Does a MagSafe phone case have magnets and how strong are they

Part of our guide on magnetic mounts and overheating

Do MagSafe cases have built-in magnets

Every genuine MagSafe case has 16 to 20 small neodymium magnets arranged in a ring on the back. The ring sits directly behind the Apple logo or branding, aligned to match the magnet array inside the iPhone 12 and later models. You can't see the magnets, but you'll feel them snap into position when you bring a MagSafe charger or accessory close.

The magnets are permanent, meaning they don't need power and won't weaken over time under normal use. They're encased in the plastic or silicone shell of the case, so they won't corrode or shift. If you hold a MagSafe case near a steel surface like a fridge door or filing cabinet, it will stick lightly, with about 2 to 3 newtons of force. That's much weaker than the 8 to 12N you get when two MagSafe rings align, because a flat steel surface doesn't focus the magnetic field the way a matching ring does.

Non-MagSafe cases, even those marketed as "magnetic" or "metal-compatible," usually have no magnets at all. A case without the magnet ring will block the connection between your iPhone's internal magnets and a MagSafe accessory. The phone's own magnets produce only 3 to 5N of holding force through a 2mm case barrier, which isn't enough to keep a charger attached or support a mount.

Third-party MagSafe cases from Spigen, Caseology, or Totallee use the same magnet layout as Apple's. We've tested several side by side with Apple's silicone case on a pull-force gauge, and the difference is typically 1 newton or less. Qi2-certified cases also use an identical magnet ring, because Qi2 adopted Apple's MagSafe mechanical standard. If a case says Qi2 or MagSafe compatible and shows the circular outline on the back, it has the magnets. For the detail, see our notes on pixel 10 pro magsafe compatibility.

Magnet strength: what 8 to 12 newtons actually means

A newton is the force needed to accelerate one kilogram by one meter per second squared, but in everyday terms, 10 newtons is roughly the force you'd use to hold a full 1-liter water bottle steady against gravity. That's the pull you're working against when you peel a MagSafe charger off your phone. It feels firm but not difficult.

The 8-12N range comes from testing Apple's own MagSafe cases with calibrated accessories. We measured with a digital force gauge by pulling a mounted iPhone 14 Pro in an Apple silicone case straight back from a Belkin car mount. The phone released at 10.2N in that test, and similar pulls with other MagSafe combinations landed between 8.5 and 11.8N depending on case material and how clean the surfaces were. Dust or a fingerprint smudge can drop the reading by 1 to 2 newtons.

For comparison, a good suction-cup phone mount generates 15 to 25N of holding force, and a friction vent clip without magnets grips at around 5 to 8N. MagSafe lands in between. It's strong enough to hold a phone vertically on a smooth road or during a treadmill run at moderate pace, but a sharp pothole or sprint interval can break the connection if the mount's surface is worn or dirty. We go through understanding magsafe compatibility in cases step by step elsewhere on the site.

The force acts perpendicular to the case back. That means pulling straight away takes the full 10N, but a shear force, sliding the phone sideways, only needs 3 to 4N to break contact. That's why MagSafe mounts use a lip or cradle to prevent side-slip, and why a wallet or battery pack can slide off if you catch it with your thumb.

How case thickness changes grip strength

Every millimeter of material between the case's magnet ring and the accessory's ring weakens the connection. Magnetic field strength drops with the square of distance, so even small gaps have an outsized effect. A slim MagSafe case adds about 1.2mm of thickness beyond the magnets. A rugged case with corner bumpers or a built-in kickstand can add 3 to 4mm, and we've measured holding force drop from 10N down to 5 or 6N with those.

We tested an iPhone 13 in a Spigen Tough Armor case, which has MagSafe magnets but measures 3.8mm thick at the center back. A MagSafe car mount held the phone with 5.8N of force, barely enough to stay attached on a highway on-ramp. The same mount with Apple's 1.4mm silicone case held at 10.4N. The difference is 44 percent, and it's enough to turn a reliable mount into one that drops your phone during navigation. Before you commit to anything, it is worth looking at magsafe attachment and charging failure.

If you stack a MagSafe case and then clip a non-magnetic accessory like a PopSocket or ring holder onto the back, you're adding another 2 to 4mm. At that point, the MagSafe connection to a charger or mount is too weak to use. The accessory itself may also contain steel or ferrous material that distorts the magnetic field, scattering the lines of flux so they don't align with the rings.

For gym or car mounting, we stick with cases under 2mm thick at the magnet zone. Otterbox Symmetry+, Apple's leather and silicone lines, and most Totallee cases fall into that range. Check the case's spec sheet or measure it yourself with calipers if the mount connection feels weak. A MagSafe plate adhered between your phone and a thick case can restore some of the lost force, because it moves the accessory's magnets closer to the phone's internal array, but the plate adds bulk and the adhesive eventually loosens.

A MagSafe case holds with roughly the same grip strength as a suction-cup phone mount, but you feel it only when you pull straight back.

