The honest answer to whether you need a screen protector is that it depends entirely on which problem you're solving, and most people are solving the wrong one. A screen protector does very little about drops. A case does that. What a protector buys you is scratch resistance, and whether that's worth €15 comes down to your pockets and your resale plans.
The short answer: if you have an iPhone 12 or newer, keep it in a dedicated pocket and upgrade every couple of years, you probably don't need one. If you carry it loose with keys and coins, or plan to trade it in, a protector is cheap insurance against scratches. It does almost nothing for drops either way.
The trade-off Apple can't engineer around
Since the iPhone 12, Apple has used Ceramic Shield, glass with ceramic nanocrystals embedded in it, developed with Corning. With the iPhone 17 line came Ceramic Shield 2, which Apple describes as three times more scratch-resistant than the previous generation.
One nuance worth knowing, because most coverage skips it: Apple has told press that the 3x figure refers to scratches accumulated over time rather than resistance to a single contact. It isn't a hardness rating.
Underneath the marketing sits a physical constraint no engineering removes. Harder materials resist scratching and shatter more readily; softer materials flex, absorb impact and scratch more easily. You cannot maximise both at once. Apple has optimised for the expensive failure, a cracked screen, and accepted the cheaper one.
What actually scratches a phone?
Not keys, in most cases. Independent testing by JerryRigEverything found Ceramic Shield 2 taking only light marks at level 7 on the Mohs hardness scale, where phone glass typically starts scratching at level 5 or 6.
That number matters because of what sits at level 7: quartz. Sand and fine silica grit from pockets, bags, tables and beaches is harder than phone glass, which is why a single unlucky encounter with grit does what a pocketful of coins doesn't.
| Material | Mohs hardness | Will it scratch a modern iPhone screen? |
|---|---|---|
| Copper coins | 3 | No |
| Steel keys | 5 to 6 | Rarely, and marks often wipe off |
| Titanium jewellery | 6 | Can leave faint grooves |
| Quartz sand and grit | 7 | Yes |
| Concrete dust | 7 or above | Yes |
There's a second effect worth knowing, because it explains a lot of complaints. Many marks people describe as scratches are wear in the oleophobic coating rather than damage to the glass. Once that coating degrades, the surface shows smudges, glare and micro-abrasion far more readily. Ceramic Shield 2 improved the coating's durability, but it still wears.
So who actually needs a screen protector?
Yes, if you carry the phone loose with keys and coins. Not because keys will gouge it, but because pockets and bags are where grit lives.
Yes, if you plan to resell or trade in. A scratched screen visibly reduces value, and a protector keeps the glass pristine underneath. On a phone you'll trade after two years, €15 is straightforwardly good arithmetic.
Yes, if imperfection bothers you. This sounds soft and isn't. A hairline scratch visible only at certain angles doesn't affect touch or clarity, but if you know it's there you'll see it every day. Some people genuinely don't register it. Others find it maddening. Knowing which you are is most of the decision.
Probably not, if you have a recent iPhone, keep it in a dedicated pocket, and upgrade often. Reviewers testing Ceramic Shield 2 over several months have reported the glass holding up well enough that a protector starts to look like an unnecessary expense.
The argument against one that nobody makes
Newer iPhones ship with an anti-reflective coating on the display, and testing by Astropad found that a standard glass screen protector can cancel that effect out. You'd be paying €15 to remove a feature you already paid for.
If you do buy one for a recent iPhone, it's worth finding a protector with anti-reflective properties of its own rather than the cheapest available sheet.
The part that matters more
Here's what gets lost in the debate: a screen protector adds minimal drop protection. It's a thin layer on a flat surface, and it does almost nothing about the physics of a fall.
What protects a screen in a drop is a raised edge on the case. A lip standing proud of the glass means the phone lands on the case rather than face-down on the screen, and it keeps the display off the table every time you put the phone down, which over a year is thousands of small contacts with hard surfaces.
Every Casey case has that raised edge, along with dual-layer construction, a rigid polycarbonate shell over a shock-absorbing TPU liner, which handles the corner impacts that actually break phones. That's covered properly in tough case vs clear case vs silicone.
If you're deciding where to spend, the case is the higher-leverage purchase by a wide margin. The protector is an add-on for scratch and resale, not a substitute.
Using both
Tempered glass protectors are harder than Ceramic Shield, which is exactly why they work as a sacrificial layer. They take the abrasion so the glass underneath doesn't.
One practical note when pairing them with a tough case: a raised case edge and a full-coverage protector can interfere if the protector's edges sit under the lip. Case-friendly protectors are cut slightly smaller for this reason. Worth checking rather than discovering after application.
Our cases fit iPhone 11 through 17 Pro Max, including iPhone Air and the 16e, all precision-cut per model. The fit detail matters here too, as covered in iPhone case compatibility.
The honest limitation
We don't sell screen protectors, so take the recommendation for what it is: we have nothing to gain from you buying one, and nothing to lose from you skipping it.
What we do sell is the case, and the raised-edge argument above is us making the case for our own product. It happens to be the accurate one, but you should weigh it knowing that. The independent testing is linked; check it rather than taking our word for it.
FAQ
Do you need a screen protector with a tough case?
They solve different problems. A tough case with a raised edge handles drops; a screen protector handles scratches and preserves resale value. Neither replaces the other.
Is Ceramic Shield scratch-proof?
No, it's scratch-resistant. Independent testing found Ceramic Shield 2 taking light marks at Mohs level 7, and quartz sand sits at exactly that level, so grit will still mark it.
Does a screen protector help in a drop?
Very little. A raised case edge that keeps the screen off the ground does far more for drop protection than a thin layer on the glass.
Why does my screen look worn but not scratched?
Often it's the oleophobic coating wearing rather than the glass being damaged, which makes smudges and glare far more noticeable.
Can a screen protector affect display quality?
It can. Testing has found standard glass protectors cancelling out the anti-reflective coating on newer iPhones, so look for one with anti-reflective properties if you're buying for a recent model.
