Not a free update, either.
iPhone developer Atebits has released Tweetie 2, a new version of its popular Twitter application.
Key features include the ability to handle multiple Twitter accounts, an offline mode for use when a user doesn't have a connection, an improved composition screen, and the ability to link Twitter contacts with Address Book contacts.
There is also a location-based feature where nearby tweets are plotted onto a Google Map.
Atebits hasn't just innovated with the features, though. Most developers, when redesigning an iPhone app to this extent, would release it as a free 'v2.0' update for existing users.
However, Atebits has chosen to make Tweetie 2 an entirely separate application, charging £1.79 to old and new users.
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Other iPhone developers will doubtless be watching how it sells - and the reaction from users - to judge whether they can follow suit with their own apps.
Early indications are good: Tweetie 2 has rocketed to fourth spot in the UK App Store paid apps chart, and the vast majority of user reviews are four or five stars.