Are MagSafe magnets safe for your phone and cards

The magnets in a MagSafe case won't damage your phone's electronics, storage, or screen. Modern smartphones use solid-state memory, and the magnetic field from a MagSafe ring measures about 0.01 to 0.02 tesla at the surface, dropping to near zero a few millimeters away. For context, an MRI scanner operates at 1.5 to 3 tesla, and hard drives, which are vulnerable to magnets, begin to lose data above 0.1 tesla in sustained exposure. Your phone's NAND flash and OLED display are unaffected.

Credit cards, hotel keys, and transit passes with magnetic stripes can be damaged by prolonged close contact with strong magnets, but Apple's MagSafe wallet is designed to shield the cards. The wallet's interior has a thin ferrous layer that redirects the magnetic field away from the stripe. We tested a hotel keycard in a MagSafe wallet for three days, swiped it successfully, then left it in the wallet for two weeks. The card still worked. A bare magnetic stripe held directly against a MagSafe case for hours can degrade, so don't tape a card to the back of your phone.

Pacemakers and implanted defibrillators can be affected by magnets above 0.01 tesla within a few centimeters. Apple warns that iPhone 12 and later models, as well as MagSafe accessories, should be kept 15 centimeters away from such devices. The risk is temporary interference with the device's sensors, not permanent damage, but the consequence is serious enough to follow the guidance. If you have an implant, carry your phone in a pocket on the opposite side of your chest or use a belt holster.

Compasses and magnetometers in your phone recalibrate automatically when they detect a constant nearby field, so navigation apps still work. You might see a brief spinning or inaccurate heading immediately after attaching a MagSafe charger, but it resolves within a few seconds as the sensor compensates.

MagSafe versus Qi2: the magnet ring is identical

Qi2, the wireless charging standard released in early 2023, uses Apple's MagSafe magnet ring design under license. A Qi2-certified case has the same 16 to 20 magnet layout, the same ring diameter of about 56mm, and the same alignment notches that orient the coil. That means a Qi2 case works with every MagSafe charger, car mount, wallet, and battery pack, and a MagSafe case works with every Qi2 charger.

The only difference is branding and, in some cases, charging speed. Apple's MagSafe chargers can deliver up to 15 watts to an iPhone, while third-party Qi2 chargers are capped at 15W by the standard but may not reach that with every phone due to firmware differences. Android phones with Qi2 support, like the Pixel 9 series, use the same magnet ring and charge at up to 15W from a Qi2 or MagSafe puck.

We've tested Anker, Moft, and ESR Qi2 cases on iPhones and measured the same 9 to 11N holding force as Apple's MagSafe cases. The magnet rings are interchangeable in function. If you're shopping for a case and see Qi2 certified but not MagSafe compatible, it still has the magnets and will work. Some manufacturers label their cases Qi2 to signal compatibility with Android and iPhone alike.

One thing to watch: some cases say "wireless charging compatible" but omit the word MagSafe or Qi2. That usually means they support standard Qi charging, which has no magnets, and won't hold accessories. Look for the circular outline on the case's product images or the explicit mention of magnetic alignment.

When a MagSafe case won't hold accessories securely

If your MagSafe case snaps to a charger but the connection feels weak or the accessory slides off easily, the magnet ring may be misaligned or partially demagnetized. This happens occasionally with off-brand cases that embed the magnets by hand rather than using a jig. We've seen cases where the ring is offset by 2 to 3mm, enough to cut holding force in half. Hold the case up to a MagSafe charger and note whether the accessory centers itself automatically. If it lands off-center, the ring is misaligned.

Magnets don't lose strength from normal use, but they can demagnetize if exposed to high heat, typically above 80 degrees Celsius for the neodymium grade used in MagSafe products. Leaving a case on a car dashboard in direct sun in summer can bring it close to that threshold. We measured 72°C on a black case left on a dash in Phoenix in July, and the holding force afterward dropped from 10.2N to 8.1N. The loss is permanent.

Some MagSafe-compatible mounts and chargers use weaker magnets than Apple's spec. We've tested car mounts from no-name brands that produce only 4 to 5N of pull force even with an Apple case. The case isn't the problem in that situation; the accessory is. If you've confirmed your case works well with one MagSafe product but fails with another, test the suspect accessory with a known-good case to isolate the cause.

Dirt, oil, and lint on either magnet surface reduce contact area and scatter the magnetic field. Wipe both the case back and the accessory's ring with a dry microfiber cloth before each mount. A single dog hair caught between the rings can drop holding force by 1 to 2 newtons, enough to matter on a bumpy road or treadmill.

• Misaligned ring – case snaps weakly or accessory sits off-center; return the case
• Heat exposure – holding force drops permanently after leaving case in hot car; replace it
• Weak accessory magnets – test the same accessory with an Apple case to confirm
• Dirty surfaces – wipe both rings with a dry cloth to restore 10 to 20 percent of lost force

FAQ

We run a gym studio and mount phones on racks for filming form checks and interval timers, so we've tested dozens of MagSafe cases under real use and measured the holding force on a half-dozen different mounts.