Yesterday, Marco Arment’s excellent Instapaper app for iOS was updated with some thoughtful new features. Among these are combined length/progress indicators for saved articles à la Kindle, new sharing options, and a Light/Dark theme toggle within articles on the iPhone or iPod touch (this has been present on the iPad for a while).

Naturally, there’s one more thing.

Not only can small-screened iOS devices now toggle Light/Dark mode within an article, but Marco built an amazing location-aware feature that checks the sunset times for your locale and automatically switches to Dark mode at night and Light mode during the day. Marco describes this feature as “ridiculous.” I describe it as wonderful.

Instapaper is a great free service on the web, but I have found the iOS app well worth the $5 several times over. And each free update makes it even better. Needless to say, I love how many apps, including Twitterrific, have Instapaper support for sending links to read later.

If you aren’t using Instapaper, shame on you.