Dublin femtech startup Joii today launched its life-changing tech for how menstrual health is understood, monitored, and discussed in Ireland and beyond.
A world-first, Joii’s menstrual pad and mobile app measure period blood volume and clot sizes, offering users unprecedented insights into menstrual health through AI-powered image analysis. Backed by clinical research and real-world validation, Joii offers a data-driven way to monitor menstrual health, finally giving people with periods the tools to see what’s really going on.
I spoke to CEO, and founder, Justyna Strzeszynska, to learn more. Like billions of women around the world, Strzeszynska struggled with menstrual health issues — and finding the cause or treatment depends on truly understanding what’s happening in the body.
She recounts:
“Doctors would ask me about my menstrual flow, but I had no benchmark much less a real way to reliably and accurately measure it.”
Heavy menstrual bleeding affects 1 in 3 women, yet diagnosis and treatment are frequently delayed due to vague language like “heavy” or “normal”, without any tangible or qualifying details.
Further, while femtech tool cycle tracking apps like Clue and Flo track symptoms, cycle patterns, moods, and predictive fertility windows, they don’t measure flow volume directly.
Motivated by her personal journey, Justyna established Joii, with a vision to create a solution that transformed menstrual health management.
Joii has created a first in women’s health — pad‑scanning volume analytics.
“For too long, women have been told to just ‘track their period’ without any real tools to measure what’s actually happening. With Joii, we’re changing that,” said Strzeszynska.
“We’re helping people see their periods clearly, for the first time.”
Joii offers a simple yet powerful solution for menstrual health tracking, combining AI-powered analysis with eco-friendly design.
Users can scan Joii evaluation pads using the free app to accurately measure menstrual blood volume, detect clot sizes, and receive immediate results.
According to Strzeszynska, the startup uses computer vision to track flow, clot size, and composition.
“Our AI model was trained largely on synthetic data – unsurprisingly, there’s a lack of photographs of period-tracking images — and we undertook extensive real-world testing to ensure the app performs reliably across different lighting environments and pad usage scenarios.”
“Users get an instant report detailing blood volume in millilitres, average flow, clot size, and symptom trends.”
How Joii works
- Wear Joii Pads – Specially designed for comfort and clear visibility.
- Scan with the Joii App – The user scans the used pad using the Joii app.
- Get Insights – The app provides instant insights, including menstrual volume (in millilitres), clot detection, and cycle trends.
Over time, the app builds personalised insights into cycle patterns and flow trends, helping users better understand their bodies. With visual data that can be shared with healthcare providers, Joii supports more informed diagnoses and treatment decisions.
This technology is particularly beneficial for individuals experiencing heavy bleeding, those on long diagnostic journeys, such as endometriosis, which currently can take up to 10 years, as well as those seeking a better understanding and control over their menstrual health.
Astonishingly, this is the only product of its kind on the market. While some people who menstruate have attempted to track their flow manually using menstrual cups as part of a gynaecological research project, there has been zero consistency in how periods are tracked, much less a scalable or widely accessible solution for tracking — until now.
Joii’s technology is protected under multiple patents and is a Class I Medical Device, certified in the UK and protected under multiple patents.
Statistically, women’s health has been under researched and underfunded. Just 2 per cent of UK medical research funding goes toward pregnancy, childbirth, and female reproductive health — even though around one in three people who menstruate experience a reproductive or gynaecological health issue.
Joii is partnering with leading research institutions to explore the untapped potential of menstrual blood as a non-invasive diagnostic tool. By developing predictive AI models, the company aims to support earlier detection of conditions such as endometriosis, polycystic ovary syndrome (PCOS), and anaemia, transforming menstrual blood into a powerful source of clinical insight.
Further, Joii empowers users to advocate for themselves and also provides healthcare professionals with objective data that can improve diagnosis and treatment.
Strzeszynska asserts that the research also “helps build a crucial bridge between data and the healthcare system, offering credibility to patient healthcare monitoring apps.”
“It generates clinically relevant insights that can support more meaningful, evidence-based conversations with healthcare providers.”
Supported by two clinical and real-world studies including research funded by the NIHR (National Institute for Health and Care Research), Joii users report:
Research into the use of Joii has revealed:
- 62 per cent improved communication with their GP.
- 288 per cent increase in symptom screening efficacy.
- 134 per cent increase in menstrual health literacy.
Further Joii feasibility study showed patient’s experienced a:
- 33 per cent improvement in abnormal symptom screening.
52 per cent increase in period health literacy.
36 per cent improvement in discussing symptoms with GPs.
88.6 per cent of GPs in the studies say Joii improves conversations about periods and, critically, 87.6 per cent found it easier to spot heavy bleeding and abnormal symptoms. Furthermore, 93 per cent of GP participants say Joii supports the diagnosis of Heavy Menstrual Bleeding. 88.6 per cent would integrate it into their practice if NHS-approved.
Dr Fatema Mustansir Dawoodbhoy (NHS), Clinical Advisor to Joii, said,
"This app will definitely offer me better insights into how the patient is feeling as I will be able to understand their symptoms variation throughout the month.”
Dr Kushal Chummun, Consultant in Obstetrics and Gynaecology in the Rotunda and Connolly Hospital, agrees, “I think the app is really, really good”, underpinning the clinical confidence in Joii’s innovation.
To date, Joii has raised €2.4 million and is backed by EIT Digital as part of its equity portfolio.
With the EIT Digital Open Innovation Factory, which brings together partners from different European countries to collaborate on a deep tech solution or product, Joii worked with Finnish creative software studio Ikune. Ikune mapped users’ needs and designed gaming mechanisms and technical requirements for Joii’s software to improve users' engagement and retention, increase user data, lead to better clinical outcomes, and enhance Joii app accuracy.
Joii’s AI-enabled app is free to download on iOS and Android devices, and Joii Evaluation Pads RRP €6.95 are available now from selected health stores and pharmacies nationwide as well as online from www.joiicare.com.
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