Today’s word is “open.” What does open mean in terms of open platforms and open standards? It’s a tricky concept. Is Windows more open than Mac OS X? Is Linux more open than Solaris? Is Android more open than iOS? Is the Java language more open than C#? Is Firefox more open than Chrome? Is SQL Server more open than DB2?

The answer in all these cases can be summarized in two more words: “That depends.” To some purists, anything that is owned by a non-commercial project or standards body is open. By contrast, anything that is owned by a company, or controlled by a company, is by definition not open.

In reality, there are infinite shades of gray. Openness isn’t a line or a spectrum, and it’s not a two-dimensional matrix either. There are countless dimensions.

Take iOS. The language used to program iPhone/iPad apps is Objective-C. It’s pretty open—certainly, some would say that Objective-C is more open than Java, which is owned and controlled by Oracle. Since iOS uses Objective-C, and Android uses Java, doesn’t that makes iOS open and Android not open?

But wait, perhaps when people talk about the openness of the mobile platforms, they mean whether there is a walled garden around its primary app store. If you want to distribute native apps through Apple’s store, you must meet Apple’s criteria in lots of ways, from the use of APIs to revenue sharing for in-app purchases. That’s not very open. If you want to distribute native apps to Android devices, you can choose Google Play, where the standards for app acceptance are fairly low, or another app store (like Amazon’s). You can even set up your own. That’s more open.

If you want to build apps that are distributed and use Microsoft’s new tiled user experience, you have to put them into the Windows Store. In fact, such applications are called Windows Store Apps. Microsoft keeps a 30% cut of sales, and reserves the right to not only kick your app out of the Windows Store, but also remove your app from customers’ devices. That’s not very open.

The trend these days is for everyone to set up their own app store, whether it’s the Windows Store, Google Play, the Pi Store, AppExchange, Firefox Marketplace, Chrome Web Store, BlackBerry App World, Facebook Apps Center, or the Apple App Store. There are lots more. Dozens. Hundreds perhaps.

Every one of these stores affects the openness of the platform, whether the platform is a mobile or desktop device, browser, operating system, or cloud-based app. Forget programming languages. Forget APIs. The true test of openness is becoming the character of the app store, whether consumers are locked into using open “approved” stores, what restrictions are placed on what may be placed in that app store, and whether developers have the freedom to fully utilize everything the platform can offer. (If the platform vendor’s own apps, or those from preferred partners, can access APIs that are not allowed in the app store, that’s not a good sign.)

Nearly every platform is a walled garden. The walls aren’t simple; they make Calabi-Yau manifolds look like child’s play. The walls twist. They turn. They move.

Forget standards bodies. Today’s openness is the openness of the walled garden.

Alan Zeichick is editorial director of SD Times. Read his blog at