Prime Period vs Full Moon Flow
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
Prime Period
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PRIME PERIOD: THE PRIVATE CYCLE TRACKER More private than a paper journal. Prime Period is a cycle tracker designed to provide a secure and straightforward way to understand your body. Keep your data exactly where it belongs: on your device. SECURE & ACCOUNT-FREE - No Sign-Up Required: Your data is stored locally on your device, no accounts or emails required. - Privacy-First: We don't collect your personal information. - On-Device Storage: Data is stored locally on your device, protected by your device's built-in security. - Optional transfer: Move data between devices with a private key; we never see the key. STRAIGHTFORWARD TRACKING - Cycle Insights: Log dates and view your monthly patterns. - Preparedness: Get clear estimates for your next period. - Daily Logging: Track flow, mood, and symptoms. - Fluid Experience: Fast, responsive, and reliable. THE PRIME PROMISE Health tracking should be helpful and, above all, private. With Prime Period, your personal information stays exactly where it belongs: under your control. MEDICAL DISCLAIMER Prime Period is an informational tool and is not intended for contraception or medical diagnosis. Please consult a healthcare professional for medical advice. Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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.
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Verdict
The clearest difference is in-app purchases: Full Moon Flow at none against Prime Period's 2. On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. Prime Period sells 2 in-app purchases, starting at $0.99 per month. Full Moon Flow asks for nothing beyond the download.
| Parameter | Prime Period | Full Moon Flow |
|---|---|---|
| Price | Free | Free |
| Update frequency | ā | Every 9 days |
| Ads | No | No |
| In-app purchases | Yes | No ā better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.6 | 16.4 ā better |
| Further details ā not scored | ||
| Size | 1 MB | 52 MB |
| Age rating | 4+ | 4+ |
| Developer | Figenblad | Daniel Delellis |
In-app purchases
Prime Period
- Premium - Monthly$0.991 Month
- Premium - Yearly$9.991 Year
Full Moon Flow
No in-app purchases








