Luna
Know your body. Own your data.
Most period apps sell your most intimate health data. Luna can't — it never holds a copy. No account. No cloud. No one watching.
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.
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.
On-Device by Default
Your history stays strictly on your physical phone out of the box. No automatic server uploads. If you want a safety copy, export an encrypted backup file and store it somewhere you control.
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.
No CGI, no Photoshop, no stock art. These are raw, unedited screenshots taken directly from a phone. Look at the real app, not a marketing concept.
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.
Luna gives you two ways to protect your history — choose what fits your life:
Device Transfer Mode: The easy safety copy for real life. Export an encrypted .lbk file, keep it somewhere you trust, and bring your history with you when you change phones, platforms, or operating systems.
Private Vault Mode: The locked-down archive for your most private data. Seal the backup with your 12-word recovery phrase so the file stays unreadable without your words.
Local Only: Your data stays strictly on this phone until you choose to export a manual safety copy.
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.
Speak your language. Match your mood.
Luna supports German, Spanish, Bengali, Dutch, and English out of the box. And because logging your cycle shouldn't hurt your eyes at 1 AM, you can switch between clean Light and Dark modes with custom themes that match your style.
What we don't have, we can't hand over
If an app stores your period history on their servers, they can be legally forced to hand it over to courts or prosecutors with a simple subpoena. Luna is designed to make this impossible. Because we require no accounts and store logs only on your device, we hold zero records. If we are subpoenaed, we have nothing to give. If you export a backup, you keep the file under your own control. Your history stays yours.
Read the Privacy Policy →The Subpoena-Proof Tracker: How Luna Protects What Others Sell
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 |
| Backup Control | Device Transfer & Private Vault (.lbk) | Forced Cloud Only | Forced Cloud Only | Forced Cloud Only |
| Data Selling Protection | 100% Protected (No Server) | FTC Settlement for Leaks | Shares with Partners | 2/10 Mozilla Rating (Data Shared) |
| Ad Profiling Protection | 100% Protected (No Trackers) | Vulnerable to Ad Retargeting | Integrated Ad SDKs | Integrated Analytics SDKs |
| Subpoena Protection | 100% Protected (Local/Key) | Vulnerable (Cloud Seizure) | Vulnerable (Cloud Seizure) | Vulnerable (Cloud Seizure) |
How to verify these claims:
- [1] Cloud Storage & Accounts: Verified via Flo's onboarding screens (requiring email/registration), Clue's account creation policy, and Stardust's signup requirements. All three store database records on remote cloud servers to manage user sessions.
- [2] Ad & Analytics Trackers: Confirmed via the official Apple App Store App Privacy declarations and Google Play Store safety labels. Flo lists data used to track you (device IDs, advertising data), Clue discloses tracking via Adjust and Google SDKs, and Stardust's manifest integrates third-party tools.
- [3] Flo FTC Case: The Federal Trade Commission finalized an order in June 2021 settling allegations that Flo Health shared users' private health information with third-party advertising companies. View the official FTC Press Release.
- [4] Subpoenas & Law Enforcement: Cloud-stored databases are subject to third-party subpoena laws. In 2022, Stardust's privacy policy stated it would comply with law enforcement even without a warrant (see Vice Investigation). Clue and Flo operate as central cloud-custodians under German and US jurisdiction.
- [5] Mozilla Privacy Audit (Stardust): Mozilla Foundation's Privacy Not Included review gave Stardust a 2/10 privacy rating, finding that sensitive health data, pregnancy status, and symptom logs are shared with third-party analytics (RudderStack) and advertising identifiers with Meta/Facebook by default without opt-out options. Read the Mozilla Foundation Stardust Privacy Review.
- [6] Verify Luna Locally: Turn on Airplane Mode — cycle predictions, logs, and exports function perfectly. You can run network auditing tools (like Charles Proxy or Proxyman) to confirm zero network requests are sent during regular cycle tracking.
Ready to track privately? Start free on Android.
Get Luna on Google PlayRead 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.
Start free. Upgrade when Luna becomes routine.
Core tracking stays free forever. Premium adds private sharing, discreet alerts, deeper planning, and portable exports. No ads. No data sold. Ever.
Luna Free
Private period tracking with the basics covered. No account, no ads, no pressure.
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Cycle, phase & fertile-window tracking Know what is coming without sending intimate data to a server.
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Symptom, mood & notes log Keep your private daily record on your own phone.
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Private reminders Period and cycle alerts without ads or behavioral tracking.
Luna Premium Annual
The full private planning toolkit for people who use Luna as part of their real routine.
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Share timing without exposing logs Private partner sharing shows phase context, not symptoms, moods, or notes.
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Hide sensitive notifications Discreet lock-screen alerts keep cycle details out of sight.
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Plan beyond the next month Extended trends and future calendar planning for trips, workouts, and appointments.
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Export everything when needed Doctor-ready PDF plus full CSV and JSON history export.
PDF Export Pass
For one clear report before a visit. One payment, no subscription.
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Doctor-ready PDF forever Unlock the PDF export button permanently with one payment.
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Keep core tracking free Useful when you need a clean summary but do not want Premium.
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Built for appointments Bring cycle dates, symptoms, and notes into one readable export.
Payments happen securely inside Luna through Google Play. Regional pricing may vary by country. Free tracking works without an account.
Frequently Asked Questions
Everything you need to know about Luna's privacy, features, and how it works.
1. Data Selling (Will brokers buy my records?)
- 100% Local: 100% safe. Your data never leaves your physical device.
- Device Transfer Mode: Built for occasional backups and phone moves. Keep the encrypted .lbk file somewhere only you control.
- Private Vault Mode: Built for maximum backup privacy. Your 12-word phrase becomes the vault door for the exported file.
2. Advertising Profiling (Will I get targeted baby ads?)
- 📱 Local, Device Transfer Mode, and 🔑 Private Vault Mode: Luna contains zero advertising trackers. No cycle information is shared with ad networks.
3. Subpoenas & Legal Access (Can courts force the release of my logs?)
- 100% Local: 100% safe. Luna has no servers and no user databases. If subpoenaed, we have nothing to hand over.
- Device Transfer Mode: A practical encrypted backup for restores and device changes. Luna still has no server-side cycle database to hand over.
- Private Vault Mode: The strongest backup option. Your exported file is locked on-device with your 12-word recovery phrase before you store or move it.
Your data. Your phone. Nobody else.
Free forever for core tracking. No account required.
Get Luna on Google PlayShape 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.
Join iOS Waitlist
Be the first to know when Luna launches on the Apple App Store.
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 →