Luna
Know your body. Own your data.
Luna tracks your cycle, predicts your phases, and plans your life — entirely on your phone. No account. No cloud. No one watching.
No Account. Ever.
Open the app and start tracking. No email, no password, no social login — nothing. Luna doesn't know who you are, and it never will.
Lives Only on Your Phone
Your cycle logs, symptoms, and notes stay on your device. They never leave it. No server, no cloud, no one to subpoena.
Zero Ads. Zero Trackers.
No banners, no video ads, no analytics SDKs watching what you tap. Luna earns only from users who choose to pay. Nothing else.
Take a look inside.
The actual app, running on a real phone. Every screen you see is real.
Plan Your Life Around Your Body
The home screen shows your cycle ring, today's phase, and a day-by-day view of your next 30, 60, 90, 180, or 365 days — so you can plan trips, schedule important events, and know when to rest. Works in all six modes: Standard, PCOS, TTC, Perimenopause, Pregnancy, and Contraception. The TTC badge shown here is just one option — switch modes anytime, nothing resets.
Escape Without Losing Your Past
Leaving Flo, Clue, or Stardust shouldn't cost you years of cycle history. Just upload screenshots of their calendar view — Luna reads the dates privately on-device using local OCR, imports your history, and flags anything uncertain for you to verify.
One App for Every Chapter of Your Life
Trying to conceive, managing PCOS, approaching perimenopause, or just tracking for peace of mind — switch between six purpose-built modes at any time. Each one reshapes how Luna reads your body, entirely locally, with nothing uploaded.
Share the Timing. Not the Details.
Private Partner Sharing lets one trusted person see your cycle timing via QR code — zero account creation, zero cloud upload. Your private notes, symptoms, and mood logs stay completely off the share. Use Instant QR when you're together, or PIN-locked QR to send safely over messages.
A Privacy Policy You Can Actually Read
Luna's built-in Privacy Policy fits on one screen: no account required, cycle history stays on this device, no ads selling your health data. It's not a 40-page legal document designed to hide something — it's three bullet points because there's nothing to hide.
Your Backup. Your Keys. Your Call.
Backup & Restore creates an encrypted .lbk file that only you control — save it to iCloud, Google Drive, or email it to yourself. Luna runs 100% offline, so if you delete the app, your data goes with it unless you back up. This screen says that, loudly.
Stop Guessing. Start Seeing Patterns.
See symptom and mood patterns clearly enough to plan around the hard days instead of guessing. Luna highlights your top recurring symptoms and tracks mood trends over 90 days, completely on your device.
Your Calendar. Clear & Simple.
Plan your life, trips, and events around your rhythm. Luna's calendar gives you a clear, day-by-day view of your cycles, predicted periods, and fertile windows with standard or custom symbols — completely offline.
Everything You Need. Nothing You Don't.
Six tracking modes. Partner sharing. History import. Discreet widgets. All of it runs on your phone — no internet required, no account needed.
Adaptive Tracking Modes
Choose between Standard Mode, PCOS Mode (longer/irregular cycles), Perimenopause Mode, Contraception Mode (fertility hidden), Pregnancy Mode (countdown paused), or TTC Mode (conception focus). Switch any time without losing history.
Switch From Flo, Clue, or Stardust — Keep Every Log
Leaving your old app doesn't mean losing 3 years of history. Just upload screenshots of your calendar and Luna reads the dates privately on your phone — no upload, no account, no data sent anywhere.
Private Partner Sharing
Share your current cycle phase with a partner 100% offline via encrypted QR code sync. Your partner only sees phase names and helpful tips — your symptoms, moods, and notes remain private.
Discreet Notifications
Keep your cycle confidential in public. If enabled, lock-screen notifications show generic reminders like 'Luna check-in' or 'Daily summary ready', never revealing sensitive period or fertility details.
Stealth Moon Widgets
Keep track of your cycle day discreetly. The home widget cycles between cycle day countdowns and the current moon phase 🌔. To onlookers, it looks like a stargazing utility, protecting your reproductive privacy in public.
Encrypted Backup Vault
Your data stays on your phone, but you are in complete control of backups. Export an AES-256 encrypted file protected by a custom password. Store it anywhere you like to transfer history.
Luna can't.
Major trackers like Flo, Clue, and Stardust require accounts and store your history on their servers, exposing your intimate logs to subpoenas under the Third-Party Doctrine. Many even leak data to advertising networks — leading to Flo's massive $59.5M privacy settlements and Stardust's Mixpanel phone number leak. Luna rejects this entirely. All cycle data lives only on your phone, calculations run locally, and reminders are scheduled on-device. With zero server databases, there is nothing to sell and nothing to hand over.
