01
Your everyday cycle
Log periods and flow, see your calendar and estimates, and choose Standard, Irregular, or Symptom-Only mode.
Free and Chan+
The free app is the real app.
I built the free version to stand on its own. Chan+ is there if you want deeper logs, BBT, widgets, and a few extra privacy controls.
Local-firstCycle records stay in the app
What is inside
I kept the useful parts close.
02
How you feel
Keep moods, notes, energy, basic symptoms, and multiple entries together without losing the human part of tracking.
03
Deeper daily context
Chan+ adds symptom severity, LH test results, cervical-fluid logging, and the Advanced Daily Log.
04
BBT patterns
Chan+ includes BBT logging, history, a graph, and a visualizer so temperature patterns are easier to notice.
05
Patterns over time
Monthly and yearly cycle views, a mood-year visualizer, and the period-late helper make your history useful.
06
Privacy controls
PIN protection is free. Chan+ adds biometric unlock and an app-switcher privacy screen.
07
No lock-in
Import compatible data and export your full record as CSV in the free app whenever you choose.
08
Made to feel at home
All six languages, light and dark themes, ordinary cycle notifications, and product timers are included for everyone.
Every new customer
15 days to try it. One payment if you keep it.
I made Chan+ a one-time purchase, not a subscription. Your local App Store or Google Play listing shows the current price for your country or region.
Advanced Daily Log · BBT · Widgets · Biometric unlock · Privacy screen · Food suggestions
Free vs Chan+
Everything, line by line.
Free is not a preview. Chan+ simply gives you more ways to log and protect the details.
| Capability | Free | Chan+ |
|---|---|---|
| Period and flow logging, calendar, and cycle estimates | Included | Included |
| Basic symptom logging from Calendar | Included | Included |
| Advanced Daily Log: symptom severity, LH tests, and cervical fluid | Not included | Included |
| Mood tracking, notes, and multiple entries | Included | Included |
| Energy tracking | Included | Included |
| Period-product timers and reminders | Included | Included |
| BBT logging, history, and graph | Not included | Included |
| Food and nutrition suggestions | Not included | Included |
| Food-suggestion notifications | Not included | Included |
| Home-screen cycle widgets | Locked | Included |
| PIN app lock | Included | Included |
| Biometric unlock | Not included | Included |
| App-switcher privacy screen | Not included | Included |
| Import | Included | Included |
| Full CSV export | Included | Included |
| Standard, Irregular, and Symptom-Only modes | Included | Included |
| Period-late helper with saved context and history | Included | Included |
| Monthly and yearly cycle visualizers | Included | Included |
| Mood year visualizer | Included | Included |
| BBT visualizer | Not included | Included |
| English, Spanish, French, German, Portuguese, and Tagalog | All six | All six |
| Light and dark themes, plus ordinary cycle notifications | Included | Included |
How predictions work
Helpful estimates, not certainty.
Petal Chan calculates cycle and fertility estimates locally from the history you record. BBT, LH tests, and cervical-fluid logs can add context, but none of them makes an ovulation or fertility prediction certain.
Medical use
I built a tracker, not a medical device.
Petal Chan does not provide medical advice and is not intended to diagnose a condition. Do not rely on it as contraception, to determine “safe days,” or as guaranteed conception guidance.
Want the privacy details?
I explain where records live, what app lock protects, and what happens when you export.
Read how privacy works