You can also download the deprecated objective-c version. This version is no longer supported, but can run on 10.8+ systems.
v 3.1 19.07.17
Try the new dark mode in Settings > Appearance.
Search group members by name in large supergroups.
Numerous small enhancements:
Go to sticker pack via the context menu on a sticker in Recent Stickers.
Copy share links to messages in public groups.
Links, mentions, and hashtags now active in link previews for Instagram and Twitter URLs.
Many other fixes and improvements.
v 3.00.1 04.07.17
Bug fixes and minor improvements
v 3.00 30.06.17
Supergroups can now have up to 10.000 members.
Appoint supergroup admins with granular rights. Choose who can add users, manage messages, block members, edit group info & username, add new admins, etc.
Restrict and ban supergroup members with granular precision. Read-only bans, GIF & sticker bans, media bans, temporary bans and restrictions.
Check the new event log to see all service actions taken by members and admins of a channel or supergroup in the last 48 hours – with search and filters.
Change your language in Settings.
Dozens of other quality of life improvements.
v 2.96.94514 25.04.17
Remove recent gifs
Messages context menu improvements
Bug fixes and improvements
v 2.30.51442 03.01.17
Delete messages for everyone. When you delete your messages in groups and one-on-one chats, you can now choose to delete them for everyone in the chat, not just yourself. This works only for recently sent messages (same as editing).
T.me links. Use the short and personal t.me/username instead of telegram.me to link to any Telegram profile, channel or public group.
‘Report spam’ button added to Secret chats.
v 2.28.51253 20.11.16
Groups in common. A new option in your contacts' profiles that shows a list of all groups you share with that person.
Squashed several bugs, including an issue that would cause unusually high CPU usage.
Telegram is a cloud-based mobile and desktop messaging app with a focus on security and speed.