Vesper's custom sync service is being disabled, and the app will be removed from the App Store:
Sync will be turned off Aug. 30 at 8pm Pacific. We'll destroy all the data, and neither we nor anyone else will be able to recover it.
Apps die all the time - it's a part of life. Vesper was a well-made app, even if it never clicked with me, and it's a shame to see it go.
The interesting part is the sync service. You see, Vesper's developers decided that Vesper was simply too good to use something like iCloud sync or Dropbox sync. Instead, they created a custom sync service from scratch. I'm sure it was fabulous.
Now that it's going away, I hope you can see why that's a really bad thing.
Had Vesper used iCloud or Dropbox, users of the app would continue using it until some future iOS update finally broke compatibility.
At least the devs were nice enough to update the app one last time to add an export feature. That's a nice touch.