No, your Galaxy S21 case won't fit the OnePlus 13
The Galaxy S21 (151.7×71.2mm) and OnePlus 13 (162.9×76.5mm) differ too much for cases to be compatible.
Does a Galaxy S21 Case Fit OnePlus 13?
Last verified: March 2026
No, a Galaxy S21 case will not fit the OnePlus 13. The phones have different dimensions that make cases incompatible.
Your Galaxy S21 case will NOT fit the OnePlus 13. Here's why:
- •Camera module layout is different — cutout won't align
| Spec | Galaxy S21 | OnePlus 13 | Diff |
|---|---|---|---|
| Height | 151.7mm | 162.9mm | OnePlus 13 +11.2mm |
| Width | 71.2mm | 76.5mm | OnePlus 13 +5.3mm |
| Thickness | 7.9mm | 8.5mm | OnePlus 13 +0.6mm |
| Camera Layout | vertical-triple | circular-triple | Different |
| Port | usb-c | usb-c | Same |
Button & Port Alignment
- •New phone has alert slider — old case has no cutout for it
Since your Galaxy S21 case won't work with the OnePlus 13, here are the highest-rated cases that will:
Ringke
Ringke Fusion-X MagSafe for OnePlus 13
$23.99
As an Amazon Associate, WillItSnap earns from qualifying purchases. This doesn't affect our compatibility data.
Get alerts when we add more phones
Size Comparison
Wireless Charging & MagSafe
Wireless chargers work with both phones, but magnetic snap varies.
- Both devices support wireless charging. Standard Qi/Qi2 chargers work with either phone.
Galaxy S21
Qi only
15W max
OnePlus 13
Qi only
15W max
MagSafe cases are NOT cross-compatible between these devices — the case body is shaped to each phone, even though the internal magnet ring may be the same.
Related Guides
Related Compatibility Checks
Frequently Asked Questions
Are Galaxy S21 and OnePlus 13 the same size?
Galaxy S21 measures 151.7×71.2×7.9mm while OnePlus 13 measures 162.9×76.5×8.5mm. They are different sizes.
Can I use a Galaxy S21 screen protector on OnePlus 13?
Screen sizes differ (6.2" vs 6.82") — protector won't fit.
What's different between Galaxy S21 and OnePlus 13 dimensions?
The height differs by 11.2mm, the width by 5.3mm, and thickness by 0.6mm. The camera module layout is also different.
Do I need a new case for OnePlus 13?
Yes, you'll need a new case. The OnePlus 13 has different dimensions than the Galaxy S21, so cases are not interchangeable.
Will Galaxy S21 accessories work with OnePlus 13?
Chargers and cables are compatible since both phones use the same usb-c port. Both support wireless charging, so wireless chargers work with either phone. Cases and screen protectors depend on exact dimensions — check our compatibility results above.
Want to check another phone?
← Back to the compatibility checker