The Duke of Cambridge will be unveiling the website today at an event in Bristol.
Meanwhile, William - who has Prince George, five, Princess Charlotte, three, and Prince Louis, four months, with his wife Duchess Catherine - announced in January 2017 that he would be stepping down from the job and said it was a "huge privilege" to work with the East Anglia Air Ambulance.
In a cafe on the site the second-in-line to the throne chatted to Ms Anderson and others who have recorded videos talking about their experiences of workplace mental health to promote the new website. You see so many sad things every day that you think life is like that.
A report by the charity Mind, which was launched in conjunction to Prince William's announcement, revealed that 48% of 44,000 people surveyed said they have experienced a mental health problem in their current job.More news: Hurricane Florence downgraded to Category 2, still considered risky
'You're always dealing with despair and with sadness and injury.
'The attrition builds up and you don't really have the opportunity to off-load it'.
He said: "I took a lot home without realising it".
The project came to be as new studies revealed that nearly half of all United Kingdom workers experienced poor mental health at their current job, and as many as one in four workers struggle with problems such as anxiety and stress without informing their employers. It brings together information, advice, resources and training that workplaces can use to improve wellbeing and give employees the mental health support they need.More news: 'We have a duty:' Myrtle Beach officers prepare for Hurricane Florence
It found nearly half of the 44,000 workers questioned had experienced poor mental health in their current job.
During the event, the duke visited workshops demonstrating the gateway and met people trying out the new system.
Its launch follows Prince William's previous work for the mental health campaign Heads Together, which he launched with his brother, Prince Harry, in 2016. She also works part-time in an office, even though sometimes she can go through stages of poor mental health.More news: Fortnite v5.40 content update brings new suppressed AR