Symptom, Mood and Cycles Tracker App for iPhone Duo

Quick answer

Folded: one hand, on the cover screen

Symptoms rarely wait for a free hand. Folded, Trace Health fits the cover screen of iPhone Duo, so the app you open on the bus or in bed is the full app, not a cut-down view.

• Log a symptom in one tap. Each further tap steps its severity from Mild to Moderate to Severe, then Gone, with the time kept to the minute.
• Set today's mood. Once a day Trace Health asks how you felt overall, answered in one tap.
• Log your period like any symptom, with its flow, and Spotting on the days in between.
• Catch up in seconds. The daily symptom review fits the cover screen: swipe left if a symptom is gone, right if it is still there.

Open: your symptoms and habits side by side

Open iPhone Duo and Trace Health spreads out across both screens, so you see more of your health at once instead of switching tabs.

• Homepage: your symptoms on one side, your daily habits on the other (sleep, caffeine, exercise, medication and whatever you track), each scrolling on its own.
• Daily symptom review: the cards open right beside your symptoms, and a tap on a symptom updates its card.
• Symptom pages: the history of a symptom and its insights together, each with its own period.
• Insights: the overview on one side, the symptom, mood or cycle you pick on the other.

Your mood on iPhone Duo

Trace Health is a mood tracker as much as a symptom tracker. One tap a day records how you felt overall, with an optional private note, and after a few weeks it shows what lifts your mood, what weighs on it and which symptoms move with it. On the open iPhone Duo, your mood insights sit next to your overview, so you can read them against the rest of your week. Your daily mood syncs both ways with Apple Health State of Mind if you turn it on.

Your cycle on iPhone Duo

Log your period in one tap, like any symptom, and Trace Health follows your cycle: cycle day and phase, cycle and period length, when your next period is due, the fertile window and a cycle calendar. After a few cycles it shows which symptoms get worse the week before your period, as it starts or around ovulation. On the open iPhone Duo, your cycle insights open next to your overview, beside the symptoms they explain.

Trace Health is not a fertility, contraception or pregnancy app: its fertile window is an estimate from your period dates only.

Private on iPhone Duo too

Trace Health needs no account, email or sign-up. Your health data stays on your iPhone Duo by default, with an optional backup to your own private iCloud, and nothing passes through a Trace Health server. The Apple Watch app works with iPhone Duo as with any iPhone, so you can also log from your wrist. More in our private symptom tracker guide.

Limits, to be clear

• Trace Health is an iPhone app made for iPhone Duo. There is no Android version, so it does not run on Android foldables.
• Trace Health is a tracking tool, not a medical device, and does not diagnose.

Frequently asked questions

Is there a symptom tracker for iPhone Duo?

Yes. Trace Health is made for iPhone Duo since version 1.17 (October 2026). Folded, you log a symptom with one hand on the cover screen; open, your symptoms and habits sit side by side, and each symptom page shows its history and insights together. Other symptom trackers, such as Chronic Health Symptom Tracker and Bowelle, also support iPhone Duo.

Can I track my mood on iPhone Duo?

Yes. Trace Health asks how you felt once a day, answered in one tap on the cover screen or the open screen. After a few weeks it shows what lifts your mood and what weighs on it, and on the open iPhone Duo those mood insights sit next to your overview.

Can I track my period and cycle on iPhone Duo?

Yes. Log your period in one tap like any symptom, and Trace Health shows your cycle day, when your next period is due, your fertile window and a cycle calendar. After a few cycles it shows which symptoms your cycle makes worse, and on the open iPhone Duo your cycle insights open next to your overview.

Does Trace Health use both screens of iPhone Duo?

Yes. Open, the homepage shows your symptoms and habits side by side, the daily symptom review sits beside your symptoms, symptom pages show history and insights together, and Insights shows the overview next to the symptom, mood or cycle you pick. Folded, everything fits the cover screen.

Does the Trace Health Apple Watch app work with iPhone Duo?

Yes. The Apple Watch app works with iPhone Duo as with any iPhone: one tap on your wrist logs a symptom or an activity, and every log joins the same history on your phone. It is part of Premium and needs watchOS 11 or later.

Is Trace Health free on iPhone Duo?

Tracking your symptoms is free on iPhone Duo as on any iPhone: every symptom and condition, one-tap logging, your daily mood and cycle, charts, triggers and doctor reports for the last 30 days, with no account and no ads. Premium is optional, for people who need more.

Is there a symptom tracker for Android foldables?

Trace Health is iPhone only, so it does not run on Android foldables. On iPhone Duo it is made for both screens.