• Stemba Support

Some days

you just need

a quick answer

Some days you want someone
to sit with you through the
confusing bits.


You'll find both on this page

  • Stemba Support

Some days you just need

a quick answer

Some days you want someone to sit with you
through the confusing bits.


You'll find both on this page

  • Get help

How can

we help today?

  • Ask Luna

    Luna is our AI assistant. She's very good at explaining things, and can help you:

    • understand your Daysy lights
    • troubleshoot readings
    • find the right FAQ
    • understand cycle basics
    • learn what a change in
      your pattern might mean

    If she can't answer something, she'll guide you to a human who can.

    Ask Luna

  • Talk to a person

    Sometimes you want a real human

    Our support team is here to help with device questions, orders, or anything that's not quite behaving how you expect.


    We reply Monday - Friday, with Singapore-based hours.

    Stemba Support

  • Get quick answers

    These are the questions we get asked most often:

    • Why is my Daysy light yellow today?
    • How long until Daysy understands my cycle?
    • Can I use Daysy if my cycles are irregular?
    • Where's my order?
    View all FAQs
  • Common questions

Using Daysy

Daysy begins recognizing your rhythm within the first few weeks of consistent use.

It’s completely normal to see more yellow days early on - that’s just the algorithm making sure it has enough information to classify your fertile and non-fertile days with confidence.

As more readings build over time, your pattern becomes clearer, and your lights become more personalised.

If you’re ever unsure about what Daysy is showing, Luna or our support team can help you understand what’s happening.

Here’s the simplest way to read Daysy’s lights:

● Green = Days classified as non-fertile
● Red = Days classified as fertile or possibly fertile
● Yellow = Days when Daysy needs a little more information before deciding

Yellow lights can feel frustrating at first, but they’re not a sign of a problem.

They’re simply Daysy taking a cautious approach. Exactly what you want from a device that prioritises accuracy and safety.

Missing a day won’t undo anything, and you don’t need to start again. Just take your next reading as usual. Daysy works by recognising patterns over time, not by expecting you to be perfect every
single morning.

If you’ve slept badly, travelled, or had more alcohol than usual, it’s okay to skip that day.

Your pattern will still be there when you’re ready.

Your waking temperature can shift slightly depending on:

● disrupted sleep
● illness
● alcohol
● travel or time zone changes
● night sweats
● certain medications

One or two unusual readings are normal - it’s the overall pattern that matters. If something looks unusual and you’re not sure why, Luna can help you interpret your recent readings. Or you can message our support team for a second opinion.

Yes, many women with irregular cycles use Daysy and find it helpful.
If your cycles fall within roughly 21 - 40 days, Daysy can usually build a clear pattern over time, even if each cycle looks a little different.

If your cycles are consistently longer than 40 days, or vary dramatically from month to month, Daysy may need more yellow days to classify your fertile window.

If you’re not sure whether Daysy is right for your cycle, talk to Luna or message our team, and we’ll help you work it out.

Some women with PCOS use Daysy successfully, especially when their cycles still have a recognisable rhythm.
If your cycles are very long or unpredictable, Daysy may produce more yellow days because the algorithm needs more data to classify confidently.

If you have PCOS and are curious about how Daysy might work for you, you’re welcome to reach out. We’re happy to talk through what to expect.

Yes, although both stages come with hormonal changes that can make your temperature pattern shift more than usual.

Daysy will probably need time to understand your cycle again after birth or as you move through perimenopause. That usually means more yellow days in the beginning.

If you’d like help interpreting these early readings, Luna and our support team can guide you.

  • Tech & Setup

Tech & Setup

Open the DaysyDay app, switch on Bluetooth, and follow the pairing steps.
Your first sync may take slightly longer as everything updates, but after that, it’s only a few seconds each day.

If syncing ever feels confusing or gets stuck, Luna can walk you through it - or you can send us a quick message.

A beep usually means one of four things:

● A short beep means your reading is complete
● A grumble-buzz means the sensor is not stable
● the battery needs attention
● a button has been pressed

Tell Luna the sound pattern (one beep, two beeps, repeated, etc.), and she’ll help you pinpoint exactly what’s happening.

Switching Daysy to a new phone is really easy.

Just unpair Daysy from your old phone, install the DaysyDay app on your new one, and pair again. Your data follows your account, not your device, so nothing gets lost.

You can restart your Daysy through the app.
If things still don’t feel quite right, message us, and we can guide you through a reset step by step so you feel confident doing it.

  • Cycle Health & Life Stages

Cycle Health & Life Stages

It's very unlikely that something is wrong.

One unusual temperature is usually just your body reacting to sleep, stress, or daily life.

What matters is the overall pattern. If several days in a row don't look like your usual rhythm, Luna can help you make sense of what you're seeing.

Ovulation timing can change naturally because of stress, illness, travel, disrupted sleep, exercise, or normal hormonal variation. Your cycle doesn’t have to be perfectly regular to be healthy.

Daysy adapts to your personal rhythm over time, even if that rhythm changes a little each cycle.

Yes, many women use Daysy alongside OPKs, TCM care, or other cycle-tracking tools.

Daysy gives a clear physiological signal (your temperature). Other tools can add context. Together, they often help women feel more confident about what their body is doing.

Not exactly.
Consistency helps, but what matters most is taking your reading right after waking, before moving around, eating, or drinking.

If you wake up earlier or later than usual, you can still take a reading. Just make sure you’ve had at least one hour of uninterrupted sleep.

  • Orders, Shipping & Returns

Orders, Shipping & Returns

We ship from Singapore, which means local orders usually arrive within 2 - 3 working days.

If you need help tracking your order, just ask, and we’re happy to check it for you.

Yes. The price you see at checkout includes delivery and any applicable taxes for your order.

There are no surprise fees added after purchase.

You have 30 days to try Daysy at home. If it’s not the right fit, you can return it in its original condition for a refund - no hard feelings.

We’d rather you choose something that genuinely supports you.

Daysy comes with a 2-year warranty that covers manufacturing faults.

It doesn’t cover accidental damage, loss, or misuse. But if something unexpected happens, message us anyway. We’ll always do what we can to help.

● Daysy device
● USB charging cable
● Quick-start guide
● Warranty information
● Access to the DaysyDay app

If anything is missing or doesn’t look right when your package arrives, let us know, and we’ll sort it quickly.

  • Safety, Accuracy & Trust

Safety, Accuracy & Trust

Daysy’s algorithm has been evaluated in a peer-reviewed study of 5,328 users and around 107,000 cycles, where it correctly identified non-fertile days with 99.4% accuracy.

That level of accuracy comes from recognising real temperature patterns. We don’t rely on predictions or assumptions.

If you’re curious about how this works, our Science page breaks it down in simple language.

No, and we want to be very clear about that.

Daysy isn’t cleared or sold as contraception, and it isn’t designed to prevent pregnancy.

Its purpose is to help you understand your cycle by showing you temperature-based patterns.

If you need contraception, it’s important to use a method tested and approved for that purpose.

If you’re unsure where to start, a clinician can help you explore your options, and Daysy can still be a helpful tool alongside that conversation.

Daysy can’t diagnose conditions or replace a medical evaluation.

What it can do is help you observe your temperature patterns over time.
If something looks unusual or you’re feeling unsure, that information can be useful to bring to a clinician, and you can always talk to us or Luna first if you need help interpreting it.

Still need help?

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

WhatsApp Stemba Support
Chat with Luna