Every email app shows the timer, because it is an ordinary image. They differ in how they load and animate it.
| Email app | Animation | Notes |
|---|---|---|
| Apple Mail (Mac, iPhone, iPad) | Yes | Mail Privacy Protection may load images early, so the first view can show a time a few minutes old. Opening again loads a fresh image. |
| Gmail (web, iOS, Android) | Yes | Gmail loads images through its own proxy. |
| Outlook (new, web, Mac, iOS, Android) | Yes | |
| Outlook for Windows (classic) | First frame only | The first frame always shows the correct time left when the email opens. |
| Yahoo Mail, AOL | Yes | |
| Samsung Email, Thunderbird | Yes |
Email apps change their behavior over time. Always send a test to the apps your audience uses.
Why “views” are not “opens”
Inboxclock counts each image download. Some apps download images automatically (for example, Apple Mail Privacy Protection) and some cache them. A view therefore means “the image was downloaded”, not “a person looked at it”. See Stats.
Images turned off
Some readers block images. They see the alt text from the embed code, which states the deadline in words, for example “Countdown to Oct 30, 2026, 10:00 PM (America/New_York)”.
Dark mode
Some apps darken email backgrounds but leave images unchanged. A timer with its own background color looks the same in both modes. A transparent timer takes the email’s background, so check that your number color reads on both light and dark.