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Healthcare · head to head

Clue vs Signant Health

Clue logo

Clue

Healthcare

Period and cycle tracking app owned by German company Biowink, positioned around science based tracking and a published stance against sharing data with law enforcement

From
Free
Rated
-
Full reviewWebsite
Signant Health logo

Signant Health

Healthcare

eCOA-first clinical trial platform that has grown outward into EDC, eConsent and televisits

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Clue has a free tier, so it costs nothing to try first.
  • Each has a real cost: Clue clues stated policy on not sharing data with law enforcement without a valid legal process is the companys own published position and legal interpretation, not an independent guarantee, and it can still be compelled to comply with a legally binding request under EU or other applicable law.; Signant Health no pricing is published, and the software licence is a minority of the real bill once instrument licensing, translations, device provisioning and services are added, so early budget estimates are routinely too low.
  • They diverge on capability: Clue covers Cycle and symptom tracking, Signant Health covers eCOA and ePRO.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Clue and Signant Health actually diverge.

Attributes where Clue and Signant Health differ
AttributeClueSignant Health
Starting priceFreeOn request
Pricing modelFree with a Plus subscriptionquote
Free tierYesNo
PlatformsiOS, AndroidWeb, iOS, Android

Identical on both: user rating (Not yet rated), category (Healthcare).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Clue

  • Cycle and symptom tracking
  • Cycle insights and patterns
  • Research partnerships
  • EU-based data hosting
  • Fertility and conception mode
  • Perimenopause and other life stage tracking

Only in Signant Health

  • eCOA and ePRO
  • Unified platform
  • eConsent
  • Randomisation and supplies
  • TeleVisits
  • Rater training
  • Data surveillance
  • Instrument library

What people use each for

The jobs each tool is most often brought in to do.

Clue

  • Someone specifically weighing data jurisdiction and legal exposure when choosing a period tracking app, given Clues EU basis and published stance on law enforcement requestsnot Signant Health
  • A user who wants cycle tracking positioned around scientific research partnerships rather than lifestyle or community contentnot Signant Health
  • A buyer comparing Clue directly against Flo on current published privacy policy language before choosing which app to trustnot Signant Health
  • Someone tracking perimenopause or other non-standard cycle stages that some period apps do not support wellnot Signant Health

Signant Health

  • A central nervous system or psychiatry trial where the primary endpoint is a rated scale and rater consistency decides the readoutnot Clue
  • A global study needing an outcome instrument translated and linguistically validated across a dozen languagesnot Clue
  • A decentralised or hybrid protocol combining televisits, eConsent and at-home patient reported outcomesnot Clue
  • A sponsor consolidating separate eCOA, eConsent and randomisation vendors onto one platform to cut reconciliation worknot Clue

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Clue

  • Clues stated policy on not sharing data with law enforcement without a valid legal process is the companys own published position and legal interpretation, not an independent guarantee, and it can still be compelled to comply with a legally binding request under EU or other applicable law.
  • Deeper cycle insights and predictions, the features most likely to justify tracking in the first place, are gated behind the Clue Plus subscription rather than fully free.
  • Being a smaller company than some competitors, Clue has less capital and legal resource to contest large-scale legal requests than a larger, better-funded rival might, despite its stated intent to do so.
  • Research partnerships using anonymised user data, while opt-in, still mean user-derived data can be used in ways beyond direct app functionality, and users should check current consent settings.
  • Cycle predictions rely on self-reported data and general population models, so accuracy for irregular cycles or specific medical conditions remains limited regardless of which app is used.

