Delta Chat
Decentral Private Messenger
Free
Delta Chat is a reliable decentralized instant messenger that is easy and fun to use for friends, family, groups and organizations. Delta Chat is developed by a dedicated FOSS contributor community that jointly releases refinements and new features several times a year, across many stores and platforms world-wide.
Features at a glance:
• Private. Instant on-boarding without a phone number or other private data.
• Friends & Family: Only chat with people you know. Unknown users cannot message or follow you without mutual consent.
• Flexible. Supports multiple chat profiles and is easy to setup on multiple devices.
• Reliable. Works under bad and adversarial network conditions.
• Secure. Audited End-to-End encryption safe against network and server attacks.
• Sovereign. Can be run with your own e-mail address or server.
• FOSS. Fully Open Source/Free Software, built on Internet Standards.
more - Increase resilience of multi-relay usage: if on relay goes down, messages are still received in the others
- In the chat list, swipe a read chat to the right to mark it "unread"
- Allow to switch profile when sharing or forwarding
- Add group descriptions
- Leave groups and channels before deletion
- Support GIF stickers
- Increase reply swipe sensitivity
- Add tab bar icon bounce animation on tap
- Tons of bug fixes
2.48.0 2 Apr
- Faster preview and notifications of large messages
- Improve "Connectivity View"
- Truncate file names in the middle, not at the end; important information are more often at the end
- Experimental calls are now native
- Fix: Notifications are now removed when you open their respective chat on a different device
- Fix: No longer receive empty or ":" notifications when using experimental location sharing
- Fix: Improve QR codes handshake on special server configurations
- Fix: Fixed case where daymarkers could show the wrong date
- Fix: Online indicator in the chat navigation bar now updates correctly when returning from background
- Fix: Reset a previously removed setting that prevented adding new relays
- Fix: Do not upscale small images
- Fix: Restart I/O when there are new transports in a sync message
- Fix: Disable partial search by contact address, which results in apparently random results as address is not shown
- Fix: More reliable parsing of relay QR-codes and -links
- Fix: Prevent possible infinite loop with invalid SMTP row
- Fix: Sync broadcast subscribers list
These features will roll out over the coming days. Thanks for using Delta Chat!
2.43.0 26 Feb
- Scanning a QR code with a relay ask for adding it as additional transport
- Ask for device owner verification on profile deletion
- Better logging
- Simplify automatic deletion options
- Fix: Show input-bar after QR scan immediately
- Fix: Remove sometimes misleading "Please wait..." after QR code scan
- Fix: Do not set normalized name for existing chats and contacts; it takes too long sometimes
- Fix: Show relays in connectivity view by their hostname
- Fix: Synchronize default relay immediately after changing it
- Fix: Let securejoin succeed even if the chat was deleted in the meantime
- Fix: Ask before sharing via a direct-share link
- Fix: Show "Mark Read" icon on iOS 14/15
- Fix: Open chat after creating contact manually
- Fix: Add manually added contacts to member list
- Fix: Adding contacts manually is not possible for groups
2.35.0 19 Jan
- Handle additional relays
- Improved metadata protection
- Better multi-device: synchronize group creation across devices
- Improve onboarding speed
- Links in messages are now highlighted
- Improve navigation in offline help
- Lots of bug fixes
These features will roll out over the coming days. Thanks for using Delta Chat!
2.33.0 11/12/2025
- Disappearing messages options range from 5 minutes to 1 year now
- Share email address for email contacts instead of vCard
- In case of errors, tapping message text or status opens "message info" directly
- Flatten profile menu
- Show possible notification issues prominently in settings
- Show addresses for address contacts only
- Option to copy contact profile's "Encryption Info" to the clipboard
- User colors get a more consistent appearance
- Create user colors based on cryptographic identity instead of address
- Withdraw all QR codes when one QR code is withdrawn
- Support TLS 1.3 session resumption
- Fix avatar color in vcards
- Fix removing Exif data from corrupted images
- Fix: Make calendar files available as an attachment
- Fix transparency of larger stickers
- Fix: do not show letter icon for partially downloaded messages
- Fix: notifications now show up while the app is inactive in foreground (eg when in the app switcher)
- Fix group creation and verification issues
These features will roll out over the coming days. Thanks for using Delta Chat!
