SymptomLog vs Full Moon Flow
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
SymptomLog
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Log every symptom, flare, medication, and trigger in under 5 seconds ā no setup overwhelm, no freezing, no blank screen when you feel worst. Built for lupus, fibromyalgia, CFS, POTS, endometriosis, and all autoimmune conditions. Analytics show your trigger patterns and help you prepare for appointments. Track sleep alongside symptoms. Export a full health timeline to share with your doctor. Not just a diary ā an analytical engine that works on your worst days. Terms of Use: https://docs.google.com/document/d/e/2PACX-1vQdEtKDnCjuEDWelsB_wM-TjZAkXYh9ySPqfApocJcf4VjOaZX7NLnHqF0K46oGEhyfIsls3yvEDiPN/pub
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 SymptomLog's 3. SymptomLog's advantage is update cadence (daily vs every 9 days). 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. SymptomLog sells 3 in-app purchases, starting at $2.99 per month. Full Moon Flow asks for nothing beyond the download.
SymptomLog ships an update daily, Full Moon Flow every 9 days. The most recent releases landed on October 6, 2026 and October 8, 2026 respectively.
| Parameter | SymptomLog | Full Moon Flow |
|---|---|---|
| Price | Free | Free |
| Update frequency | Daily ā better | Every 9 days |
| Ads | No | No |
| In-app purchases | Yes | No ā better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 16.4 ā better |
| Further details ā not scored | ||
| Size | 6 MB | 52 MB |
| Age rating | 4+ | 4+ |
| Developer | Sajith Lal m k | Daniel Delellis |
In-app purchases
SymptomLog
- SymptomLog Monthly7 Days trial$2.991 Month
- SymptomLog Annual7 Days trial$14.991 Year
- SymptomLog Lifetime$24.99
Full Moon Flow
No in-app purchases









