AVClub: Synchronicity is more contraption than movie, its plot as mechanically functional as a clock, rotating characters around like gears. Low-rent but high concept, the film tackles that most joyously convoluted of science-fiction scenarios—time travel, of course—with lots of enthusiasm but not much originality. Writer-director Jacob Gentry, who made the middle third of the underrated exquisite-corpse horror film The Signal, appears to have boned up on his Heinlein and Bradbury and Carruth, the last of whose Primer remains a blueprint for any hungry young filmmaker looking to blow minds on a budget. But the ideas here, many of them just twists in disguise, are largely recycled. If you’ve seen one movie where multiple versions of the same person occupy the same timeline… well, you haven’t necessarily seen them all, but you have seen this one.
FGE - Jacob Gentry’s Synchronicity falls disappointingly short of a complete experience. Technically sound visuals and intelligent imagery don’t do enough to salvage what could have been a classic film, bogged down by forgettable characters, lacklustre dialogue, and a wholly underwhelming storyline.
From Cinelinx:
Synchronicity seeks to put a love story twist on a hard science fiction story, involving time-travel, parallel dimensions, and one heck of a problem to deal with. It's a fun story with enough twists and turns to keep you guessing up to the end. Come inside to check out my full review!
Variety: Fantasy fans who prize tricksome plotting above spectacle may take a shine to “Synchronicity,” a time-travel tale much more in line with of such modestly scaled recent indies as “Predestination,” “Time Lapse” and the Spanish “Timecrimes” than action-oriented studio pics like “Looper” or “Edge of Tomorrow.” Polished and clever, though not quite so engrossing or memorable as one might have hoped, writer-director Jacob Gentry’s first feature since 2007’s exquisite-corpse triptych “The Signal” should appeal to a smaller segment of the same demo that made “Ex Machina” a sleeper hit this year.
