The iPhone, iPad, and iPod touch photo-sharing app Instagram (free; www.instagr.am) has signed up more than 4 million users since it first launched in late 2009. It has also spawned an ecosystem of Instagram- related iPhone, web, and Mac apps, as well as print services and other products. Here’s a look at a few of the many fun things you can do with your Instagram images and feeds.

Map them out

The Instamap iPad app (£1.49; www.instamapapp.com) is a slick Instagram client for the iPad that allows you to browse photos by location or tag. View geotagged images from around the world as pins on a map, or switch to the attractive gallery view. Instamap also makes it easy to add or delete Instagram subscriptions, ‘like’ photos, and leave comments. And it’s updated in real time, so there’s no waiting around for fresh pics.

See your stats

To see a satisfying breakdown of your Instagram statistics, turn to Statigram (free; www.statigr.am). Log in with your Instagram username and password, and then start quantifying. See your most popular images and filters, find out the day of the week you post on the most, view your tags at a glance, and take a peek at your Instagram followers. You can even have your stats emailed directly to you if you feel like sharing them on Instagram or just revelling in your own popularity.

Get more filter options

Instagram has a much-beloved set of 15 retro photo filters that you can apply to an image. For iPhone photographers who want more options, check out the 100 Cameras in 1 app (£1.49; www.100camerasin1.com). It has 100 poetically-named effects that you can mix and match. The app has also just added Instagram support with its latest update, so you can take a photo, edit it in 100 Cameras in 1, and then export it directly to Instagram.

Enjoy the Photos on a Mac

Enjoy browsing Instagram photos on a device with more screen real estate: your Mac. The £2.99 InstaDesk Mac app (www.stylemac.com/instadesk) is a fetching way to look through your Instagram feeds on a desktop. View images by popularity and tags, see everyone who follows you, or find new people to add to your Instagram circle. All the usual Instagram interactivity is here, including the ability to leave and receive comments. You can even save your favourite images to your computer. Unfortunately, you can’t upload images to Instagram from a Mac.

Print your Instagrams

Instagram automatically saves each photograph as a 612 x 612-pixel, 72ppi file. This is pretty small, even by iPhone-photography standards (the iPhone 4S can capture 2,448 x 3,264-pixel images). To make a print of an Instagram shot, you should start by increasing the ppi in an image editor. At the recommended 240ppi, you’ll get a sharp 2.5 x 2.5in print. If you really want it larger, you can blow the image up to 4 x 4in, but that will lower the dpi to 153ppi. The print will be larger, but it will also appear slightly softer and pixelated.

Share and social

If the popular Instagram app for iPhone had a shortcoming, it’s that there was no satisfactory way of viewing photos outside of the iPhone- only app. That changed when Flipboard added Instagram to its social-networking interfaces and InfinitApps entered the field with Instagallery (£1.49, www.instagalleryapp.com).

Instagallery lets iPad and iPhone users view their own Instagram photos and pictures taken by friends, as well as an assortment of the most popular pictures in Instagram’s social network. Photos are shown at full size, against a neutral matte background, and can be sorted according to photographer, location, or tag. Photos can be ‘liked’ and you can directly contact their photographers to express comments and opinions.