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The iPhone Duo ships on 23 October and its screen is the part most likely to need protecting first. A foldable is two panels, one of them 7.6 inches, meeting at a hinge that opens thousands of times a year, and the protector market for it arrived before the phone does. Six of the ten options we checked exist as pages today; every pick below was read off a live product page rather than a press roundup.
The naming on these pages is worth a warning before you buy. ESR sells six Duo sheets with near-identical handles, two of them under a slug about 7X tempered glass that render a product called Armorite, and Mous requires you to pick the Duo from a device list rather than landing on it. We read the price and title off each page after loading it, because guessing from the address bar would have put the wrong product next to the wrong price.
| # | Protector | Best for | Price |
|---|---|---|---|
| 1 | ESR UltraFit Armorite Pro 3-Pack | Reinforced Corning, 3-pack | $35.99 |
| 2 | ESR UltraFit Armorite Pro Privacy 3-Pack | Privacy filter | $37.99 |
| 3 | Spigen GLAS.tR EZ Fit Pro | Big-name glass | $34.99 |
| 4 | Spigen GLAS.tR EZ Fit Pro Privacy | Privacy, big brand | $39.99 |
| 5 | Mous Tempered Glass 2-Pack | Case-maker glass | $34.99 |
| 6 | ESR UltraFit Armorite 2-Pack | Mid-range 2-pack | $18.99 |
| 7 | ESR UltraFit Armorite 3-Pack | Value 3-pack | $21.99 |
| 8 | ESR UltraFit Armorite Pro 2-Pack | Corning, 2-pack | $29.99 |
1. ESR UltraFit Armorite Pro 3-Pack (Best Overall Protection)
Price: $35.99
Corning glass in a reinforced frame, in threes, and the auto-alignment tray is what makes it the least fiddly option here. On a foldable the install is the hard part: the inner display is a different panel from the outer one, and a protector that goes on wrong is a protector you will do twice.
This is the closest thing to a default answer for the Duo. It is also the only one on this list where the frame is built around the fold rather than adapted to it afterwards, which matters on a phone whose hinge is rated in cycles rather than years.
2. ESR UltraFit Armorite Pro Privacy 3-Pack (Best Privacy Option)
Price: $37.99
Privacy glass shows the screen only to whoever is directly in front of it. On the Duo’s 7.6-inch inner display that is worth more than it is on a slab phone, because a foldable held open is visible from across a table.
This is the reinforced Corning privacy option rather than the cheaper tempered one at $21.99, so it is the more durable of ESR’s two privacy sheets. The trade is the one every privacy filter makes: the display dims from every angle except straight on, and none of that brightness comes back.
3. Spigen GLAS.tR EZ Fit Pro (Best Known Brand Alternative)
Price: $34.99
Spigen’s Duo protector sits within a dollar of ESR’s and is sold through the same kind of tray, so the argument between the two is closer than the price gap suggests. The GLAS.tR line is the one Spigen puts its name on for scratch resistance.
Spigen publishes no drop height for this product and no scratch cycle count, which is a genuine gap next to ESR’s material claims. What it does publish is the EZ Fit alignment frame, and on a foldable that frame matters more than most of the specification.
4. Spigen GLAS.tR EZ Fit Pro Privacy (Best Privacy From a Big Name)
Price: $39.99
The privacy counterpart to the pick above, and the most expensive sheet on this list. It covers the inner display, which is the one most people will actually be reading on a foldable.
Against ESR’s $37.99 privacy 3-pack you get one sheet here rather than three, and no stated material. That is the honest comparison: if you expect to scratch this protector and replace it, ESR is cheaper over three units. If you want one brand for everything, Spigen already has a Duo case and a lens protector in the same line.
5. Mous Tempered Glass 2-Pack (Best From a Brand That Designs the Phone’s Cases)
Price: $34.99
Mous is one of the few brands here that designs cases for the Duo as well, so the protector comes from a company already thinking about how the two halves meet. The Duo variant has to be picked from the device list on the page rather than arriving preselected, which is worth knowing before you click buy.
Two sheets at $34.99 is not cheap for tempered glass, and the case is thin: the price is buying Mous’s fit and tolerance rather than a material claim, because the page makes no drop or scratch figure for it.
6. ESR UltraFit Armorite 2-Pack (Best Mid-Range Pair)
Price: $18.99
Half the price of the Corning option and still an ESR sheet with the same style of installation tray. Two in the pack, which covers both panels of the foldable if you are the type to put one on each.
The material is ordinary tempered glass with no reinforcement, and nothing on the page claims otherwise. Buy this if the price is the deciding factor and accept that you are buying fit and convenience rather than a stated level of protection.
7. ESR UltraFit Armorite 3-Pack (Best Value 3-Pack)
Price: $21.99
Three sheets for $21.99 makes this the cheapest route to having a spare for both panels plus a replacement. It is the same tempered glass as the pick above, in a larger pack, for three dollars more.
That is the whole argument. If the plan is to put a protector on and leave it, spend the extra on the Corning sheet. If the plan involves a work bench, a dog or a child, three cheap sheets are the rational purchase.
8. ESR UltraFit Armorite Pro 2-Pack (Best for One Panel Covered)
Price: $29.99
The Corning glass without the third sheet, at $29.99. If you have decided the inner display is the one worth protecting and you want the same material as the pick at number one, this is the version that does not pay for a spare you will never use.
Note what ESR’s slugs do on this page: the page called 7x-tempered-glass is titled Armorite, and this one is filed under a handle about Corning while rendering a slightly different product line name. The prices and titles were read on the page rather than from the URL, which is the only reason the pairing is trustworthy.
The Verdict
Take the ESR UltraFit Armorite Pro 3-Pack if you want the strongest material claim available before launch day. Buy the ESR UltraFit Armorite 3-Pack at $21.99 if three cheap sheets is the sensible purchase for a phone that has not arrived yet. Pick the Spigen GLAS.tR EZ Fit Pro if you would rather buy one brand for the protector, the case and the lens.
The phone does not ship until 23 October and none of these brands publishes independent drop testing for a foldable protector, because there is no track record to test against. Buy on fit and price now, and judge the glass once the phone is in your hand.
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