HAppy

What Is This App?
hAppy was designed to be fast, easy to use, highly accessible and nice to look at. It runs on nearly all iOS devices from iPhone 4 over 6+ to the iPad Air. It supports image uploads to your ADN file storage as well. hAppy is written by Dominik Hauser @dasdom

Main Features

 * Create posts with links, locations or files
 * Various mute filters (user, client, hashtag or conversations)
 * Stream marker support
 * Inline image view
 * Unified stream
 * Global stream
 * Conversations
 * Private messages
 * Read and write in patter rooms
 * Drafts
 * Image sharing via app.net file API
 * Different fonts and colors (In-App purchase)
 * Highly accessible
 * Writes and reads post language

Note: hAppy doesn't provide push notification support!

Minimum System Requirements
Requires iOS 8.0 or later.

Source
hAppy is open source.