Tweetbot for Mac is one of a small handful of apps that I couldn’t live without, and they’re celebrating their 2.1 update with a tidy little discount today. [Tweetbot, $10. Normally $13]

And in case you missed it, Tweetbot’s excellent iOS app also got its long-awaited 4.0 update. If you have the previous version, you’ll always be able to upgrade for $5 by buying an app bundle, but if you’re new to the app, you can get it for the same price for a limited time. [Tweetbot 4, $5. Will rise to $10 after a launch promotion]

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