Luna is the period tracker that actually respects your privacy. With 99% accurate predictions powered by on-device AI, your intimate health data never leaves your phone. No cloud, no sharing, no ads. Track periods, ovulation & symptoms with complete privacy.
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Maker
๐
Hey Product Hunt! ๐
I'm Pedro, the maker of Luna. I built this after my wife asked me a simple question: "Why does my period app need internet to tell me when my next period is coming?"
That got me thinking... and worried. Period tracking apps collect incredibly intimate data - cycles, symptoms, sexual activity, pregnancy attempts. Recent events (Roe v. Wade, data breaches) have shown this data can be weaponized.
So I built Luna with one core principle: YOUR DATA NEVER LEAVES YOUR PHONE.
๐ How Luna is different:
- 100% on-device processing (using Core ML)
- Works perfectly in airplane mode
- No account required
- No cloud, no servers, no analytics
- Optional encrypted backup (you control the keys)
๐ But still accurate:
- 99% prediction accuracy after 3 cycles
- Symptom pattern recognition
- Fertility window calculations
- All using the same scientific methods as other apps
I'd love to hear your thoughts on privacy in health apps. What features would you want in a truly private period tracker?
P.S. - For today only, everyone who upvotes gets 50% off lifetime premium! Just DM me your email ๐
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How do you make money if you don't collect data?
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Maker
@guilherme_mamareย Great question Guilherme! We use a simple, honest subscription model:
- Free: Basic tracking, predictions & calendar
- Premium: $4.99/mo or $29.99/year - advanced analytics, extended predictions, PDF exports
- Lifetime: $99 one-time purchase
No ads, no data selling, just software you pay for. We believe privacy shouldn't be a luxury feature!
The old model of "free app = selling your data" needs to end, especially for health apps ๐
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Is there an Android version?
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Maker
@joana_pessoaย Hi Joana! Yes, Android version is coming in January 2025! ๐
We're taking extra time to ensure the same privacy standards using Android's Private Compute Core.
How do you make money if you don't collect data?
@guilherme_mamareย Great question Guilherme! We use a simple, honest subscription model:
- Free: Basic tracking, predictions & calendar
- Premium: $4.99/mo or $29.99/year - advanced analytics, extended predictions, PDF exports
- Lifetime: $99 one-time purchase
No ads, no data selling, just software you pay for. We believe privacy shouldn't be a luxury feature!
The old model of "free app = selling your data" needs to end, especially for health apps ๐
Is there an Android version?
@joana_pessoaย Hi Joana! Yes, Android version is coming in January 2025! ๐
We're taking extra time to ensure the same privacy standards using Android's Private Compute Core.
Thanks for your interest! ๐
Can you sync between devices?
@agendoorย Yes! But privacy-first ๐
Two options:
1. iCloud Sync: End-to-end encrypted using your iCloud Keychain
2. Local WiFi Sync: Direct device-to-device, no internet needed
Both methods mean we NEVER see your data - the encryption keys stay with you. Think Signal-level encryption but for period tracking!
Your data, your control ๐
What happens if I lose my phone?
@pedro_santos30ย Hi Pedro! (great name btw ๐)
If you enabled encrypted backup:
- iCloud backup restores everything automatically
- Only YOU have the encryption keys - we can't access even if we wanted
If you didn't enable backup:
- Data is lost (that's the trade-off for true privacy)
- But Luna learns your patterns quickly when you start fresh!
We recommend enabling encrypted backup for peace of mind - best of both worlds! ๐
Swytchcode
Congrats on the launch!
@chilaraiย thanks!