The app is the latest development by Mikeysline, a charity set up following the deaths of two friends.
Michael "Mikey" Williamson and Martin Shaw, who were both 23 and living in Inverness, were found dead within days of each other in October last year.
Family and friends fear the young men took their own lives.
Mr Williamson was found dead only hours after returning from a night out to remember his friend Mr Shaw.
Launched in December last year, Mikeysline already offers support via text messages and is staffed by volunteers.

Matt Tubbs' sixth goal of the season came from the spot on 70 minutes for Ryan Astles' challenge on Yemi Odubade.
Chester, who had beaten Aldershot 8-2 in midweek, were completely overrun by an Eastleigh side who had lost five of their previous seven league matches.
Visiting keeper Tony Thompson denied Luke Coulson, Josh Payne and Odubade before Tubbs' deserved winner.
The fight to reach the play-offs remains tense, with Eastleigh now only two points behind fifth-placed Braintree, while Chester are only eight points clear of trouble.
Chester manager Steve Burr told BBC Radio Merseyside:
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"There were two things we felt hard done by. We had a goal disallowed in the first half when Ryan Higgins cut the ball back to Ross Hannah.
"And the lads are unhappy with the penalty decision. There was minimal contact. It was harsh, to say the least
"They have a very expensively assembled side with experience, who you could see are used to playing on that pitch and, in the end, it was settled by a penalty
"It was always going to be tough after what has happened this week, then the long journey down. We set off at seven o'clock this morning and you could see one or two tired legs out there. But I don't want to make excuses. We didn't create enough chances."

BT is paying the money to Deutsche Telekom and Orange to avoid legal action over the issue.
The two companies now hold stakes in BT as a consequence of the deal that saw them sell the EE mobile network to the UK company.
The charge led to BT's first-quarter profits falling 42% to £418m.
In January, BT wrote down the value of its Italian unit by £530m after it said it had uncovered years of "inappropriate behaviour".
It said it had found evidence of improper accounting practices, leading to "the overstatement of earnings in our Italian business over a number of years".
The Financial Reporting Council (FRC), the UK's accountancy watchdog, is investigating the auditing of BT's financial statements for the years 2015-17.
Separately, BT announced that Marc Allera had been appointed as chief executive of its combined BT consumer business, while Cathryn Ross - currently chief executive of Ofwat - will become its new director of regulatory affairs.
A smartphone app designed to help young people who are dealing with depression and suicidal thoughts has been launched in Inverness.
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Eastleigh secured back-to-back wins for the first time since December as they narrowly defeated Chester.
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Profits at telecoms group BT have fallen after it took a £225m charge related to its Italian accounting scandal.