2026 in “Show HN: Stop paying for Dropbox/Google Drive, use your own S3 bucket instead” - Comment from 2 Apr 2026 in “Foxing aspires to be an eBPF-powered replication engine for Linux filesystems”
- Comment from 14 Apr 2026 in “Backblaze has stopped backing up your data”
Sync conflict files pile up
“you're always thinking about if you're going to have to clean up a bunch of sync conflict files later”
Comment from 28 Feb 2026 in “Obsidian Sync now has a headless client” “there’s no good way to keep syncthing running all the time on iOS, which can lead to sync conflicts.”
Comment from 21 Feb 2026 in “Password managers less secure than promised” “Something with less config knobs, that 'just works' and handles conflicts more intelligently.”
Comment from 2 Apr 2026 in “Foxing aspires to be an eBPF-powered replication engine for Linux filesystems”
Other file sync apps people recommend
The four most recommended other file sync apps, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
| Product | Recommend | Criticize | Approval | Months | Owned | Badge |
|---|---|---|---|---|---|---|
| SyncthingThis page | 212 | 42 | 83% | 12 | 5 yrs6 owners | Approved |
| rsync | 157 | 85 | 65% | 12 | 24 yrs4 owners | — |
| Nextcloud | 154 | 126 | 55% | 12 | 3 yrs21 owners | — |
| rclone | 95 | 13 | 88% | 12 | 3 yrs3 owners | Approved |
| Unison file synchronizer | 24 | 3 | 89% | 11 | — | Approved |
What people said
40 of the 308 comments that mention it, newest first. Each links to the original comment.
“I use it and rely on it, and I haven't opened it in over a month. It works as a background service.”
“I use syncthing to a NAS, and the syncthing data being backed up by the NAS along everything else it contains.”
“Syncthing works very well, its only constraint is that it does need the devices to be often on if you want consistent syncing.”
“it happens automatically in almost real time as soon as the file is saved on one of my machines”
“Syncthing allows for time based backups folder so nothing can really be lost even in the case of ransomware attack.”
“So as long as my laptop and my desktop are both turned on I can trust they're always fully up-to-sync with each other”
“the syncing is entirely run on your machines; your data never ends up written to someone else's SSD.”
“the most popular third party android app is discontinued (I use the nerdily named syncthing-fork)”
“much as I love syncthing, I wouldn't recommend it to nontechnical people”
“Their official client stopped being developed and while there are options it isn't straightforward”
“Syncthing is the only app i need for syncing files to home computer. No clouds, just your phone and computer”
“You can use Syncthing for local E2EE sync, but it won't work on your mobile due to this. It works fantastic machine to machine.”
“It works perfectly fine if you're user that know how it works. I use it with Syncthing”
“It's simple to setup and will work forever instead of paying for different providers that might shut down or increase their prices.”
“maintaining that turned out to be more effort than my tiny attention span can afford these days”
“Free, opensource, works on computers and phones, can in most cases puncture nat, supports local discovery”
“Syncthing? I'm taking 'offline' to mean 'not requiring the internet', which means you can have plenty of computers!”
“Something with less config knobs, that 'just works' and handles conflicts more intelligently.”
“im using syncthing to sync freetube's settings/subscriptions between desktop and mobile”
“Syncthing keeps it all synced with my laptop. All working together seamlessly for years.”
“Syncthing keeps local copies of the files, so editing a photo inside a Synthing folder is like editing a normal file on your computer”
“provides an elegant way of providing some disk for a friend while maintaining privacy of the content”
“you're always thinking about if you're going to have to clean up a bunch of sync conflict files later”
“It sometimes takes a while for them to discover each other, and it of course works better when all the devices are on my home network.”
“there’s no good way to keep syncthing running all the time on iOS, which can lead to sync conflicts.”
“you might also consider something like Syncthing for sync without any cloud intermediary”
“Syncthing worked fast and basically flawlessly, better than either iCloud or Dropbox in my experience.”
“its so much simpler when you have the files stored locally, then syncing between devices is just something that can happen whenever”
“A service running in the background that exposes an "insecure" url for a browser to then open as the only means for GUI interaction with the app is not a great recommendation for everyday users.”
“Syncthing is the way! Along with the Material Files app from F-droid, I finally get to have a file based workflow on Android.”
“You can literally set up SyncThing to stream your on-device backups to your NAS, cloud storage, or whatever.”
“Syncthing is wonderful, and does a great job of syncing between an Android phone's photos/videos and a laptop.”
“Lost interest the momment I found out that all mobile clients for Syncthing are from third parties.”
“Things like Syncthing just aren't good enough if you don't also host a server that is always on.”
“try using Syncthing on iOS to keep your files synced across devices without having them uploaded to servers you don't control”
“auto-syncs between my desktop, laptop, Android tablet, phone and a generic cloud backup folder with SyncThing”
“Syncthing is definitely (much) more fiddly than using Bitwarden's and Obsidian's ($5/mo) native syncing tools.”
“I have it installed on my immediate family's devices to ensure all the photos are auto-backed-up to our NAS”
“It works well for smaller folders but it slows down to a crawl with folders that contain thousands of files.”
“Over years with >10k files / 100 gb, I've only ever had conflicts when I actually made conflicting simultaneous changes.”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.