The highly anticipated Instagram photo app has arrived on Android devices; drawing in more than 1 million downloads within the first 24 hours of its release, but users have noticed some differences.

Instagram has quickly become one of the most popular photo sharing apps on the market, but it has only been available to Apple iOS users since it launched in October 2010, which put the Android app in very high demand.

The Android app offers an extremely familiar Instagram experience when compared to the iOS app, Instagram said in its announcement Tuesday. You'll find all the same exact filters and community as our iOS version.

The company's statement is, in the most part, true. Instagram for Android comes with a similar layout and interface to the iOS, but there are some notable differences depending on what type of phone the app is downloaded on.

One of the main differences is the absence of the tilt shift/blur (shallow depth of field illusion feature), which allows users to focus on one subject in the image while distorting the background. The Android version also comes without the advanced camera feature which automatically crops a photo to match Instagrams specs. I have to resize (crop) every photo i take or upload, why? Samantha Blackwell asks on Mashable's website.

Some users have noticed that the app takes up considerable space on their phones. On the Samsung Galaxy Nexus, the app took up 17MB, according to Computer World, who warn their readers to upload the app only if they have additional space on their phones.

On the Galaxy Nexus, the process of capturing, editing and filtering the photos are similar to the iPhone, but the camera mode on the Galaxy Blaze 4G is different, Computer World reports. When taking a photo a dialog box prompts the user to pick a source and when camera is selected it diverts the user to the native Galaxy Blaze photo app.

You can tweak these settings to force the app to take pictures itself by going to the app's settings on the home screen. This only seems to work on certain phones, however. On the LG Marquee, the app crashed when I tried to open the Instagram camera. Instead, I had to take my photo in the native camera app, crop it, and only then was I switched back to the Instagram user interface, Computer World's Ginny Mies writes in a blog post.

The infamous Instagram filters that can turn normal images into vintage-looking Polaroid's, is almost identical to the iOS interface. The only difference noted by some users is that the X-Pro filter is a little darker on the Android version of the app.

Sharing options are also similar on both apps, with the options to email and post on popular social media sites. On The Android app there are also additional options to share via Gmail, Google message and Google +.

Android users have had mixed reactions towards the new app. Tried it on my Desire HD. Works great. Smooth and fast. But it seems like a port from IOS. It still has a back button, which isn't necessary on android. And the sharing is limited, since Instagram doesn't use Android´s share function. And how do I export the instagrammed photo? Or is it locked inside the app? Another IOS-thingy, Tor Ivan Boine wrote in a comment on Mashable.

Works fine and fast on Samsung Galaxy Ace with CyanogenMod 7.2 RC1. But the tilt-shift detail... makes me cry, another user wrote.

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