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All comparisons

Soso vs. Clue

Soso starts before her first period. Clue tracks birth control, trying to conceive and pregnancy.

Soso needs no account, keeps her cycle data off our servers and is rated 9+. Clue is a respected, science-led tracker from Germany that logs birth control and has modes for trying to conceive, pregnancy and perimenopause. It needs an account, does not allow under-13s in the US and asks under-16s for a parent’s permission.

Reviewed Oct 8, 2026

Soso is best for

A girl before or just after her first period who needs a simple, private start made for her age, with no account to create.

Clue is best for

Older teens and adults who want detailed analysis, 200+ things to track, wearables, and modes for trying to conceive, pregnancy and perimenopause.

Our verdict

For a girl getting ready for her first period, choose Soso: no account, no adult modes, and an experience that starts before her period does. When she is older and wants more analysis, Clue is a strong next step.

Side-by-side comparison

The criteria that matter most for early cycles.

Made for
Soso:Tweens before and after their first period, and their parents. Rated 9+ on the App Store.
Clue:In the US, under-13s cannot use it. Under-16s need a parent’s permission and help with privacy settings, and paid features are for 18+ unless a parent consents.
Before the first period
Soso:A whole experience for girls who have not had their first period yet. She gets an estimate of when it may arrive, and the window narrows as she logs the signs of puberty. It is an estimate, not a date: a first period can come earlier or later.
Clue:No teen mode and no estimate of a first period. Its modes start once periods do.
Puberty body changes
Soso:She follows her breast and pubic hair development by picking, in private, the closest of a set of illustrated stages, and logs her height each month.
Clue:No puberty stages.
Privacy
Soso:App Store label: no data used to track her and nothing linked to her identity. Her cycle data is never sent to Soso’s servers.
Clue:Based in Germany and covered by EU privacy law. Its App Store label still lists identifiers that may be used to track you across other companies’ apps, and health data linked to your identity.
Account and backup
Soso:No account to create. Optional backup and sync between her devices through your own iCloud or Google Drive, never through Soso’s servers.
Clue:Required. Clue’s terms say you need an account to use it, and the no-account mode is closed to new users.
Ads inside the app
Soso:No ads.
Clue:No ads today, though its terms reserve the right to show them.
Intimacy, fertility and pregnancy
Soso:None. No intimacy log, no fertility window, no pregnancy mode.
Clue:Logs intimacy, plus modes for trying to conceive, pregnancy and perimenopause. Its App Store listing declares infrequent mature content.
Cycle tracking
Soso:Period, flow, spotting, discharge, mood and symptoms, in a calendar made for the first cycles.
Clue:200+ things to track, predictions and pattern analysis.
Devices
Soso:iPhone, iPad, Android and Apple Watch, with Siri.
Clue:iPhone, Android and wearable integrations.
Learning
Soso:Puberty and first periods explained for her age, with a quiz a day. The sources behind our health information are public on our Medical Sources page.
Clue:400+ articles written with scientists and clinicians.

What matters for her

Clue is not for under-13s in the US

Clue says US users under 13 cannot use the app, and that users under 16 need a parent or guardian’s permission and help with privacy settings. Many girls get their first period before 13, and the age varies a lot. Soso is rated 9+ and was made for exactly those years.

Soso starts before the first period

Clue has no teen mode and no first-period estimate. Soso gives a girl who has not had her first period an estimate of when it may arrive, then narrows the window as she follows the signs of puberty: illustrated stages for breast and pubic hair development, and her height each month.

No account versus a required one

Clue requires an account, and its App Store label lists identifiers that may be used to track you. Soso has no account at all, declares no tracking, and her cycle data is never sent to our servers.

Where Clue is better

Clue goes much deeper: 200+ things to track, 400+ science-led articles, wearable integrations and modes for every stage of adult life. For an older teen or adult who wants that depth, Clue is excellent.

Frequently asked questions

Can someone under 13 use Clue?

In the United States, no: Clue says users under 13 cannot use the app. Clue also says users under 16 need a parent or guardian’s permission and help with privacy settings, and its terms set 18 as the age for paid features unless a parent consents. Rules can vary by country.

Does Clue need an account?

Yes. Clue’s terms say you need to create an account to use it, and the old no-account mode is no longer available to new users. Soso has no account at all.

Does Clue have ads?

Not today, but its terms reserve the right to show ads in the app. Soso has no ads.

Does Clue have adult content?

Clue’s App Store listing declares infrequent mature content, and the app has modes for trying to conceive and pregnancy. Soso has none of these.

Does Clue work before the first period?

No. Clue has no teen mode and no first-period estimate. Soso is built for exactly that stage.

Is Clue good for privacy?

Clue is based in Germany and follows EU privacy law, which is a real strength. Its App Store label still lists identifiers that may be used to track you across other companies’ apps, and it links health data to your identity. Soso declares neither.

Is there a period app for girls who haven’t had their first period?

Yes, Soso. She answers a few questions and gets an estimate of when her first period may arrive. With the First Period Prediction Pack she follows the signs of puberty, like breast and pubic hair development and her height each month, and the window narrows as she logs more. It is an estimate, not a date.

What should she use when she is older?

When she wants detailed analysis or to track fertility, pregnancy or perimenopause, Clue is a strong next step. Soso is for the first years.

Start the first cycle without drama

A gentle, educational and ad-free space to learn and track at your own pace.

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Sources and transparency

Each source says what was checked and when it was consulted.

  • Soso privacy policy

    There is no Soso account, and cycle data is stored on the device and never sent to Soso’s servers. Backup is optional and goes to the user’s own iCloud or Google Drive.

    Accessed Oct 8, 2026

  • Soso on the App Store

    Rated 9+, with no advertising. The privacy label declares no data used to track you and no data linked to you. Describes the first-period estimate and the First Period Prediction Pack.

    Accessed Oct 8, 2026

  • Soso Medical Sources

    The age a first period usually arrives (NHS, Cleveland Clinic, StatPearls) and how many girls have started by each age (a US national survey).

    Accessed Oct 8, 2026

  • Clue help centre: how old do I have to be?

    US users under 13 cannot use Clue, and users under 16 need a parent or guardian’s permission and help with privacy settings.

    Accessed Oct 8, 2026

  • Clue terms of service

    An account is required, the no-account mode is closed to new users, paid services are for 18+ unless a parent consents, and Clue reserves the right to show ads.

    Accessed Oct 8, 2026

  • Clue help centre: what predictions are available

    Predictions cover periods, PMS, ovulation and the fertile window.

    Accessed Oct 8, 2026

  • Clue: intimacy tracking

    Clue has a tracking category for users’ intimate lives.

    Accessed Oct 8, 2026

  • Clue on the App Store

    The privacy label lists identifiers that may be used to track you and health data linked to you. Logs birth control and has modes for trying to conceive, pregnancy and perimenopause. The listing declares infrequent mature content.

    Accessed Oct 8, 2026