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Cybersecurity · head to head

Proton Mail vs ThetaRay

Proton Mail logo

Proton Mail

Cybersecurity

Secure email that protects your privacy

From
Free
Rated
-
Full reviewWebsite
ThetaRay logo

ThetaRay

Cybersecurity

Unsupervised AI transaction monitoring for cross-border and correspondent banking

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Proton Mail has a free tier, so it costs nothing to try first.
  • Each has a real cost: Proton Mail paid plan pricing not displayed on vendor site; ThetaRay unsupervised models are harder to justify to an examiner than explicit rules, and some regulators still expect documented threshold logic, which can force you to run both systems.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Proton Mail and ThetaRay actually diverge.

Attributes where Proton Mail and ThetaRay differ
AttributeProton MailThetaRay
Starting priceFreeOn request
Pricing modelfreemiumquote
Free tierYesNo

Identical on both: platforms (Web), 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 Proton Mail

Nothing recorded that ThetaRay does not also cover.

Only in ThetaRay

  • Unsupervised detection
  • Cross-border focus
  • Sanctions screening
  • Alert triage
  • Customer risk scoring
  • Cloud native

What people use each for

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

Proton Mail

  • Encrypted email communicationnot ThetaRay
  • Privacy-focused email servicenot ThetaRay
  • Family email protectionnot ThetaRay

ThetaRay

  • A correspondent bank that cannot see the ultimate originator and needs behavioural signals rather than counterparty listsnot Proton Mail
  • A cross-border payments fintech whose rules engine produces more alerts than its compliance team can clearnot Proton Mail
  • A bank under a regulatory consent order needing demonstrable improvement in detection within a fixed periodnot Proton Mail
  • A payment institution entering a high-risk corridor where existing thresholds were calibrated on domestic trafficnot Proton Mail

Where each one falls short

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

Proton Mail

  • Paid plan pricing not displayed on vendor site
  • Free tier limited to 1 GB storage
  • Free tier limited to single email address

ThetaRay

  • Unsupervised models are harder to justify to an examiner than explicit rules, and some regulators still expect documented threshold logic, which can force you to run both systems.
  • The alert reduction claim depends heavily on your data, so a parallel run is essential and adds months and cost before you can decommission the incumbent.
  • Coverage is strongest in cross-border and correspondent flows; institutions whose risk is domestic retail fraud will find the fit weaker than a general-purpose monitoring platform.
  • It is a smaller vendor than the incumbents, so integration connectors into legacy core banking systems are often bespoke work rather than a supported adapter.
  • Model retraining and tuning are vendor-led, which means changing detection behaviour is a support conversation rather than something your own analysts can do that afternoon.

Pricing, plan by plan

Proton Mail

Free

No published plan breakdown. See the Proton Mail review.

ThetaRay

On request
  • ThetaRay Sonar$undefined/year
    • Priced by monitored transaction volume and number of monitored entities
    • SaaS on Azure with regional data residency options
    • Parallel run and model tuning included in onboarding

Which should you pick?

Choose Proton Mail if

  • You want to start without paying.
Proton Mail review

Choose ThetaRay if

  • You need unsupervised detection.
  • You also want cross-border focus.
ThetaRay review

Questions people ask

Is Proton Mail or ThetaRay better?
Neither clearly leads. Proton Mail starts at Free and ThetaRay at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Proton Mail or ThetaRay?
Proton Mail has a free tier; the other does not. Paid plans start at Free for Proton Mail and On request for ThetaRay.
Does Proton Mail or ThetaRay run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Proton Mail for free?
Yes. Proton Mail has a free tier, so you can try it without paying. ThetaRay starts at On request.
What is Proton Mail best used for?
Proton Mail is most often used for encrypted email communication, privacy-focused email service, family email protection. Of those, encrypted email communication and privacy-focused email service are not what ThetaRay is typically brought in for.
What can Proton Mail do that ThetaRay cannot?
ThetaRay covers Unsupervised detection, Cross-border focus, Sanctions screening, Alert triage.

Answered from the vendors’ own pages

Proton Mail: Is there a free version of Proton Mail?

Yes, Proton Mail offers a free plan with 1 GB storage, 1 encrypted email address, and basic features like folders, labels, and filters.

Source
ThetaRay: Does it replace a rules engine entirely?

Rarely on day one. Most institutions run it alongside existing rules during a parallel period, and some keep specific regulator-mandated rules permanently.

Proton Mail: What does the Mail Plus plan include?

Mail Plus includes 15 GB storage, 10 encrypted email addresses, support for 1 custom domain, 10 hide-my-email aliases, priority support, and access to Proton Calendar.

Source
ThetaRay: Where is the data processed?

SaaS runs on Microsoft Azure with regional deployment options, which is the mechanism for meeting data residency conditions in regulated markets.

Proton Mail: What is included in Proton Unlimited?

Proton Unlimited provides 500 GB storage, 15 email addresses, 3 custom domains, unlimited hide-my-email aliases, access to Mail, Calendar, VPN, Drive, and Pass, plus dedicated support.

Source
ThetaRay: Is sanctions screening included?

Screening is available on the same platform but licensed as part of the commercial package rather than bundled by default. Confirm it is in your quote.

Proton Mail: Does Proton Mail offer a money-back guarantee?

Yes, Proton Mail provides a 30-day money-back guarantee for paid plans.

Source
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