Period or Not vs Full Moon Flow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Period or Not
This private period tracker stores all your cycle data locally on your device, with no account or server required. It learns your unique cycle patterns to provide accurate predictions and offers optional encrypted backups to your own cloud storage.
- Local data storage
- No account required
- Learns personal cycle patterns
- Predicts period and ovulation days
- Optional encrypted iCloud backup
- Data export to file
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Your cycle data belongs to you. Not to us, not to advertisers, not to anyone. Period or Not is a period tracker with no account and no server of ours. Your period history, your symptoms and your settings are written to your phone's own storage and stay there. Nothing reaches us, because there is nowhere for it to go. Want a backup? Export a file and keep it yourself, or switch on an encrypted copy in your own iCloud. Both are off until you choose them, and neither one passes through us. How it works • Tap a day to log your period. Hold it to add how you felt. • Log the first day and the rest fill in for you. • See what is coming: predicted period days, ovulation, and where you are in your cycle right now. • Bring the history you already have with a read-only import from Apple Health. • Export everything to a file you keep, whenever you want. It learns your cycle, not the average one Most trackers assume 28 days. This one takes the median of your own last six to twelve cycles, so a single unusual month does not drag your prediction around. It learns how long your period actually lasts the same way, and only from the days you tapped yourself, never from the days it filled in for you. What you get • A calendar you can scroll through, forwards and backwards, forever • Symptom and mood tags, plus any tag you want to write yourself • A Stats tab: cycle day, current phase, your averages, your most-logged symptoms • Reminders one to seven days before your period, in the morning, afternoon or evening, scheduled on your phone rather than sent from a server • Optional sync to your Apple or Google calendar, with your own calendar name and your own event titles • Light, Dark or System appearance • Backup and restore through a file you control Everything is free There is no subscription, no in-app purchase and no locked feature. Export, import, Apple Health, statistics, reminders: all of it, for everyone. Why we are different We went fully local. There are no servers and no database of your cycles. Other apps say "secure cloud storage" and mean their storage, on their machines. The only cloud here is your own iCloud, switched off until you turn it on, and encrypted with a key that never leaves your devices. Nothing leaves your phone unless you choose it, and none of it comes to us. • No analytics, no behavioural tracking, no third-party SDKs • No data selling, because we do not have your data • No account to create and no email to hand over Built by a woman, for women. This is not a VC-backed data business. It is an indie app made by someone who uses it and cares about who else can read it. Period apps have made headlines for privacy failures. We built the version that cannot fail that way. Your health data is yours. Period. ---
Full Moon Flow
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Your cycle, your data, your device. Full Moon Flow is a simple, private period tracker that keeps all your data on your device. No accounts, no cloud sync, no tracking. Just open the app, tap a day, and log your flow. What it does: • Log your daily flow intensity (spotting, light, medium, heavy) on a clean monthly calendar • Log your mood if desired, track patterns over time to see how your cycle affects your mood. • See your cycle history at a glance- period duration and cycle length for each past cycle • View averages and trends- know your typical cycle length and how it's changing over time • Get a gentle estimate of when your next period might start, based on your own history • Export your data as a CSV file anytime. It's your data, you control it. What it doesn't do: • No accounts to create • No data sent to any server ever • No ads, no analytics, no tracking • No fertility or ovulation predictions • No notifications (yet) Privacy first. Full Moon Flow was designed from the ground up to keep your menstrual health data completely private. Everything is stored locally on your device in an encrypted database. Nothing is transmitted over the internet. When you delete the app, your data is gone, because it was never anywhere else. Simple by design. No cluttered dashboards, no gamification, no social features. Just a calm, clean interface that helps you understand your cycle without the noise.
Screenshots
Verdict
The clearest difference is update cadence: Full Moon Flow at every 9 days against Period or Not's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Period or Not ships an update every 3 weeks, Full Moon Flow every 9 days. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.
| Parameter | Period or Not | Full Moon Flow |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (3 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 3 weeks | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.4 | 16.4 |
| Further details — not scored | ||
| Size | 44 MB | 52 MB |
| Age rating | 9+ | 4+ |
| Developer | Antonija Pek | Daniel Delellis |
In-app purchases
Period or Not
No in-app purchases
Full Moon Flow
No in-app purchases









