iPhone Twitter App Comparison Chart by John Tokash (blog.tokash.org)          
           
           
  twittelator tweetsville twitterrific twitterfon tweetie
Price 4.99 3.99 9.99 free 2.99
Free Option yes   yes yes  
Open Source       yes  
Version 1.6.1 1.2 1.1.1 1.4 1.2
Reading Functionality          
  twittelator tweetsville twitterrific twitterfon tweetie
Friends Timeline yes yes combined yes yes
Public Timeline yes   combined   yes
View Replies to Me yes yes combined yes yes
Mark Tweet as a Favorite yes yes yes yes yes
View Favorites yes yes combined yes yes
View My Tweets yes yes     yes
View Inbound Direct Messages no yes combined yes yes
View Sent Direct Messages   yes combined yes yes
Trends yes yes   yes yes
Scroll to Unread     yes yes  
Scroll to Last Read yes   yes   yes
Auto refresh yes     yes  
Tapping the top of the screen scrolls immediately to the top of your tweet list   yes yes yes yes
Groups - see streams of tweets from a specific selection of users yes        
Multiple Accounts yes       yes
TwitPics images are shown inline yes        
Embedded TwitPic viewer         yes
Save twitpic images to photo album         yes
Multiple Themes yes yes yes   yes
Multiple Font Sizes         yes
Reply Navigation yes     yes yes
Instapaper Integration         yes
Email link to Tweet         yes
Offline Reading yes yes yes yes  
Writing Functionality          
  twittelator tweetsville twitterrific twitterfon tweetie
Write Tweet yes yes yes yes yes
Write Tweet has friend chooser yes     yes  
Insert Pic yes yes yes yes yes
Location aware yes   yes yes yes
Save Tweet as draft yes   yes yes yes
Tweet edit has symbol selector yes        
Retweet functionality yes yes   yes yes
Reply yes yes yes yes yes
Direct Message yes yes yes yes yes
Delete Tweets yes yes   yes yes
URL Handler and/or bookmarklet yes   yes yes yes
Landscape Keyboard Option         yes
Switch 'from' User in Compose Screen ?       yes
Post Link to this Tweet         yes
Offline Compose     yes yes yes
Searching Functionality          
  twittelator tweetsville twitterrific twitterfon tweetie
Search yes yes   yes yes
Show nearby tweets yes yes   yes yes
Search nearby tweets yes yes      
Search within all friends tweets          
Advanced Search Constructor yes yes      
Search History or Bookmarked Searches yes     yes yes
Clicking #tags in tweets take you to a search yes   Safari yes yes
Link Functionality          
  twittelator tweetsville twitterrific twitterfon tweetie
Embedded Browser yes yes yes yes yes
Safari yes yes yes yes yes
Tweet link yes     yes yes
Email link yes     yes yes
Follow urls in tweets yes yes yes yes yes
Handle $AAPL Style Links yes       yes
History is maintained between tweet link clicks in embedded browser     yes yes yes
Shortened links are resolved before you have to go to the browser          
User Management          
  twittelator tweetsville twitterrific twitterfon tweetie
See lists of Followers and Following per user yes yes Safari yes yes
Follow and Unfollow users yes yes Safari yes yes
Access user profiles yes yes sometimes yes yes
Access user timelines yes yes Safari yes yes
See "followers" stream for a given user          
See "following" stream for a given user          
Browse a list of friends to get, quickly, to individual timelines          
List of Recent users clicked yes        
Block / Unblock users         yes
Look up user yes (search) yes (search)   yes (search) yes