Delta Chat review
A free, open-source messenger that combines default encryption with email interoperability.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Delta Chat is a free, open-source messaging app for private conversations, groups, channels, and one-to-one audio or video calls. It is designed for people who want default end-to-end encryption across mobile and desktop while retaining interoperability with chatmail relays or compatible email servers. Native applications cover Android, iOS, Windows, macOS, and Linux. The feature set also includes voice messages, file attachments, disappearing messages, multiple profiles, multi-device support, QR-code and invite-link contact setup, and isolated in-chat web applications.
Its clearest distinction is the combination of encrypted messaging and email-based transport. Chatmail relays, classic email servers, and Webxdc in-chat apps give Delta Chat a broader ecosystem fit than a messenger limited to a single proprietary network. Private groups give members equal rights, while channels support one-to-many broadcasting. The published group guidance recommends no more than 150 members, despite there being no strict technical limit. For users who value open-source software and flexible account or server arrangements, these capabilities support a focused alternative to conventional messaging platforms.
The main consideration is backup handling: exported backups are not encrypted. That makes backup workflows an important part of the product decision for users with sensitive message archives. Delta Chat is a strong choice for people seeking free, open-source messaging with default encryption, wide platform coverage, email interoperability, and Webxdc support. It is less suitable for buyers who require encrypted exported backups or prefer a service that operates independently of email servers and relays. Its free model also keeps the product straightforward for individuals and groups that do not need paid service tiers.
Delta Chat pros and cons
- Where it wins
- Default end-to-end encryption across messages and attachments
- Native apps for Android, iOS, Windows, macOS, and Linux
- Channels, calls, groups, disappearing messages, and Webxdc apps
- Where it doesn't
- Exported backups are not encrypted
- Groups are practically recommended for no more than 150 members
- Messaging depends on chatmail relays or compatible email servers
Delta Chat fact sheet, pricing and score →
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