Seddit

With Seddit you can continuously listen to posts and comments from your favourite subreddits for as long as you like using your preferred text-to-speech voices. Load some posts from URLs or subreddits, and then just press play and sit back and listen. Posts and comments by different users can be spoken with different voices. You can configure Seddit to automatically load more posts when it's running out of things to speak so that you can keep listening non-stop… or you can set up the sleep timer so it will stop reading after a certain amount of time. If you use VoiceOver, Seddit can use your VoiceOver settings to speak. 

Seddit supports AirPlay, as well as playback controls on your headphones, phone's lock screen, and so on, just as you'd expect from any audio app. The posts you've loaded into Seddit will be synced across all your devices using your iCloud account. No internet connection is needed to read — only to load the posts in the first place. No Reddit signin is needed.