The app has been downloaded “tens of thousands of times” with Ms Eccles saying that the feedback has been “amazing so far”.

Lesley Eccles’ previous firm was valued in excess of $1.2 billion dollars, The Courier reports.

The Relish app has been described as the “world’s first personal trainer for relationships”. The app has already been recommended by relationship counsellors across the USA.

Ms Eccles said: “I keep hearing that couples enter counselling too late to save the relationship, but if they had started six months earlier, then something could have been done. Relish can act as an early intervention and it’s about giving you control of your relationship before it gets to the stage of couple therapy, although it is also being used as a companion tool for couples in counselling.”

The firm has an Edinburgh-based team of 7 employees and intends to hire more staff. Meanwhile, in the USA the project has six full and part-time employees.

The app’s process, which costs $100 per year, for two people, begins with an initial assessment and subscribers receive a customised plan each week containing content and activities. Subscribers also have unlimited texting with a coach who will suggest additional lessons.

Ms Eccles, said: “The programme has been formulated with help from leading academics from three universities, along with a qualified coaching team. Too often, people go into couple counselling wanting to change the other person, but in reality, you can only change yourself and Relish helps to do that.”

Ms Eccles, who has lived in America for three years, previously co-founded FanDuel, a fantasy sports betting firm in the states which has more than a million customers who predict the outcomes of sporting events for cash prizes. However, the firm merged last year and is currently the subject of potential legal action.

Ms Eccles said: “Coming out of FandDuel, we had been beaten up by the experience and I realised the only thing that kept us sane throughout was relationships.”