CPUTool lets iOS jailbreakers underclock their CPU and GPU

Apple doesn’t provide much by way of power savings on the iOS platform aside from the Low Power Mode feature and therefore the use of general wisdom with relevance reducing battery drain. Fortunately, those searching for over what Apple seems willing to supply out of the box may well be in luck as of in the week.

Say hello to CPUTool, a newly released jailbreak tweak created by iOS developer Soh Satoh that lets the user underclock their handset’s CPU and/or GPU performance in an endeavor to optimize power consumption.

As depicted within the screenshot examples above, CPUTool makes underclocking simple via configuration sliders. Users can toggle underclocking for CPU and GPU performance individually and use the sliders to throttle down performance – 100% equates to power of attorney, and 50% would be half power of attorney, and so on. Moreover, users can blacklist specific apps so the underclock is simply applied to certain power-hungry apps.

A Respring button is incorporated into the top-right of the CPUTool preference pane within the Settings app so you’ll save any changes you create.

For most people, Apple’s native hardware configurations are probably adequate for a day’s worth of iPhone usage, and therewith in mind, CPUTool targets two separate audiences: 1) those with older devices that require to be throttled all the way down to survive daily on one charge; or 2) those with a persistent yearning to tinker with their device’s performance.

According to the developer, CPUTool doesn’t modify any system files, and since it comes within the style of a jailbreak tweak, the hardware tinkering only applies to the jailbroken state. What’s more is users can validate their underclocking ends up in trusted benchmarking software, like Geekbench 5:


It should even be noted that CPUTool can only be used for underclocking at this point. This effectively means you won’t be able to augment your device’s speed performance via overclocking, but you’ll underclock to witness gains in battery life at the expense of device speed performance.

Those inquisitive about tinkering with their device’s hardware performance and augmenting its battery life should purchase CPUTool for $2.50 from the Packix repository via their preferred package manager, and if you own the developer’s AOD tweak already, then you’ll enjoy 25% off of CPUTool.

CPUTool appears to figure on jailbreak iOs 13 devices, although it’s worth noting that GPU throttling isn’t supported on every device. The developer has not provided a comprehensive list of compatible devices at this point, but he does state that the tweak has been tested on the subsequent setups: iPhone XS with iOS 13.3, iPhone X with iOS 13.3.1, iPhone 6 Plus with iOS 12.4.5, and iPad Air with iOS 11.4.

Will you be giving CPUTool a whirl? allow us to know what you’re thinking about the concept within the comments section below.

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