Genmoji Inline Support in Third-Party iOS 18 Apps

Genmoji are compatible with inline message rendering in third-party messaging apps updated for iOS 18, provided those apps implement Apple’s dedicated APIs. Unlike traditional Unicode emojis, Genmoji are dynamic, user-generated images, requiring developers to adopt iOS 18's new text-handling frameworks to render them seamlessly alongside standard text.

How Genmoji Work

Standard emojis rely on the Unicode Consortium, which assigns a specific code point to every recognized emoji character. Because Genmoji are generated on the fly via Apple Intelligence, they do not possess Unicode identifiers.

To overcome this limitation, Apple introduced the NSAdaptiveImageGlyph API in iOS 18. This framework allows custom images to behave like font characters. When an app supports this API, Genmoji can sit directly on the text baseline, scale automatically with font size adjustments, and be copied, pasted, and formatted just like regular text.

Third-Party App Compatibility

For a third-party messaging app—such as WhatsApp, Telegram, or Signal—to render Genmoji inline, the app must meet specific developer requirements:

  • Adoption of NSAdaptiveImageGlyph: Developers must update their text inputs, chat views, and rendering engines to support adaptive image glyphs within attributed strings.
  • Rich Text Architecture: The messaging service's backend and client applications must be capable of transmitting and parsing rich text or image-linked metadata alongside plain text payloads.

Apps that have updated their text engines to support these frameworks can display Genmoji inline on devices running iOS 18.2 or later.

Fallback Behavior

When a Genmoji is sent to or from an app that has not been updated with the iOS 18 API, the system falls back to standard media formats:

  • Unsupported iOS Apps: The Genmoji typically renders as a standalone image attachment or sticker rather than inline text.
  • Cross-Platform Delivery (Android and Web): Because non-Apple platforms lack native support for NSAdaptiveImageGlyph, the receiving platform receives the Genmoji as a standalone image, sticker, or inline image attachment depending on how the messaging service handles rich media fallbacks.