Apple employees have launched a campaign to push back against Tim Cook's plans for a widespread return to the office, according to reports.

Axar.az reports that it follows an all-staff memo last week in which the Apple boss said workers should be in the office at least three days a week by September.

But staff are demanding more flexibility, according to an internal letter obtained by news site The Verge.

Apple's policy has "already forced some of our colleagues to quit", it said.

"Without the inclusivity that flexibility brings, many of us feel we have to choose between either a combination of our families, our wellbeing, and being empowered to do our best work, or being a part of Apple," the letter said.

"Over the last year we often felt not just unheard, but at times actively ignored," it also reads, accusing management of a "disconnect" with employees on the topic of remote or flexible working.