Choosing a cycle tracker is personal. You might want somewhere to record your period and get on with your day. You might want pregnancy content, a way to include your partner, or an app whose personality makes daily check-ins more appealing.
lilCycles supports period, mood and strength-session logging, with cycle predictions and phase guidance.[1] Stardust advertises period and symptom tracking, pregnancy features, partner and friend sharing, and lunar themes.[2] Those are different reasons to choose an app, rather than a reason to declare one the winner for everyone.
This comparison is published by lilMONSTER, the maker of lilCycles.[1] This is our comparison, not an independent review. It checks the supplied lilCycles product facts and Stardust's public sources rechecked from publisher sources on 19 October 2026. We have not performed a hands-on Stardust test. Features below are documented capabilities, not a claim that both apps include them in equivalent subscription tiers.
The short answer
Choose lilCycles if you want an account-free tracker with on-device data, no cloud sync, no ads and no analytics SDK.[1] Its Apple Health connection is write-only, and optional AI summaries can run on-device where supported or on your own local model server.[1]
Stardust is the better fit to explore if you want an advertised week-by-week pregnancy experience or partner and friend sharing.[2] Its moon calendar, zodiac content and lunar symbolism may also appeal if you enjoy that style.[2] Treat those themes as a preference, not evidence of medical benefit.
lilCycles and Stardust at a glance
This table compares the documented iOS experience and data practices. A policy describes what a provider says it does; it is not an independent security audit.
| What matters to you | lilCycles | Stardust |
|---|---|---|
| Tracking focus | Period, mood and strength-session logs; predictions and phase guidance.[1] | Period and symptom tracking, pregnancy features and lunar-themed content.[2] |
| Account model | No account.[1] | Policy describes account registration. Whether every tracking flow requires signup was not verified.[3] |
| Data storage | Data stays on-device; no cloud sync.[1] | Policy describes server-hosting processors and separates contact credentials from health data.[3] |
| Ads and analytics | No ads, no analytics SDK and no tracking.[1] | Policy describes analytics and consent-dependent advertising measurement; says health data is not used for digital advertising.[3] |
| Apple Health | Write-only; never reads Health data.[1] | May import activity, sleep, temperature and menstruation data with permission.[3] |
| AI | Optional summaries using supported on-device AI or a user-owned local model server.[1] | AI is advertised; the reviewed listing does not identify the model or inference host.[2] |
What you want from daily tracking
A personal log with room for strength sessions
lilCycles brings period, mood and strength-session logging into the same app, alongside predictions and phase guidance.[1] If those are the things you want to record, that is a concrete reason to consider it. You do not need to choose an app on the strength of features you will never use.
lilCycles is available on iOS and Apple Watch.[1] It also exports to a dedicated calendar.[1] That is calendar export, not a promise of live partner sharing or cloud sync.
Pregnancy content and shared tracking
Stardust's iPhone listing advertises week-by-week pregnancy tracking, weekly baby-growth views and pregnancy-related content.[2] It also invites users to include partners or close friends in cycle, trying-to-conceive or pregnancy tracking.[2]
If those are your priorities, Stardust deserves a place on your shortlist. Our verified lilCycles scope here is period, mood and strength-session logging, predictions and wellness guidance.[1] We are not presenting that scope as equivalent to Stardust's advertised pregnancy experience.[2]
The same applies to personality. Stardust explicitly includes moon and zodiac themes.[2] You may enjoy that approach, or prefer to choose your tracker around logging and data controls. Neither preference needs a sales pitch.
Privacy: compare the actual data flow
What lilCycles keeps local
lilCycles requires no account, has no cloud sync and carries the App Store privacy label "Data Not Collected."[1] It includes an encrypted backup/export archive and a "Delete all local data" control.[1]
There are boundaries worth knowing. Deleting local lilCycles data does not delete samples already written to Apple Health.[1] An exported archive is also something you need to store thoughtfully. Without app cloud sync, decide how you want to manage your backups rather than assuming an account will recover your history.
What Stardust discloses
Stardust's general privacy policy, updated 8 May 2026, says it stores contact credentials separately and associates health data with an identifier instead.[3] Its health-data notice, dated 21 October 2025, describes access by processors such as server-hosting and support providers, plus user-directed integrations and sharing.[3] That is a different architecture from keeping app data solely on-device.
Its US App Store label declares purchases, identifiers and usage data as potentially used for tracking across other companies' apps and websites.[2] Apple presents these as developer disclosures, not independently verified findings.[2]
There is an important qualification: Stardust's policy says it does not use or disclose health data to serve digital advertising.[3] Its advertising-measurement disclosures should not be rewritten as "Stardust sells your period history." Nor does a tracking disclosure establish that you will see banner ads inside the app.
For this comparison, the useful distinction is local storage without an analytics SDK versus the server and analytics processing Stardust documents.[1][3] It is not a claim that one app is unhackable or that the other is unlawful.
AI and Apple Health are separate choices
lilCycles works fully without AI.[1] If you enable summaries, the supported routes are on-device Apple Intelligence where available or your own local model server, such as Ollama, LM Studio or llama.cpp.[1] The payload is redacted and previewed before sending.[1] A server you run is still a separate destination from your phone; "local model" should not be read as "always processed on this device."
Stardust's listing advertises AI but does not specify its model or inference location.[2] We cannot make an evidence-backed comparison of model quality or prompt retention from that listing.
Apple Health is a clearer documented difference. lilCycles writes but never reads Health data.[1] Stardust's policy describes permission-based imports from HealthKit, including activity, sleep, temperature and menstruation data.[3] If you want those inputs brought into your tracker, Stardust's documented integration is more relevant to that goal.[3]
Subscriptions without a misleading price comparison
lilCycles Plus offers weekly, monthly and yearly subscriptions; the yearly option has a seven-day free trial.[1] Stardust's US listing is free to download with in-app purchases.[2]
We are not quoting prices or calling either app cheaper. Check your storefront and the offer shown to you, including the billing period, renewal terms and features you need. A free download is not a promise that every advertised feature is free.
Who should pick which
- Pick lilCycles if no account, no app cloud sync and no analytics SDK are priorities, and its logging scope matches your needs.[1]
- Explore Stardust if you want its advertised pregnancy timeline, partner or friend sharing, or lunar-themed experience.[2]
- Keep Stardust if those features already meet your needs. Switching is worthwhile when it solves a specific problem, not simply because another app exists.
FAQ
Can either app be used as contraception?
No. lilCycles is an 18+ wellness app, not contraception or medical advice.[1] Stardust's listing also says it must not be used as birth control and does not replace professional medical advice, diagnosis or treatment.[2]
Does lilCycles require an account or AI?
Neither. lilCycles has no account and works fully without AI.[1] Optional summaries are a separate choice, not a requirement for using the app.[1]
Which app should I consider for pregnancy tracking?
Stardust explicitly advertises a week-by-week pregnancy mode.[2] That makes it the more relevant option to explore for that particular need; this is not a claim about clinical outcomes.
Can these apps read my Apple Health data?
lilCycles never reads Health data; its integration is write-only.[1] Stardust's policy says it may import specified HealthKit data when you connect it and give permission.[3]
Can I transfer my history between them?
Stardust's FAQ describes importing screenshots during onboarding and deleting those screenshots from its servers after transfer.[4] A direct Stardust-to-lilCycles migration route was not verified for this article. lilCycles supports encrypted backup/export archives, but that does not establish compatibility with another app's export.[1]
Sources
Sources were rechecked from publisher sources on 19 October 2026. Source 1 is our maker-published product fact sheet, not an independent review. Stardust's documented statements were not tested in an installed app.
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