You&#x27;ll need a Mac and Xcode to install (but you don&#x27;t need to be a developer).<p>Instructions video: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=D_01P4-ubdA" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=D_01P4-ubdA</a><p>If you get weird blue and yellow circles,<p>=&gt; turn OFF <i>&#x27;Reduce White Point&#x27;</i> in <i>Settings &#x2F; General &#x2F; Accessibility &#x2F; Increase Contrast</i><p>Note: it works because you don&#x27;t need to be a developer to load apps to your iPhone via Xcode anymore<p>Note2: it uses &quot;private&quot; APIs so it won&#x27;t be accepted into the App Store (just like <i>f.lux</i>).