2.22.1 30/10/2025
- Allow to clone email chats
- Fix: Prevent the drag preview from showing upside down when long pressing reaction on an image
- Fix some small bugs
- Add Estonian translation
These features will roll out over the coming days. Thanks for using Delta Chat!
2.11.0 14/08/2025
- In Delta Chat, version 2.x, everything is encrypted by default - no locks or other symbols required.
- Version 2.x also comes with improved profiles
Recent changes in 2.10.0:
- Do not enlarge default icons as 'Saved Messages' or 'Device Chat'
- Show 'Saved Messages' icon in title
- When tapping an address, open existing encrypted chat, if any
These features will roll out over the coming days. Thanks for using Delta Chat!
2.10.0 07/08/2025
- Separate between unencrypted and encrypted chats, avoiding mixing of encrypted/unencrypted messages in the same chat
- Removed padlocks, as encrypted is the default "normal" state. Instead, unencrypted email is marked with a small letter icon
- Green checkmarks removed where they mostly refer to encryption, which is the default now. They are still used for profile's
"Introduced by"
- Classic email chats get a big letter icon making it easy to recognize
- Option to create a new email with subject and recipients
- Images with huge pixel sizes are sent as "Files"
- Indicate which message was scrolled to
- Easier recognizable date headlines
- Improve sorting "Saved Messages"
- Improve logging and error handling
- Lots of bug fixes
2.9.0 01/08/2025
- Separate between unencrypted and encrypted chats, avoiding mixing of encrypted/unencrypted messages in the same chat
- Removed padlocks, as encrypted is the default "normal" state. Instead, unencrypted email is marked with a small letter icon
- Green checkmarks removed where they mostly refer to encryption, which is the default now. They are still used for profile's "Introduced by"
- Classic email chats get a big letter icon making it easy to recognize
- Option to create a new email with subject and recipients
- Images with huge pixel sizes are sent as "Files"
- Indicate which message was scrolled to
- Easier recognizable date headlines
- Improve sorting "Saved Messages"
- Improve logging and error handling
- Lots of bug fixes
2.8.0 31/07/2025
- Access "Media" by an dedicated icon in chat's upper right corner
- "All Media" are available from the settings
- Speed up opening profiles
- Show "Disappearing Messages" state alrady in menu
- Fix sending voice messages if "Settings / Chats / Media Quality" is set to "Worse Quality"
- Fix: align avatar in groups to message
- Fix: return correct results when searching for a space
- Fix: show video recoding and similar errors in an alert
- Fix: video compression on iOS 16
- Fix: attaching GIFs and webP from gallery
- Fix: drag and drop videos on iOS 15
- Fix: attaching files on iOS 15
These features will roll out over the coming days. Thanks for using Delta Chat!
1.58.6 26/06/2025
- Fix notification sound
- Fix bitrate for "worse" outgoing media quality
- Save multiple selected messages in one go
- Improve voice message UI
These features will roll out over the coming days. Thanks for using Delta Chat!
1.58.5 21/05/2025
- Nicer profile, focusing on recognising contacts
- Fix adding chats from different profiles to widget
- Fix: Show errors if changing address fails
- Fix long tapping chats on iPad
These features will roll out over the coming days. Thanks for using Delta Chat!
1.58.4 17/05/2025
- Select and send multiple images at the same time
- Recode videos to reasonable quality and size
- Attach images and videos as original files
- Support pasted GIFs
- Notifications in Notification Center are grouped by chat
- More characters in notification before truncating
- Bug fixes
These features will roll out over the coming days. Thanks for using Delta Chat!
