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Turn every morning temperature into deeper hormonal insight
Connect the medical-grade Daysy fertility tracker to Ona, and every basal body temperature reading becomes AI-powered insight into your cycle and your health.
Ona
Reading your Daysy data
Your temperature confirms you ovulated on Day 15 — and your 13-day luteal phase sits right in the healthy range.
Day 15
Ovulation
13 days
Luteal
+0.6°F
Temp shift
Why basal body temperature is such powerful data
Your BBT is your body's resting temperature, measured the moment you wake. After ovulation, rising progesterone lifts your baseline — and that small shift carries big information.
It confirms you actually ovulated — not just that an app predicted you would. It shows how long your luteal phase lasts. And over months, it reveals patterns: delayed ovulation from stress or travel, anovulatory cycles hiding behind “regular” bleeding, or the shifting rhythm of perimenopause. Exactly the objective, day-by-day signal our AI needs to separate real trends from noise.
The post-ovulation temperature rise
Progesterone acts on your body's thermoregulation center and lifts your baseline until your next period — a biphasic pattern you can read on a chart.
The gold standard of at-home BBT measurement
Any thermometer can take a temperature — but measurement quality makes or breaks the data. Daysy waits for your reading to fully stabilize instead of estimating, removing the biggest source of error in manual charting. Hormone-free, and built to eliminate user error.
menstrual cycles in its self-learning database
of fertility awareness research behind it
per reading, waiting for full temperature stabilization
What happens when you connect Daysy to Ona
Ona imports your Daysy readings automatically — no transcribing numbers. Your temperature curve joins your symptoms, assessments, lab results, and wearable data from Apple Health or Health Connect.
Daysy captures the signal with medical-grade precision. Ona interprets it in the context of your whole health picture.
Connect your Daysy in minutes
- 1
Open the integrations section
In the Ona app, head to integrations and find Daysy.
- 2
Pair your Daysy
Select Daysy and follow the on-screen pairing instructions.
- 3
Keep measuring as usual
Under your tongue each morning, before getting out of bed.
- 4
Watch your insights deepen
Temperature data flows in automatically — no manual charting.
Don't have a Daysy yet? Learn more at daysy.me. Already own one? Connecting it earns you 50% off Ona premium — normally $19.99/month or $169.99/year.
Who gets the most out of this integration
Temperature-informed insight helps across the moments our community navigates every day.
Coming off hormonal birth control
See when real ovulation returns, not just when bleeding resumes.
Trying to conceive naturally
Combine Daysy's fertile window with Ona's guidance on cycle health.
Living with PCOS
Irregular cycles make ovulation confirmation especially valuable — bleeding alone doesn't prove you ovulated.
Navigating perimenopause
Track how your cycles are actually changing instead of guessing.
Chasing unexplained symptoms
Connect fatigue, mood shifts, or spotting to specific cycle phases with objective data.
Simply understanding your health
Ovulation shapes metabolism and brain function — knowing when you ovulate matters even if you're not trying to conceive.
Daysy integration — questions & answers
Do I need a Daysy to use Ona?
No. Ona works fully without one — you can log symptoms, run assessments, and sync Apple Health or Health Connect. But high-quality BBT data from Daysy meaningfully deepens the insights our AI can give you.
Does Ona replace the DaysyDay app?
They serve different purposes. DaysyDay is Daysy's companion app for fertility statistics. Ona uses your temperature data for something broader: understanding your hormonal health, uncovering root causes of symptoms, and answering your questions — reviewed by experts like Lara Briden, ND, author of Period Repair Manual.
How do I claim the 50% discount?
Connect your Daysy in Ona's integrations section and the discount is applied to Ona's premium subscription.
Is my data private?
Yes. Your data is securely stored, never sold to third parties, and you can delete it entirely at any time.
Ready to put your mornings to work?
Sixty seconds with Daysy every morning. A lifetime of understanding with Ona. Connect the two, claim your discount, and let every reading bring you closer to answers.
Explore Daysy at daysy.me.
Statements on this page have not been evaluated by the FDA or any other health agency. Ona is not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider about your health.