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Update: Over the course of the evening, ROM Manager was updated yet again, to version - this time adding support for the TWRP recovery, which is undoubtedly a feature many users have been wanting for some time. Just update ROM Manager in the Play Store and you'll have it.

ROM Manager, one of the most useful and versatile tools available for a consummate ROM-flasher, got an update today, bringing the app up to version The update brings just two changes – a bug fix, and something much more significant: support for delta downloads.

For those who are unfamiliar with the term, "delta downloads" are like the Play Store's smart updates, CyanogenMod's built-in update system, or the files users can download with CyanDelta – bite-size update files that only pack the things that have changed since your ROM's last build. Using delta updates decreases download times, data usage, and hassle in keeping your ROM on the bleeding edge.

deltaprocessing delta

Images: Koushik Dutta

Want to know how it works? In a post to Google+, ROM Manager's developer Koushik Dutta explains all. Essentially, when the user chooses to download a delta update, a list of other zip files downloaded by ROM Manager is sent to a delta server. The server then creates an "edge frequency graph" to determine what exactly has changed between the zip files. Then, "the edges (deltas) with the highest frequency are prioritized for delta creation on the server." Sound complicated? Luckily, you won't have to think about any of this, as the whole process executes pretty smoothly. If the delta update fails, ROM Manager will fall back to the latest full zip file.

Koush warns that this (awesome) functionality is "probably super buggy and beta," but promises plenty of work on bugs, and further streamlining of the process once the feature is "fully baked." To grab the update, just hit the widget below. For more info, check out Koush's post on Google+.

Source: Google+

Liam Spradlin
Liam loves Android, design, user experience, and travel. He doesn't love ill-proportioned letter forms, advertisements made entirely of stock photography, and writing biographical snippets.

  • Jay T

    I'll continue using CyanDelta. It's free, and is really reliable, as well as creating really small downloads.

    • Peter

      Agreed, most of CWM's apps are buggy and he shouldn't be adding new features while they crash so much

      • http://twitter.com/zackeryfretty Zackery Fretty

        Hmmm, I own all of Koush's apps and don't have this problem on any device I own.

        • http://twitter.com/redbullcat Phil Oakley

          Same. Koush's apps have always been brilliant for me.

    • http://flavors.me/sabret00the sabret00the

      But the name CyanDelta sucks though.

      On a more serious note, Rom Manager is much more fully featured to be fair to it.

      • Jay T

        I don't mind the name, although they may need to change it when they start supporting other ROMs.

        You're right, though. The two apps are very different, but when you compare them on only that feature, I prefer CyanDelta.

  • Dabu Xian

    Kinda late to the party, I'm not using ROM manager since the updater was included into CM.

  • Rick Fisher

    does rom manager have AOKP? That's my biggest reason for not switching from CM to AOKP. I'm tempted by the additional features, but none seem to be ones I REALLY need, and I am in love with the simplicity and speed of cyandelta or even just the cm updater. And do you still lose all of your rom settings in AOKP when you update the rom? I was never a fan of having to re-input all of my settings or wait a few days for AOKP backup to update in the play store to upgrade with my settings

  • http://www.facebook.com/rmkattan Rami Kattan

    ROM Manager just got updated to, with support for TWRP, I don't really understand why:

    ROM Manager is the GUI for CWM, to allow installing zips in batch and other stuff, now it supports TWRP, and twrp already has a bunch of free tools that support it..... why should I use ROM Manager over others?

    • http://www.facebook.com/people/Dustin-Lehman/1321902066 Dustin Lehman

      Its because ROM manager can be a recovery controller app, and when Koush refused to allow outside access to ROM manager source code, thats when TWRP was born. Koush was very bullheaded about allowing anyone other than his own apps use ROM manager in any form. TWRP is more feature rich than CWM is and its totally free, CWM Touch you have to buy. Another plus for TWRP is its ability to "batch" queue installs, CWM doesn't do this.

      • http://www.facebook.com/rmkattan Rami Kattan

        ROM Manager pro allows batch/queue installed, not the free one.

        the question is: will ROM Manager free allows batch install for twrp?

        i already use twrp and I love it over CWM.