When comparing Syncthing vs SpiderOak, the Slant community recommends Syncthing for most people. In the question“What are the best personal file-syncing solutions?” Syncthing is ranked 1st while SpiderOak is ranked 8th. The most important reason people chose Syncthing is:
Licensed under [MIT](https://github.com/calmh/syncthing/blob/master/LICENSE).
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free and open-source
Licensed under MIT.
Pro Cross-platform
Available for Linux, OS X and Windows and web.
Pro Works out of the box
Requires no configuration to protect your privacy; it just works.
Pro Reasonably active community forum
Pro Unofficial Android client available
An Android app was created by a third-party.
Pro Combines cloud syncing, storage service and backup client
Thus you have a single service for all of the things.
Pro Available for many platforms
The Spideroak client is available for Linux, MacOS, Windows, Android and iOS.
Pro Incrementals
SpiderOak updates only that part of the file that has changed, saving bandwidth and time.
Pro Zero knowledge
Data is locally encrypted before uploading to Spideroak. They cannot recover your data even if they wanted to since it is stored in encrypted state on their servers.
Pro Unintrusive
Cons
Con In beta
Although mostly stable, such stability is not guaranteed, and support is only community driven. Caution advised.