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Stardust vs Mori
The short answer: Stardust mixes cycle tracking with astrology and horoscopes, requires an account (phone number), and monetizes with a subscription (~US$6.99/month or ~US$29.99/year). Mori is the opposite approach: plain cycle tracking, no account, no subscription, and records that never leave your phone unless you opt into encrypted sync.
Side by side
| Stardust | Mori | |
|---|---|---|
| Price | Free tier; subscription ≈ US$6.99/mo or US$29.99/yr for full access | All core features free forever; optional encrypted sync US$3.99 once |
| Account | Required — sign-up includes a phone number | None. An email is only needed if you opt into cloud sync |
| Content model | Cycle tracking blended with astrology, horoscopes and moon-phase framing | Plain cycle tracking — estimates with basis and confidence, no content feed |
| Where records live | Stardust's servers, tied to your account | On your phone by default; optional sync is encrypted on-device before upload |
| Data-sharing record | In July 2026, Mozilla researchers reported Stardust shared users' health data with an analytics firm despite its "your data is private" marketing (TechCrunch / BBC coverage) | No ads, no analytics SDKs in the app, no third-party sharing; privacy policy states records stay local without sync |
| Offline use | Account-based app; assumes connectivity for sign-in and sync | Fully functional without network |
| Platforms | iOS and Android | Android today (signed APK); iOS in progress |
Where they genuinely differ
Privacy promises vs privacy architecture
Stardust markets privacy loudly ("your data is private, period") and was early to promise end-to-end encryption — yet Mozilla's July 2026 research found health data flowing to an analytics firm. Mori's claim is simpler and more checkable: no account exists, no analytics SDKs ship in the app, and records stay on the phone. There's less to take on faith.
What the app is about
Stardust wraps tracking in astrology — lunar phases, horoscope-adjacent insights. That framing is either a feature or noise depending on you. Mori treats the cycle as a factual record: deterministic estimates, a confidence label, and nothing else competing for attention.
Identity requirements
Stardust asks for a phone number to sign up — a particularly sensitive identifier to attach to health data. Mori has no sign-up flow at all; even its optional sync only needs an email, and records are encrypted before they leave.
Which should you choose?
- Choose Stardust if the astrology angle genuinely appeals to you and you're comfortable with an account, a subscription, and reviewing its current privacy disclosures after the 2026 Mozilla findings.
- Choose Mori if you want tracking without identity (no account, no phone number), no subscription, full offline use, and estimates presented as ranges with confidence rather than certainties. Android only, for now.
FAQ
Is Stardust a private period tracker?
Stardust advertises strong privacy and was early to promise end-to-end encryption, but in July 2026 Mozilla researchers reported the app shared users' health data with an analytics firm (per TechCrunch/BBC coverage). Mori's privacy is architectural: no account, no analytics SDKs, records stay on the phone unless encrypted sync is enabled.
How much does Stardust cost?
Stardust offers a free tier plus paid subscription plans listed on its App Store page (roughly US$6.99/month or US$29.99/year). Mori's core features are free forever; the only paid option is encrypted cloud sync at US$3.99 once.
Does Mori include astrology or horoscope features?
No. Mori is deliberately plain cycle tracking: mark days on a calendar, get a date-range estimate with its basis and confidence, export or delete anytime. No horoscopes, no content feed, no account.