· comms

Signal vs Threema

Signal's policy answers the question and is graded A. Threema's doesn't say either way. That's a finding about the document, not a worse grade.

Grades read the plan most people are on. Each company's full entry has every plan, every clause and the archived copy it was read from.

Signal

Signal's own policy says it cannot decrypt or access the content of your messages or calls. Not a promise not to train on them — a statement that they are not readable to Signal at all.

Verdict

By default: Does not train on you by default
The way out: Cannot train on you: the content is not readable to them
What A means: Cannot train on you. Your content is not available to the company in usable form.
Last checked: 5 Oct 2026

Read the full verdict →

Threema

Threema publishes two privacy policies and both of them govern its website. Neither describes what the messenger does with your messages. That is a documented absence, not a finding against the app.

Verdict

By default: The policy does not say
The way out: Nothing to opt out of on the record
Last checked: 2 Oct 2026

Read the full verdict →

Signal: every plan

Signal · what each plan can refuse · checked 5 Oct 2026

1 PLAN

Plan

Exposure

Trains

Opt-out path

Retention

De-identified

Human review

All accounts

5 / 100

CANNOT

Nothing to opt out of

Not stated

How the score is made5 / 100 · the rubric

Default3 / 50

The company states it cannot reach your content

Way out0 / 33

Nothing is on, so nothing needs refusing

Paywall0 / 4

No paywall on the control

Scope0 / 4

One kind of data is in scope

Human review0 / 4

The policy says people do not read it

De-identified2 / 2

Nothing is said about de-identification

EVERY CELL ABOVE IS SOURCED FROM A QUOTED CLAUSE OR A DOCUMENTED SEARCH · SEE THE EVIDENCE ABOVE

EXPOSURE IS SCORED 0–100 ON ONE AXIS, HOW HARD IT IS TO STOP THIS PLAN TRAINING ON YOU. THE GRADE IS THE BAND IT FALLS IN: A 0–10 · B 11–25 · C 26–45 · D 46–60 · E 61–80 · F 81–100. HOW THE SCORE IS SET

All accountsTRAINS: CANNOT

OPT-OUT: Nothing to opt out of
RETENTION: Not stated
EXPOSURE: 5 / 100
DE-IDENTIFIED: Not stated
HUMAN REVIEW: No

Threema: every plan

Threema · what each plan can refuse · checked 2 Oct 2026

1 PLAN

Plan

Exposure

Trains

Opt-out path

Retention

De-identified

Human review

All accounts

UNCLEAR

Not established, see below

Not stated

—

Not established

EVERY CELL ABOVE IS SOURCED FROM A QUOTED CLAUSE OR A DOCUMENTED SEARCH · SEE THE EVIDENCE ABOVE

All accountsUNCLEAR

OPT-OUT: Not established
RETENTION: Not stated
EXPOSURE: —
DE-IDENTIFIED: —
HUMAN REVIEW: Not established

Every grade on this page is the one on the company's own entry, read from a dated, archived copy of its policy. Nothing here is computed separately. How grades are set · All comparisons