Kerim Erturan

Why I built Vesper

My background is in natural sciences — biology, mostly. But my knowledge of medicine started long before university. I grew up with my mum, a nurse in London, and she had shelves full of books on physiology and pharmacology. I was reading them as a child. I never wanted to work in a clinical setting, but it gave me a foundation I've carried ever since.

Today I run The App Agency, a digital product studio. We build technology across finance, advertising, even hedge funds. Some of those systems are technically complex. But there's a satisfaction in simplicity that affects everyday life — and that's harder to find.

From my personal life, I noticed a gap. A huge gap between how in tune women are with their bodies and how much accessible, unified guidance actually exists. There are brilliant schools of health out there — cycle awareness, nervous system regulation, gut health, traditional practices — but they're scattered across different communities and philosophies.

Vesper collects these approaches and delivers them in one unified way. It doesn't divide or prescribe. It's designed to be that fun, all-knowing friend — light, unintrusive, and easy to use.

I haven't built it alone. Some of the programme has been put together with Sacha, a PhD researcher at Cambridge University working in fertility. The evidence matters.

Vesper is young, and I have bigger plans for it. But for now, just enjoy the daily insights and practices. They may seem small, but a little goes a long way.