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Lunarmates is the menstrual cycle-tracking app designed and built for the other person in the relationship.
Dozens of apps help women track their period but that information rarely reaches their partners. Lunarmates is built for the men who want to understand the menstrual cycle — to know and anticipate the days that call for action, which days call for tolerance, and when flowers or chocolate might land better than usual (hint: it may not be when you think). Every woman is different, and every day of the ~28 day cycle is different, too.
The story
Founder Matthew J. Spaniol spent 21 years trying to track his wife's cycle the hard way — and wishing an app existed to help. Lunarmates was approved in Google Play at the end of June 2026, and is available as an installable web app for iOS. Now his wife wants him to share it with the world. It's free, with no ads.
Lunarmates doesn't try to teach men about cycle phases, or suggest behavioral changes — instead it displays the data, plainly, and prompts each man to formulate his own insights and conclusions. There's no AI in the app trying to make predictions or suggestions: he's just given the forecast, what it typically means, and a place to log customized observations.
Either partner can download the app and invite the other, and each sees a view tailored to their side of the cycle — hers for tracking, his for understanding.
Story angles we can support
- The male empowerment angle: Dozens of menstrual tracking apps are designed and built almost entirely for and about women. Men have been an afterthought — expected to just figure it out on their own without much information. Lunarmates starts from a simpler premise: Give men the same resources and they will figure it out and use it well.
- The lifestyle angle: What we track and monitor determines where we direct our time, resources, and problem-solving energy. For men who already track their workouts, sleep, screentime, and habits, a partner's cycle is one more thing worth monitoring — not to optimize her, but to anticipate which moods and behaviors are in play, reflect about what attitudinal dispositions and communication strategies will improve their cooperation, and avoid conflicts that come from misreading the moment. Day after day — regardless of the cycle.
- The empathy angle: Why a period tracker for men is really an app about becoming a better partner — one that takes seriously that the menstrual cycle is a real biological process with real effects on mood and energy, not something to shrug off or take personally. Lunarmates doesn't use AI to tell men what to do; it prompts them to record their own observations, which return as reminders on the corresponding day next cycle. Data is converted into knowledge, meaning fewer assumptions, less confusion, and a partner who's learned to reference the cycle instead of blindly reacting to the moment. The idea is simple: understanding tends to draw people closer, in every sense — emotionally and physically, as attunement deepens.
- The community angle: Inside the Lunarmates forum, men share their phase-day observations, pseudonymously, with a growing community of others doing the same. What starts as one man's insight can become something others recognize in their own relationships — a small, crowd-sourced body of shared wisdom that grows into more useful knowledge for Lunarmates users.
- The privacy angle: How inspiration from femtech is used to build a "mantech" product on a minimal, single-data-point collection policy — Lunarmates runs on only the period start date. None of her symptoms, moods, flow, or sexual activity are collected. No name required. Danish company, EU-hosted, GDPR-governed, deletable in-app at any time, leaving no intimate data trails.
iPhone Homescreen Installation
(not available in app store yet)
Tap the Share icon in Safari (or ••• then Share) → scroll down to "Add to Home Screen" → turn on "Open as Web App" → tap Add → open Lunarmates from homescreen → tap "Enable" push notifications.
About the forum
The Lunarmates forum is where men share observations and questions — anonymously, and only if they choose to. Every observation a man logs is private by default; posting to the forum is a deliberate choice. The forum sits in the app's main navigation, open for any user to read, including partners. Think of it as a locker room where the conversation is "how do I get this right?" — and the door is open.
Sample posts:
- "Everything is beautiful — seems to enjoy nature. Perhaps it is because it is spring." (Follicular, Day 6)
- "Cool and calm. These are nice days — no need to stress." (Follicular, Day 8)
- "Dancing fun :)" (Ovulation, Day 14)
- "Do soap bubbles in the toilet indicate arrival?" (Menstrual, Day 1)
Fast facts
- Public launch: July 14, 2026. Live on Google Play since June 2026; installable web app for iOS; App Store release planned
- Price: Free. No ads. No advertising data collected — none exists to sell.
- Health data collected: One data point — the period start date. Nothing else.
- Accounts: No name required; default display name is "Lunarmate."
- Data: Encrypted, stored on EU servers, governed by EU data protection law, fully deletable in-app.
- HQ: Copenhagen, Denmark
About the founder
Matthew J. Spaniol is the Founder and CEO of Lunarmates. A senior researcher at Roskilde University, he lives in Copenhagen with his wife of 21 years and their two children. Lunarmates grew out of 15 years of doing what researchers do — observing carefully — applied to his own marriage.
"Every day is a different day, but the underlying hormonal pattern is decipherable. Every woman is different, and the app helps you capture your own observations over time. My wife says I have become a better partner."
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Media contact
[email protected] — phone available upon request.