What can you usually customize?
Common controls include contact name, avatar, message text, timestamps, delivery states and the order of bubbles. Interactive tools may also support typing indicators, notifications or timed message delivery.
The quality of the result depends on spacing, text wrapping and how well the tool handles the final device size.
Generator versus simulator
A generator normally creates one image. A simulator displays the conversation as a functioning scene, which is more useful for recording or on-device performance.
Neither tool needs access to a real iMessage account or phone number.
What are legitimate uses?
Fictional messages can support screenwriting, storyboards, videos, interface concepts and film props. Use invented identities or explicit permission, and do not turn the output into fake proof of a real conversation.
For public content, labels such as “dramatization” or clear fictional context can reduce confusion.
A visual conversation builder
An iMessage generator creates the appearance of a conversation. It does not send messages, verify identities or prove that an exchange occurred.