See your cycle in a clearer light
Daysy is a hormone-free, clinically validated fertility tracker that helps you understand your fertile and non-fertile days with 99.4% accuracy*
So you can plan with more confidence
medical device 30-day
risk-free return Free delivery
across Singapore
Your cycle shouldn’t feel like something else to decode
But it often does
You’re left surrounded by apps and strips, wondering whether you’re reading things right - and what that means for the month ahead.
Daysy replaces that guessing with a single, steady signal.
A morning temperature reading that shows your fertile and non-fertile days in 60 seconds. So planning feels less like guesswork.
Understanding your cycle shouldn’t be complicated
Measure
Take your basal temperature under the tongue each morning (about 60 seconds).
Analyze
Daysy's algorithm evaluates your fertile and non-fertile days.
See your pattern
Coloured lights on the device and app show your cycle's ebb and flow.
FDA classified
HSA Class A
medical device
CE certified
Clinical validation
The Science behind Daysy
Daysy’s algorithm has been evaluated in a
peer-reviewed study of 5,328 users and ~107,000 cycles, showing:
99.4% accuracy in identifying non-fertile days.
Daysy gives you clearer information about when your fertile window is likely to have passed.
(The study did not measure pregnancy outcomes or contraception effectiveness)
How Daysy compares
Get less noise in your TTC routine
* Accuracy (99.4%): Why it matters
Higher accuracy means fewer false signals giving you clearer timing each month.
I just want one thing I can trust
You’ve probably tried a few things already, and you still ended up guessing.
Daysy gives you something different: a calmer, clearer rhythm you can trust day after day.
Daysy delivers
Your Daysy Device
Your 60-second reading - the heart of how Daysy works
Charging Cable
Long-lasting charge
Quick Start Guide
A walkthrough of your first week with Daysy
Warranty & Support
2 year warranty, and local support when you need it
Optional App Access
The Daysy Day App helps you see your cycle unfold over time
How to use Daysy
How Daysy fits into your life
A small morning habit that becomes a clearer view of your cycle
Step One
Measure
Take a 60-second temperature reading before getting out of bed.
Step Two
Analyze
Daysy’s algorithm classifies your fertile or non-fertile days based on your pattern.
Step Three
See the Signal
Red, green, or yellow lights show where you are in your cycle.
Step Four
Watch the Pattern Build
After a week or two, your rhythm becomes clearer.
Real stories
For women who are tired of guessing
Verified buyer
Verified buyer
Verified buyer
Know your cycle. Plan with confidence.
medical device 30-day
risk-free return Free delivery
across Singapore
"There is no guesswork and it removes human error, which for me - with a busy lifestyle - is a real advantage"
Verified buyer
-
CE
certified -
HSA Class A
medical device -
FDA
classified -
2-year
warranty -
Free delivery
(3 days) -
30-day returns
What if I miss a day?
If something doesn't feel clear
(or you just want someone to walk through
it with you), we're here.
You're always welcome to ask
Yes, but it will have more conservative outputs. If your cycles are consistently longer than 40 days, or if your doctor has raised concerns, it’s best to speak with a clinician. Daysy is not a diagnostic tool.
Missing an occasional reading won’t erase your progress. Daysy works best with a gentle routine, but perfection isn’t required.
Yes. Many women pair Daysy with OPKs for peak-day targeting, or continue with TCM or gynaecology support. Daysy fits easily alongside your existing care.
No, Daysy is not registered as a contraceptive device.
Daysy can’t diagnose conditions or confirm hormone levels. If you’re worried about your cycle, please speak to a healthcare professional.
Trying to conceive can be complex and emotional. Daysy is a tool for understanding your fertile window, not a guarantee of pregnancy. If you have concerns about conception timelines, a fertility clinician can help you explore next steps.
Your data stays private and under your control. Stored on your device, syncs securely, never shared or sold. Your body is your business. You can find detailed information on how we treat your data here
If something doesn't feel clear
(or you just want someone to walk through
it with you), we're here.
You're always welcome to ask