How many email clients support visibility?

It works in 13 of 21, not supported in 8.

Does visibility work in Apple Mail?

visibility works in Apple Mail. Closest to Samsung Mail: Apple Mail, which agrees on 248 of the 297 features both are tested on.

visibility in Samsung Mail

Works visibility works in Samsung Mail.

Works in 13 of 21 · not supported in 8

Which clients

Works: Outlook 365, Outlook (New), Outlook iOS, Outlook for Mac, Apple Mail, Apple Mail iOS, Yahoo Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, Fastmail, Superhuman
Not supported: Gmail, Gmail Android, Gmail iOS, Outlook Classic, Outlook Android, Yahoo Mail, Yahoo Mail Android, AOL Mail

The fix for the clients that need it

Needed in 8 of 21: Gmail, Gmail Android, Gmail iOS and 5 more.

Use conditional comments or remove hidden content

instead

5 lines

<!-- For screen readers, use font-size: 0 trick -->
<div style="font-size: 0; max-height: 0; overflow: hidden;
            mso-hide: all;" aria-hidden="true">
  Preheader text
</div>

Show the original

before

3 lines

<div style="visibility: hidden;">
  Hidden content for screen readers
</div>

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Every feature in Samsung Mail · visibility in every client

Questions

How many email clients support visibility?: It works in 13 of 21, not supported in 8.
Does visibility work in Apple Mail?: visibility works in Apple Mail. Closest to Samsung Mail: Apple Mail, which agrees on 248 of the 297 features both are tested on.

To see what in your email Samsung Mail does not support, paste the whole email.

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Real captures 14 Oct 2026 on 11 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 28 Feb 2019 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping