Delta Chat
Delta Chat: A free, open-source messenger that combines default encryption with email interoperability. Ranked #6 of 44 in Encrypted Messaging Apps by our editors (8.6/10); pricing: Free plan; best for open-source messaging with email interoperability.
At a glance
- Editor score8.6 / 10
- PricingFree plan
- Best forOpen-source messaging with email interoperability
- Free planYes
- Paid fromFree
- Encryption coverageDefault
- Facts checked21 Sep 2026
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
Our verdict on Delta Chat
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.
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Delta Chat pricing
Delta Chat fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Encryption coverage | Default |
| Maximum group size | Not verified |
| Linked device limit | Not verified |
| Desktop app | Yes |
| Voice and video calls | Yes |
| Disappearing messages | Yes |
| Encrypted backups | None |
| Deployment | Desktop, Mobile |
| Platforms | Windows, macOS, Linux, iOS, Android |
| Support | Community, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | delta.chat |
| Facts checked | 21 Sep 2026 |
Alternatives to Delta Chat
- SignalA free, private messaging app with broad calling, sharing, and platform support.9.4
- WhatsAppA free, feature-rich choice for encrypted everyday messaging and calls.9.3
- ElementEncrypted collaboration with flexible deployment, open source foundations, and broad platform support.9.1
See all Delta Chat alternatives →
Delta Chat vs the competition
- Delta Chat vs Signal
- Delta Chat vs WhatsApp
- Delta Chat vs Element
- Delta Chat vs Wire
- Delta Chat vs Messenger
- Delta Chat vs SimpleX Chat
Compare Delta Chat with any tool side by side →
Also Ranked In
Delta Chat is ranked in 4 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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