Ad network Greystripe has always been confident in its ability to operate a competitive business on iOS, despite having to take on Apple on its home turf.

The latest numbers released by the firm, however, suggest that it's been iAd's comparatively late appearance on iPad that has handed the firm its success, with Greystripe claiming its iPad ads currently outperform those it runs on both iPhone and Android.

Video star

In total, Greystripe reports its iPad service - which boasts support for ads created using Flash, transcoding them to run on iOS – has served up more than 100 iPad ad campaigns in the last nine months.

Each of those campaigns has delivered, on average, 60 seconds of engagement time, with 20 percent of those who view them going on to actively engage with the pictures or videos at hand.

Indeed, when it comes to successful ad types, Greystripe claims videos are the most popular format on offer, outclassing images to a greater degree than on mobile formats, no doubt due to the size of the screen.

In comparison, iAd as a whole has had a particularly sticky time of late, with Apple dropping the minimum ad buy to $500,000 as fill rates reportedly fell to as low as 6 percent after Christmas.

[source: MobileBeat]