1.58.3 11/05/2025
- Modernise "Close" button in overlay sheets
- Full-screen display of own avatar from "your profile" settings
- Tapping info messages with contacts open the contact's profile
- Hide superfluous "Show Classic E-mails" advanced setting for chatmail
- Add a message with further information when securejoin times out (instead of allowing to send unencrypted)
- Forwarding messages do not inherit "Edited" state
- Data saving: do not send messages to the server if user is the only member of the chat in single-device usage
- Synchronize contact name changes across devices
- Hide address in primary settings screen, so it cannot be passed around without e2ee info
- Show self bio summary in primary settings screen
- Further metadata protection: encrypt message's sent date
- Bug Fixes
These features will roll out over the coming days. Thanks for using Delta Chat!
1.58.1 14/04/2025
- Edit your messages
- Delete your messages for everyone
- Search "Saved Messages" from title bar (it was available in profile before)
- Remove "Manage Keys" and "Import Autocrypt Setup Message"; use "Add Second Device"
- Allow better avatar (profile picture) quality
- Remove notifications from chat that was deleted from other device
- When a chat is deleted, also delete its messages from server
- Add mute option "8 hours"
- Improve deletion confirmation for "Device Messages"
- Fix decompression get stuck, leading to random errors sometimes
- Fix rare crash when switching server and server reports bad quota
- Fix names of explicitly attached files
- Fix hiding of "disappearing messages" icon in edit mode
- Fix rare crash when viewing avatars
- Fixed more minor bugs
These features will roll out over the coming days. Thanks for using Delta Chat!
1.54.5 16/03/2025
• Accessibility: voice over reads a reaction summary for messages
• Sync message and chat deletion to other devices
• Allow scanning multiple QR-invitation codes without needing to wait for completion to scan the next one
• Do not allow non-members to change ephemeral timer settings of groups
• Properly display padlock when the message is not sent over the network
• When reactions are seen in one device, remove notification from your other devices
• Don't disturb with notification when someone leave a group
• Share files generated by webxdc apps directly
• Tweak menu order
• Save space by Deduplicating files on sending
• Detect incompatible profiles from newer app version when importing them
• Show sender in "Saved Messages"
• Bug fixes
These features will roll out over the coming days. Thanks for using Delta Chat!
1.54.3 04/03/2025
- Improve "message menu": many options are now faster accessible
- Unify buttons and icons
- When forwarding to "Saved Messages", if possible, save the message including context
- Option to copy scanned QR code text to clipboard
- Fix "Add Second Device" issues when scanning older QR codes
- Fix vcards reading issues
- Fix: Allow to share contacts that do not have a chat
These features will roll out over the coming days. Thanks for using Delta Chat!
1.54.0 12/02/2025
- Add option to "Save" a message to the messages' context menu
- Saved messages are marked by a little star
- In the "Saved Messages" chat, messages are shown in context and have an option to go to the original
- The app now requires less storage by deduplicating newly received/sent files
- Show 'unconnected' and 'updating' states in profile switcher
- Add 'Paste from Clipboard' to onboarding QR code scanners
- Detect Stickers when dropped, pasted or picked from Gallery
- Modernize menus
- Clearer icons
- Clearer QR code reset options
- Bug fixes and more
These features will roll out over the coming days. Thanks for using Delta Chat!
1.52.2 02/02/2025
- Append dropped URLs to text field instead of attaching as file
- Drag images from a chat and drop it to another chat or even to another app (use a second finger for navigating!)
- Paste .webp images via drag'n'drop
- Add "Copy Image" to messages' conext menu
- Long-tap a proxy to share or delete
- More modern attach menu
- "Message Info" is moved to messages' context menu at "More Options / ..."
- To easier differ between multiple profiles, set a "Private Tag" (long tap profile switcher)
- In profile switcher's context menu, you have quick access to "Mute Notifications" for a profile
- Sort profiles to top in profile switcher, see context menu
- Allow cancelling profile edits, force a name when editing profile
- Fix scrolling issue when cancelling a screen
- Fix layout of 'No contacts found' message
These features will roll out over the coming days. Thanks for using Delta Chat!
