A fitness app founded by Chris Hemsworth has laid off more than a dozen Australian staff and closed its Melbourne office in a shift to the US.

Centr has long had headquarters in Melbourne and California, but is now moving operations almost entirely to the US, with just a handful of Australian staff to continue working remotely.

A spokesperson for the company confirmed to 9news.com.au that it will no longer have a Melbourne office, and that 15 staff have been caught up in the transition.

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"As Centr continues to scale globally, we've made the strategic decision to consolidate operations in the US to improve operational and geographic efficiency," they said.

"This transition affects 15 roles, with a few team members continuing remotely as part of the US-based team.

"Centr remains focused on continued growth across its digital platform, performance-grade equipment, and global partnerships."

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