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Electric Slide is an excellent presentation sharing app with unique features

It's not often I test an app that leaves me inspired about its possibilities. That's been the case with Electric Slide. This free app (restrictions described below) lets you give a presentation using PowerPoint, a document or a PDF to up to five people wherever they are in the world. You can originate your presentation from any computer, or almost any iOS device (specific iOS requirements at the end of this post).

Once you upload your files to the Electric Slide servers, participants log in from a browser (or iPhone or iPad app) and watch in real time. For audio, you'll have to rely on a conference call or third-party audio conference software.

To test the service, I uploaded a Keynote presentation I converted to PowerPoint, plus a PDF file. The upload was fast, and within seconds the presentation was available on the web. I shared it with a few friends, changing pages on my iPad, and confirmed that page changes were virtually instantaneous. Color fidelity was accurate. Others viewed my presentation in Safari on OS X with no issues. I could also access a presentation using the Electric Slide iPhone app. Although the slides were a bit small, they were perfectly readable with the phone in landscape mode.

People who do presentations frequently will be excited about the Electric Slide service. Your audience can join from the airport or a car from any iOS device or laptop.

Now about the limitations and costs. You can use the app for free, but presentations are limited to 90 minutes with no more than five participants. You can upload a total of 50 MB for free to the Electric Slide servers. Many people will want or need more, so that's when the costs come in.

For US$26.99, you get three months of service, which includes 1 GB of storage, up to 50 viewers, and no length restrictions on meetings. A six-month plan is $48.99, and an annual plan will set you back $79.99. Given the quality of the service, and ease of use, this pricing is not too high.

There are other limitations. Keynote is not supported yet, but it is coming. As mentioned, there is no voice feature, so you're on your own there. Videos embedded in presentations are not yet supported, but it is coming. Many users are also asking about live annotations on presentations, but nothing has been said about that yet.

In some ways, Electric Slide competes with services like GoToMeeting, although that service runs $468 a year. For the extra money, you get audio and video conferencing, something that Electric Slide doesn't offer.

Still, Electric Slide works well, is very easy to start using and lets you try it for free. Your presentations can originate from any computer, or nearly any iOS device with internet connectivity. You can also get your presentation onto a big screen using a cable connection, AirPlay to an AppleTV or just bring a web browser running on the projector and join the presentation that way.

I don't do too many presentations these days, but if I was I would eagerly sign up for an Electric Slide account. It's innovative, reasonable and flexible.

You will also want to take a look at SlideShark, a service with slightly different pricing but some free options as well. SlideShark, at least for now, supports only PowerPoint.

Electric Slide can run on any iPhone from the 3GS forward, on the third-generation iPod touch or newer, as well as any iPad. The app is optimized for the iPhone 5 and requires iOS 5.01 or greater.

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