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animation in HEY Mail

Works animation works in HEY Mail.

Works in 5 of 21 · partial in 1 · not supported in 15

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

The fix for the clients that need it

Needed in 16 of 21: Gmail, Gmail Android, Gmail iOS and 13 more.

Replace CSS animation with an animated GIF

instead 
<!-- Use an animated GIF for the effect -->
<img src="https://example.com/badge-animated.gif"
  width="60" height="24" alt="New!"
  style="display: inline-block; border: 0;" />
Show the original
before 
<style>
  @keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
  .badge { animation: pulse 2s infinite; }
</style>
<span class="badge">New!</span>

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Your next question

Every feature in HEY Mail · animation in every client

Questions

How many email clients support animation?
It works in 5 of 21, partial in 1, not supported in 15.
Does animation work in Fastmail?
animation works in Fastmail. Closest to HEY Mail: Fastmail, which agrees on 173 of the 235 features both are tested on.

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

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Real captures 14 Oct 2026 on 10 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 7 Apr 2026 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping