RCS vs iMessage in iOS 18: Visual Differences

With the release of iOS 18, Apple integrated Rich Communication Services (RCS) into the Messages app, modernizing cross-platform communication between iPhone and Android users. Although RCS brings modern texting standards—such as high-resolution media sharing, read receipts, and typing indicators—to chats with Android users, Apple maintains clear visual distinctions between these conversations and native iMessages. This guide explains the specific visual cues iOS 18 uses to separate RCS from iMessage.

Bubble Color: Green vs. Blue

The most immediate visual distinction in iOS 18 is the message bubble color.

  • iMessage: Messages sent between Apple devices continue to appear in standard blue bubbles.
  • RCS: Messages sent to Android devices via RCS appear in green bubbles, the same color traditionally reserved for SMS and MMS messages.

Apple chose not to create a third bubble color for RCS, keeping the visual hierarchy simple: blue represents Apple-to-Apple communication, while green represents all cross-platform communication.

The Text Composer Placeholder

You can identify an RCS chat before sending a message by looking directly at the text input field at the bottom of the screen.

  • iMessage: The placeholder text in the composer simply reads "iMessage".
  • RCS: The composer field displays "Text Message • RCS".

If the RCS connection drops or is unavailable on either end, this label will automatically switch to "Text Message • SMS", giving you clear visual confirmation of the protocol currently in use.

Typing Indicators and Read Receipts

While both iMessage and RCS support dynamic status updates, their presentation matches the context of the chat:

  • Typing Indicators: RCS introduces animated typing bubbles to cross-platform chats. While identical in animation to iMessage typing bubbles, they appear within the green-tinted thread context.
  • Status Labels: RCS messages display status labels such as "Delivered" and "Read" directly beneath the bubbles, matching the typography and placement used in iMessage.

Media and Tapbacks

RCS allows high-resolution photos and videos without carrier compression. In iOS 18, these high-definition assets are embedded directly into the green-bubble thread without the low-quality artifacts typical of MMS. Additionally, Tapback reactions sent between iOS and Android users via RCS appear attached directly to the message bubble corners, functioning visually just like iMessage reactions rather than generating separate SMS text notifications.