The 30-second summary
Natural Cycles is the first app the FDA cleared as a contraceptive. She measures her basal body temperature every morning, the app reads the pattern, and it tells her which days are fertile and which are not. Couples use it to avoid pregnancy or to time conception. It is a medical device, not a general cycle tracker, and it asks for daily commitment from her.
Yuni does something different. It reads her phase and turns it into one thing you can act on today: what she may feel this week, when to hold a hard conversation, what helps on the rough days. You never log a temperature. You never see her fertility data. The two apps sit in different rooms of the same house.
| Natural Cycles | Yuni | |
|---|---|---|
| Built for | Her, managing fertility or contraception | Her partner: boyfriend, husband, fiancé |
| What it is | FDA-cleared digital birth control | Daily partner-support guidance |
| Daily effort | Take her temperature every morning | Glance at today's mode, that's it |
| Account required | Yes | No |
| Cloud sync | Yes, health data on Natural Cycles servers | No, stays on your phone |
| Partner features | None | The whole app is the partner feature |
| "What to say" / "What not to say" scripts | No | Yes, phase-aware |
| Pricing | ~£120/yr, subscription required to use it | Free trial · Weekly £4.99 · Annual £79.99 |
| Pairing with partner | No partner mode | Pair link: her data on her phone, your guidance on yours, no central server |
When Natural Cycles is the right choice
If she wants hormone-free birth control or a precise, FDA-cleared way to time conception, Natural Cycles is built for exactly that. The clinical studies are real and the method works when she uses it correctly. It needs daily temperature readings and consistency from her, and the decision to use it is hers.
There is no partner side to Natural Cycles. You cannot install it for yourself, and there is nothing in it that tells you how to behave during her premenstrual week. That is the gap Yuni fills.
When Yuni is the right choice
If you have ever read her mood wrong and wished someone had warned you that morning, Yuni is for you. Every day it tells you what week she is in and what helps. Then it gets out of the way. You do not log anything and you do not manage her cycle. You just show up better.
Privacy is the reason there is no account. Men download a support app quietly and rarely tell anyone, so Yuni asks for nothing. When you pair, her cycle data stays on her phone and your guidance stays on yours. Nothing sits on a server to leak.
Yuni also writes the scripts partners actually search for at 11pm. "What not to say to her on her period." "How to apologise when you don't know what you did." Natural Cycles, focused on contraception, has no reason to write any of that.
The simple verdict
Get Natural Cycles if…
She wants hormone-free, FDA-cleared birth control, or she's timing conception and will take her temperature each morning.
Get Yuni if…
You're the partner. You want short daily guidance, not a medical device. You want to stop guessing, and you don't want another account.
These two run side by side: Natural Cycles on her phone, Yuni on yours. One manages her fertility. The other helps you support her.
How they work together
If she already tracks in Natural Cycles or Apple Health, you pair through Yuni's link and Yuni reads her phase from her phone, then shows you a daily nudge on yours. Her fertility data never touches Yuni.
If she doesn't track at all, Yuni still works from a single estimated cycle date. Less precise, still useful.
Quick answers
Is Yuni a Natural Cycles competitor?
No. Natural Cycles is birth control for her. Yuni is daily support guidance for you. Different jobs, different users.
Does Natural Cycles have a partner mode?
No. It's a single-user medical device. The partner role is exactly what Yuni was built for.
Does Yuni track fertility or predict her period?
No. Yuni is not a fertility tool and makes no contraceptive claim. It reads a phase and tells you how to help. For birth control, that's what Natural Cycles is for.
What does it cost?
Free trial. Weekly £4.99 or Annual £79.99 after that. No ads, no data sale.
One tap. No account. If it's not useful, delete it and we never know you tried.
Natural Cycles is a trademark of NaturalCycles Nordic AB. Yuni is not affiliated with or endorsed by Natural Cycles.