Read the Privacy Policy →A Transparent Comparison
Side by side. Every claim, verifiable.
| Feature & Privacy | Luna | Flo | Clue | Stardust |
|---|---|---|---|---|
| Account Required | No Account | Yes (Email/Social) | Yes (Email/Social) | Yes (Phone/Email) |
| Where is data stored? | 100% On-Device | Cloud Servers | Cloud Servers | Cloud Servers |
| Ad & Analytics SDKs | Zero Trackers | Adjust, Firebase, etc. | Braze, Google, etc. | Mixpanel, Firebase, etc. |
| Offline Usage | Fully Functional | Limited Access | Limited Access | Limited Access |
| Partner Sharing Mode | Encrypted QR (Offline) | Cloud-Synced Profiles | Cloud-Synced Profiles | Cloud-Synced Profiles |
| Data Encryption Key | User-Owned (AES-256) | Server-Managed | Server-Managed | Server-Managed |
I built Luna because the person I love deserved to feel safe. When my partner and I read about period apps selling users' most intimate health logs to advertising giants, it felt like a deep violation of trust. We searched for a tracker that kept everything strictly on-device, but every option forced us to sign up or upload to the cloud. So, I built it myself. Later, we wanted a way to stay in sync so I could support her on the hard days—without letting some corporate server spy on our intimacy. That’s why I added offline partner sharing. I started this to protect her, and now I’m sharing it to help protect you, too.
Read What Led to Luna
Independent investigations into how period apps handle your data — and why most of them shouldn't be trusted with it.
Data Leaks Audit
What data does every major period app send? A technical audit of Flo, Clue, Natural Cycles, and Stardust.
Post-Roe Privacy
How subpoenas target reproductive logs under the Third-Party Doctrine, and how to protect yours.
Local Architecture
A developer's perspective on shifting to local-only SQLite databases and client-side prediction engines.
Does It Exist?
Finding a cycle tracker with zero server endpoints, zero advertising SDKs, and zero cloud backups.
Free to track. Pay only for the extras that matter to you.
Core cycle tracking — period dates, fertile window, ovulation, symptoms, moods — is free forever. Premium unlocks partner sharing, pattern insights, and export tools. No ads. No data sold. Ever.
Luna Free
Track your cycle, log symptoms, and get reminders — private and free, forever.
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Cycle & Phase Tracking Know when your period is coming, where you are in your cycle, and when your fertile window opens.
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Deep Symptom Logs Track symptoms and moods daily with a private diary section.
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Period & Cycle Reminders Configurable, private push alerts for incoming cycles.
PDF Export Pass
One report. No subscription. Built for the month you need a clean doctor-ready PDF and nothing else.
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Doctor-Ready PDF Export One payment. PDF export unlocked permanently — no subscription needed.
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Keep Everything Else Free Perfect if you only need the report and do not want a recurring subscription.
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The Doctor Month Option Useful before a gynecologist visit, fertility consult, or personal health review.
Luna Premium Monthly
Pattern insights, partner sharing, and full export tools — cancel any month.
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Deeper Pattern Readouts See symptom and mood patterns clearly enough to plan around the hard days instead of guessing.
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Share Your Rhythm Offline, serverless timing sharing with one trusted person. Shared phases, zero shared logs.
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PDF + Full History Export Includes doctor-ready PDF export plus unlimited CSV and JSON history export.
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Premium Themes Unlock the full accent palette and make Luna feel more personal without ever adding ads.
Luna Premium Annual
The full Premium experience for people who know Luna is part of their routine and want the best yearly value.
Only ~$2.50/month · save about 50% vs monthly
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Deeper Pattern Readouts See symptom and mood patterns clearly enough to plan around the hard days instead of guessing.
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Share Your Rhythm Offline, serverless timing sharing with one trusted person. Shared phases, zero shared logs.
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PDF + Full History Export Includes doctor-ready PDF export plus unlimited CSV and JSON history export.
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Premium Themes Unlock the full accent palette and keep Luna feeling personal all year.
Frequently Asked Questions
Everything you need to know about Luna's privacy, features, and how it works.
Shape the Future of Luna
Luna is built for you, and we co-create it with our users. Whether you have a feature suggestion, spotted a bug, or need help, reach out directly.
Report a Bug
Help us clean the logs. Send a details screen description or log behavior.
Send Bug Details →Suggest a Feature
Want a specific widget, custom sync mode, or tracker option? Tell us.
Submit Feature Idea →Get Support
Having issues with local backup restoration or imports? We're here to help.
Contact Creator →