1.50.5 19/01/2025
- New widget to access favourite chats (requires iOS 17)
- Modern look for the settings pages
- New Notification settings screen
- Option to toggle notifications for mentions
- Long-tap links for copying to clipboard
- Much smoother, motion reduced message list when using attach or other options
- Lots of bug fixes
These features will roll out over the coming days. Thanks for using Delta Chat!
1.50.4 11/01/2025
- Don't change order of proxies when selecting a new one
- Add info messages about implicit membership changes if group member list is recreate
- Fix encrypted messages failures on some accounts (ignore garbage at the end of keys)
- Fix: Don't add "Failed to send message to ..." info messages to group chats
- Fix: Add self-addition message to chat when recreating member list
- Fix not showing "Notifications: Connected" even though PUSH is available (do not subscribe to heartbeat if already subscribed to PUSH)
- Fix "Show Full Message" being empty sometimes (if multiple text parts are cut)
These features will roll out over the coming days. Thanks for using Delta Chat!
1.50.3 15/12/2024
- Show notifications for reactions on own messages
- Icons for Dark-mode and tint colors
- offer to open http-links detected as proxy also in the browser
- Improve compatibility with classic email clients in outgoing messages
- Mark "Saved Messages" chat as protected
- bug fixes
These features will roll out over the coming days. Thanks for using Delta Chat!
1.50.1 08/12/2024
- fix: show forward-icon on iOS 15 and older
- Add an option to use Proxy-servers (#2382, #2390)
- Show on Chatlist if there are Proxy-servers (#2383)
- Detect Proxy-servers in Chat-messages (#2389)
- Share Proxy-servers with your friends, family and allies (#2394)
- fix: no startup delay when processing PUSH notifications in parallel, just show "Updating..." in title bar
1.48.4 05/12/2024
- do not miss new messages when being inside a chat, the "Back" button now has an "unread" badge
- select multiple chats or messages with two-finger pan gestures
- improve chatlist swipe gestures: trailing to mute/archive/delete - leading to pin/mark-read
- save traffic by using compression
- automatic reconfiguration, e.g. switching to implicit TLS if STARTTLS port stops working
- parallelize IMAP and SMTP connection attempts
- improve DNS caching
- always use preloaded DNS results
- prioritize cached results if DNS resolver returns many results
- HTTP(S) tunneling
- allow to mute or unmute multiple selected chats at the same time
- check device owner (Passcode, Fingerprint, FaceID) on "Add Second Device", "Export" and "Password & Account"
- allow to copy text from "Message Info"
- fix scrolling and jumping when opening a chat and during chatting. solid!
- more bug fixes
These features will roll out over the coming days. Thanks for using Delta Chat!
1.48.3 05/11/2024
- Add "Share invite link"-button to "QR Invite Code"-Screen (#2276)
- Enhance "edit name" dialog (#2286)
- Share contact from "contact profile" (#2273)
- Share Log as file (#2205)
- Tune down "copy to clipboard" on "contact profile" (#2274)
- "Invite friends" from settings and "New Chat" (#2277)
- Hide email in "New chat"-list for trusted contacts (#2272)
- Hide option to add contacts manually when chatmail (#2283)
- Fix a bug that the message-timestamp didn't update occasionally (#2270)
- Show contact when tapping on their name in Reactions-overview (#2259)
- Mark bots as ... bots (#2254)
- Improve chat-deletion-confirmation (#2254)
- Update core to 1.142.12
- Improve security and QR-code generation
- Update core dependencies and remove obsolete ones
1.46.10 19/09/2024
- Increase resilience of multi-relay usage: if on relay goes down, messages are still received in the others
- In the chat list, swipe a read chat to the right to mark it "unread"
- Allow to switch profile when sharing or forwarding
- Add group descriptions
- Leave groups and channels before deletion
- Support GIF stickers
- Increase reply swipe sensitivity
- Add tab bar icon bounce animation on tap
- Tons of bug fixes
more Version 2.48.0 2 Apr
Data Not Collected The developer does not collect any data from this app.
