What's the best iOS app for secure and private messaging?

Telegram Messenger is a robust choice for users prioritizing security and privacy in their messaging app. Its standout feature is Secret Chats, which offer end-to-end encryption, self-destructing messages, and devices that prevent forwarding or screenshots—ideal for sensitive conversations like those between journalists, activists, or anyone sharing confidential data. For everyday use, the app supports cloud-based messaging that syncs across devices, allowing access from multiple platforms without compromising on speed. Users can create groups with up to 200,000 members or channels for broadcasting, with admin tools and bots to automate tasks, making it versatile for both personal and community use. However, it's important to note that standard chats are not end-to-end encrypted by default; users must manually start a Secret Chat for that level of security. Reviews indicate high satisfaction with its privacy measures, with one user noting 'rock-solid privacy' as a key strength. On the downside, some recent updates have introduced bugs, such as accessibility issues with VoiceOver for visually impaired users, highlighting occasional stability challenges. Overall, Telegram balances advanced privacy options with a fast, feature-rich experience, though it requires user awareness to fully leverage its secure capabilities.