If you loved Splinter, try The Grudge 3
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Toby Wilkins, and they sit in Horror / Thriller territory. If that's the register that drew you to Splinter, the second film will land in a comparable space — through a different lens.
What The Grudge 3 is
Chicago, winter. A slamming cell door. The lone survivor of a terrible haunting dies in lockup. His doctor and a mysterious woman trace the curse back to a haunted apartment building. A later-period entry in a worn-out series.

