Track your cycle. See the pattern.

Premenstrual Dysphoric Disorder (PMDD) is a severe cyclical mood-related condition in which symptoms worsen before a period and improve after bleeding begins. Symcycle helps you track daily symptoms to look for patterns associated with PMDD. It does not diagnose PMDD. A qualified clinician must make the diagnosis after a full evaluation, and reliable pattern assessment usually requires at least two complete cycles of daily ratings.

Each day, you'll rate 18 symptoms on a 1-6 severity scale. It takes about 60 seconds. Over two or more tracked menstrual cycles, Symcycle evaluates your data using scoring methodology aligned with the Carolina Premenstrual Assessment Scoring System (C-PASS), supporting clinical discussion with your provider.

Severity Scale
1 = Not at all
2 = Minimal
3 = Mild
4 = Moderate
5 = Severe
6 = Extreme
Tap a number to rate this sample symptom.
Mood swings, sudden sadness, or heightened sensitivity

That's it. You'll do this for all 18 symptoms each day, then mark your menstrual flow and tap Save. Under 60 seconds.

All data is stored locally on your device. Nothing is sent to a server. Nothing is shared. You control your data completely.

Your data is stored on this device only. Clearing browser data or uninstalling the app will permanently delete your tracking history. Use the Backup feature in Settings regularly.

You can back up your data anytime from Settings, and export a printable clinician report whenever you need it.

Who this tool is and isn't for:
  • Not validated for users under 18.
  • Not appropriate during pregnancy, breastfeeding, or within 3 months postpartum.
  • Not appropriate during perimenopause or after menopause.
  • Hormonal contraception and GnRH analogs can suppress the cycle and alter pattern detection.
  • This tool cannot distinguish PMDD from premenstrual exacerbation (PME) of an underlying condition. A clinician evaluation is required.
This tool is for clinical discussion with your healthcare provider. It does not diagnose conditions.
For the best experience, add Symcycle to your home screen.
Add Symcycle to your home screen

Symcycle

Daily Symptom Tracker for Premenstrual Dysphoric Disorder (PMDD)

Today
Rate each symptom daily using the 1-6 scale. Track for at least 2 complete menstrual cycles. When menstrual bleeding begins, mark it in the menstrual flow section below.
1 Not at all 2 Minimal 3 Mild 4 Moderate 5 Severe 6 Extreme
Tap for clinical definitions
1 No symptom present. Baseline functioning unaffected.
2 Symptom barely noticeable. No impact on daily activities or relationships.
3 Symptom present but manageable. Mild disruption to concentration or comfort.
4 Symptom clearly interferes with normal functioning. Noticeable difficulty in work, relationships, or daily tasks.
5 Symptom dominates much of the day. Significant impairment in ability to function normally.
6 Symptom is overwhelming or incapacitating. Unable to carry out usual activities.
C-PASS clinical threshold: A rating of 4 or higher on 2 or more premenstrual days indicates clinically significant severity for that symptom domain.
Daily Total Score: 0
Menstrual Flow
Symcycle
A product of JLilo Ventures, LLC
Copyright 2026 JLilo Ventures, LLC. All rights reserved. Unauthorized reproduction prohibited.

Calendar

Month Year
Cycle Day: --
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Score ≤30
Score 31-60
Score 61-80
Score 81+
Menstrual
Symcycle
A product of JLilo Ventures, LLC
Copyright 2026 JLilo Ventures, LLC. All rights reserved. Unauthorized reproduction prohibited.
This tracker implements scoring aligned with the Carolina Premenstrual Assessment Scoring System (C-PASS) methodology (Eisenlohr-Moul et al., 2017, American Journal of Psychiatry). Symcycle is an independent implementation and is not affiliated with or endorsed by the C-PASS developers. Results are for clinical discussion only and do not constitute a diagnosis. A minimum of two prospectively tracked cycles is recommended for meaningful pattern evaluation, with three or more cycles providing greater assessment confidence.
Pattern analysis limitations. This tool is not validated for users under 18, during pregnancy, breastfeeding, or within 3 months postpartum, during perimenopause, or after menopause. Hormonal contraception and GnRH analogs can suppress the cycle and alter pattern detection. This tool cannot distinguish PMDD from premenstrual exacerbation (PME) of an underlying condition. A clinician evaluation is required for any clinical conclusion.

Keep Tracking

Track symptoms daily for at least 2 complete menstrual cycles to generate a meaningful analysis. The DSM-5-TR requires prospective daily ratings across a minimum of 2 symptomatic cycles for confirmatory evaluation, with 3 or more cycles recommended for greater confidence. Continue tracking -- your data is being saved.

Symcycle
A product of JLilo Ventures, LLC
Copyright 2026 JLilo Ventures, LLC. All rights reserved. Unauthorized reproduction prohibited.
Patient Information
Cycle Management
Daily Reminder
Enable daily reminder
Reminder time
Reminders are off. Enable to get a daily prompt to track your symptoms.
Data Management
Data storage notice: Your data is stored on this device only. Clearing browser data or uninstalling the app will permanently delete your tracking history. Back up regularly.
Limitations and Who This Tool Is For
This tool is not validated for:
  • Users under 18.
  • Pregnancy, breastfeeding, or the first 3 months postpartum.
  • Perimenopause or post-menopause.
  • Users on hormonal contraception or GnRH analogs that suppress the cycle. Pattern detection will be altered.

This tool cannot distinguish PMDD from premenstrual exacerbation (PME) of an underlying condition such as depression, anxiety, or bipolar disorder. A clinician evaluation is required for any clinical conclusion.

Instructions
How to use this tracker:

1. Each day, rate your symptoms on a 1-6 scale in the "Today" tab. 1 = Not at all, 6 = Extreme impact.

2. Mark your menstrual bleeding flow each day to help track cycle phases.

3. Save your entries daily. The app stores data on your device.

4. Use the "Calendar" tab to see your overall symptom patterns across the month.

5. After tracking for at least 2 complete cycles, the "Analysis" tab will show C-PASS assessment results comparing premenstrual and postmenstrual symptom patterns. Three or more cycles increase assessment confidence.

6. Use the "Export Data" button to print a professional report for your clinician.

This app is a screening tool. Results should be reviewed with your healthcare provider.
About this build

Build: symcycle-v3-2026-05-19

Build date: 2026-04-30

Cache name: symcycle-v3-2026-05-19

Your data is stored locally on this device only. SymCycle does not send tracking entries to a server.

Symcycle
A product of JLilo Ventures, LLC
Copyright 2026 JLilo Ventures, LLC. All rights reserved. Unauthorized reproduction prohibited.
On phone, use Share or Copy to send or save this raw tracking report. Print / PDF works best on desktop.