Signant Health

  • No pricing is published, and the software licence is a minority of the real bill once instrument licensing, translations, device provisioning and services are added, so early budget estimates are routinely too low.
  • Linguistic validation is charged per instrument per language and is on the critical path to first patient in, so adding a country late in start-up produces both a cost and a schedule hit.
  • Provisioned participant devices bring logistics, replacement, shipping and cellular connectivity obligations that persist for the life of the trial and are frequently underestimated.
  • The EDC component is newer than the eCOA heritage, so sponsors with complex data management requirements often keep an incumbent EDC and lose the single-database benefit that justifies the platform.
  • It is priced and scoped for sponsor-grade trials, which makes it a poor fit for investigator-initiated or academic studies that need outcome collection without the services layer.

Pricing, plan by plan

Clue

Free
  • Clue Plus$9.99/month
    • Free tier covers core cycle tracking, logging and basic predictions
    • Clue Plus adds deeper cycle insights, extended predictions and personalised content
    • Annual Plus plans typically offered at a lower effective monthly rate

Signant Health

On request
  • SmartSignals Unified Platform$undefined/year
    • Priced per study through a sales process
    • Modules selected per protocol: EDC, eCOA, randomisation, eConsent, TeleVisits
    • Instrument licensing paid to scale owners on top of platform cost

Which should you pick?

Choose Clue if

  • You need cycle and symptom tracking.
  • You want to start without paying.
  • You work on iOS, Android.
  • You also want cycle insights and patterns.
Clue review

Choose Signant Health if

  • You need ecoa and epro.
  • You work on Web, iOS, Android.
  • You also want unified platform.
Signant Health review

Questions people ask

Is Clue or Signant Health better?
Neither clearly leads. Clue starts at Free and Signant Health at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Clue or Signant Health?
Clue has a free tier; the other does not. Paid plans start at Free for Clue and On request for Signant Health.
Does Clue or Signant Health run on more platforms?
Clue runs on iOS, Android. Signant Health runs on Web, iOS, Android.
Can I use Clue for free?
Yes. Clue has a free tier, so you can try it without paying. Signant Health starts at On request.
What is Clue best used for?
Clue is most often used for someone specifically weighing data jurisdiction and legal exposure when choosing a period tracking app, given clues eu basis and published stance on law enforcement requests, a user who wants cycle tracking positioned around scientific research partnerships rather than lifestyle or community content, a buyer comparing clue directly against flo on current published privacy policy language before choosing which app to trust, someone tracking perimenopause or other non-standard cycle stages that some period apps do not support well. Of those, someone specifically weighing data jurisdiction and legal exposure when choosing a period tracking app, given clues eu basis and published stance on law enforcement requests and a user who wants cycle tracking positioned around scientific research partnerships rather than lifestyle or community content are not what Signant Health is typically brought in for.
What can Clue do that Signant Health cannot?
Clue covers Cycle and symptom tracking, Cycle insights and patterns, Research partnerships, EU-based data hosting. Signant Health covers eCOA and ePRO, Unified platform, eConsent, Randomisation and supplies.

Answered from the vendors’ own pages

Clue: Does Clue share data with law enforcement?

Clue publishes a policy stating it does not share health data with law enforcement or public authorities without a legally binding request and states it will challenge requests it considers improper. This is the companys stated position; verify the current policy directly for specifics.

Signant Health: What is Signant best at?

Electronic clinical outcome assessment, particularly rated scales in central nervous system and psychiatry trials, together with rater training and endpoint quality services.

Clue: Why does Clue emphasise being an EU company?

Clue operates under EU GDPR data protection rules and states this legal basis makes it harder for authorities outside the EU, including US authorities, to compel data disclosure than for a company based in the US.

Signant Health: Is pricing published?

No. Everything is quoted per study, and instrument licences, translations and devices sit on top of the platform cost.

Clue: Is Clue free?

Core cycle tracking, logging and basic predictions are free. Deeper insights and extended predictions require Clue Plus.

Signant Health: Can I use it only for eCOA?

Yes. The modules are selected per protocol, and many sponsors take eCOA and eConsent while keeping an existing EDC.

Signant Health: What drives the timeline?

Translation and linguistic validation of outcome instruments, which is per language per instrument and sits on the critical path to study start.

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