Apple Inc is easing restrictions for building iPhone and iPad applications, a move that should allow for the use of third-party tools such as Adobe Systems' Flash software and could ease the tension between the two companies. Shares of Adobe surged over 12 percent at mid-afternoon on Nasdaq on Thursday, after Apple announced the changes.

Apple's about-face follows a high-profile spat with Adobe last spring that saw Steve Jobs sharply criticise Flash technology. Apple had been criticised by developers for what they called onerous restrictions on building apps. Apple had effectively banned developers from using the popular Flash software and other technology to build apps for iOS, the operating system that powers the iPhone and iPad. Gleacher & Co analyst Brian Marshall said Apple was feeling huge pressure from app developers. “What spurred this on was the uproar from the growing iOS developer base,” Marshall said. “People liked using Flash, and now they'll be able to use a bunch of different technologies.”

Apple's initial insistence that developers only use its tools to build apps also drew scrutiny from US regulators. But Apple said it will relax “all restrictions on the development tools used to create iOS apps, as long as the resulting apps do not download any code. This should give developers the flexibility they want, while preserving the security we need.”

Analysts say the changes mean developers will be able to build apps using Flash tools, and then convert them to run on iOS, something that was not previously allowed. However, analysts say the changes do not mean that the iPhone and the iPad will be able to run Flash-based websites. Jobs has slammed the Flash technology as unreliable and ill-suited for mobile devices. Apple did not respond to requests for additional details about the changes. “We have listened to our developers and taken much of their feedback to heart,” the company said in a press release.

Hudson Square analyst Daniel Ernst said Apple's previous restrictions on app-building tools never made sense if the company wanted to make it as easy as possible to lure developers to the iPhone and the iPad. “That never seemed like a great idea in the first place, and the marketplace gets to decide,” he said. Apple had previously argued that apps that were not built specifically for its devices simply would not work right.

In a bid to be more transparent, Apple also said Thursday it will publish App Store Review Guidelines for the first time, to help developers understand how submitted applications are considered. This had been another controversial area for some developers who had complained that the approval process has been opaque and arbitrary. The introduction to the guidelines states: “If your app doesn't do something useful or provide some form of lasting entertainment, it may not be accepted.” It also states: “If your app looks like it was cobbled together in a few days … please brace yourself for rejection.”

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