Softwr

Cybersecurity · head to head

Sardine vs Tuta

Sardine logo

Sardine

Cybersecurity

Device intelligence and behaviour biometrics for fraud and compliance

From
On request
Rated
-
Full reviewWebsite
Tuta logo

Tuta

Cybersecurity

Secure, green and ad-free. Email to feel good about.

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Tuta has a free tier, so it costs nothing to try first.
  • Each has a real cost: Sardine signal quality depends on the SDK being embedded in your own web and mobile clients, so fraud improvements become dependent on your app release cycle and any coverage gap is a blind spot.; Tuta individual plan pricing only shown in EUR; no USD conversion provided on site
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Sardine and Tuta actually diverge.

Attributes where Sardine and Tuta differ
AttributeSardineTuta
Starting priceOn requestFree
Pricing modelquotefreemium
Free tierNoYes
PlatformsWeb, iOS, AndroidWeb

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

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 Sardine

  • Device intelligence
  • Behaviour biometrics
  • Scam detection
  • Onboarding risk scoring
  • AML transaction monitoring
  • Dispute and chargeback handling
  • Rules editor

Only in Tuta

Nothing recorded that Sardine does not also cover.

What people use each for

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

Sardine

  • A neobank losing money to authorised push payment scams where the customer genuinely approved the transfernot Tuta
  • A crypto exchange trying to detect accounts being operated by remote access rather than by their ownernot Tuta
  • A fintech seeing synthetic identity signups that pass document verification but share device characteristicsnot Tuta
  • A lender wanting first party fraud signals at application time that a credit bureau file does not containnot Tuta

Tuta

  • Private encrypted email communicationnot Sardine
  • Users valuing end-to-end encryption and zero-knowledge architecturenot Sardine
  • Individuals seeking open-source email clientsnot Sardine
  • Organizations requiring quantum-resistant encryptionnot Sardine

Where each one falls short

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

Sardine

  • Signal quality depends on the SDK being embedded in your own web and mobile clients, so fraud improvements become dependent on your app release cycle and any coverage gap is a blind spot.
  • Behavioural and device telemetry collection needs a documented lawful basis under GDPR, and EU privacy reviews frequently delay rollouts that were scoped as engineering work.
  • Pricing is per session or per active user, so a consumer product with many low value sessions pays in proportion to traffic rather than to fraud exposure.
  • As a younger private company it lacks the enforcement-tested audit history that a bank examiner expects, which makes it a harder sell inside a regulated bank than inside a fintech.
  • It is strongest on session-time signals and weaker as a system of record for long horizon AML typologies, so larger institutions end up running it alongside a traditional monitoring platform rather than instead of one.

Tuta

  • Individual plan pricing only shown in EUR; no USD conversion provided on site
  • Family plan pricing separate (EUR 3 or EUR 8 per additional user) not included in main pricing
  • Shared mailboxes require additional EUR 3-8 monthly charges

Pricing, plan by plan

Sardine

On request
  • Sardine$undefined/year
    • Priced per user session or per monthly active user
    • Annual contract with volume commitment
    • SDK for web, iOS and Android

Tuta

Free
  • Free PlanFree
    • 1 GB storage
    • 1 calendar
    • 3 labels
  • Revolutionary Plan$3/month
    • 20 GB storage
    • 15 email aliases
    • 3 custom domains
  • Legend Plan$8/month
    • 500 GB storage
    • 30 email aliases
    • 10 custom domains

Which should you pick?

Choose Sardine if

  • You need device intelligence.
  • You work on Web, iOS, Android.
  • You also want behaviour biometrics.
Sardine review

Choose Tuta if

  • You want to start without paying.
Tuta review

Questions people ask

Is Sardine or Tuta better?
Neither clearly leads. Sardine starts at On request and Tuta at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Sardine or Tuta?
Tuta has a free tier; the other does not. Paid plans start at On request for Sardine and Free for Tuta.
Does Sardine or Tuta run on more platforms?
Sardine runs on Web, iOS, Android. Tuta runs on Web.
Can I use Tuta for free?
Yes. Tuta has a free tier, so you can try it without paying. Sardine starts at On request.
What is Sardine best used for?
Sardine is most often used for a neobank losing money to authorised push payment scams where the customer genuinely approved the transfer, a crypto exchange trying to detect accounts being operated by remote access rather than by their owner, a fintech seeing synthetic identity signups that pass document verification but share device characteristics, a lender wanting first party fraud signals at application time that a credit bureau file does not contain. Of those, a neobank losing money to authorised push payment scams where the customer genuinely approved the transfer and a crypto exchange trying to detect accounts being operated by remote access rather than by their owner are not what Tuta is typically brought in for.
What can Sardine do that Tuta cannot?
Sardine covers Device intelligence, Behaviour biometrics, Scam detection, Onboarding risk scoring.

Answered from the vendors’ own pages

Sardine: Does Sardine do document verification?

It focuses on device, behavioural and transaction signals, and integrates identity verification providers rather than being one. Treat it as complementary to a KYC vendor.

Tuta: How much does Tuta email cost?

Tuta offers a free plan with 1 GB storage. Paid plans are EUR 3/month (Revolutionary) with 20 GB storage and 15 email aliases, and EUR 8/month (Legend) with 500 GB storage and 30 email aliases. Family plan add-ons cost EUR 3-8 per additional mailbox member monthly.

Source
Sardine: What does it need from us to work?

An SDK in your web and mobile applications plus transaction feeds. Without the client side collector you lose the signals that differentiate it.

Tuta: Is there a free email plan with Tuta?

Yes, Tuta's free plan includes 1 GB of storage, one calendar, three labels, and full end-to-end encryption security features with no custom domains or email aliases.

Source
Sardine: Is pricing published?

No. It is quoted, typically per session or per monthly active user with an annual volume commitment.

Tuta: What are the limits on Tuta's free email plan?

The free plan provides 1 GB storage, access to one calendar, three labels maximum, and no support for custom domains or additional email aliases.

Source
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