iMessage is Apple’s messaging service, built into the Messages app on iPhone and Mac. Conversations between Apple users are end-to-end encrypted by default, and an opt-in Contact Key Verification mode guards against impersonation.
iMessage
apple.com/imessageA covered pick. Anyone can use it as a private drop-in, with no setup or know-how. Enough for most people. Threat levels
For Apple-to-Apple chats it is end-to-end encrypted with no setup, which already beats plain SMS and the Meta apps for the average person. The honest limits keep it out of the top tier: anything to an Android phone falls back to unencrypted SMS, Apple holds the metadata of who you message and when, and iCloud Backup can stash your message keys unless Advanced Data Protection is on. Fine as the default among iPhone users. For cross-platform privacy, Signal is the real answer.
Measures the security configuration of the tool's own website, not the privacy of the product itself. A strong tool can still score low here.
iMessage alternatives
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