MacBook Air 15-inch (M4) Screen Protectors

The MacBook Air 15-inch (M4) has a 15.3-inch display. That figure is the diagonal measurement, so it doesn't on its own tell you a protector will fit, two devices with the same diagonal can have different corner radii and cutouts. Always buy one listed for the MacBook Air 15-inch (M4) by name.

Privacy is the default choice for the MacBook Air 15-inch (M4). A micro-louvre layer narrows the viewing angle so only the person in front sees the screen.

Worth knowing before you buy: noticeably dimmer, expect to raise brightness; awkward for sharing photos or watching video with someone.

Somewhere between £8 and £25 covers almost everyone. Under about £8 you're usually buying glass with no oleophobic coating, which looks fine for a week and then smears permanently.

Above £25 you're paying for a warranty, a better applicator, or a speciality finish like privacy or paper-feel. Those are real benefits, but they're refinements. The jump in protection from nothing to a £10 protector is far larger than the jump from £10 to £30.

Only if you buy a magnetic or slide-in filter. Adhesive ones are effectively permanent, and a privacy filter makes it impossible to show your screen to anyone standing beside you.

Given that a privacy filter also dims the display for you, removability is worth paying a few pounds more for on a laptop you use for presentations or pair programming.