This is the English edition of a review from my Japanese YouTube channel, iestaLife. I review gadgets from my home studio in Japan, so product links go to Amazon Japan.
CASEKOO provided these cases for review. They had no say over what I wrote.
Quick take
CASEKOO's OISafe series for the iPhone 17 and iPhone 17 Pro Max shares one design across all colors: raised edges around the screen, a full camera guard, an open Camera Control cutout and a strap hole. The color you pick still matters. The flat-backed Matte Black and Clear versions held a MagSafe power bank far more firmly than the textured colors, and Matte Black did not pick up a single fingerprint.
What I tested
- Eight OISafe cases: Clear, Ink (sumi-iro), Deep Blue and Matte Black for the iPhone 17; Purple, Ink, Deep Blue and Matte Black for the iPhone 17 Pro Max
- The iPhone 17 version listed at ¥4,999, selling for ¥4,399 at the time of recording
- Weight against Apple's own cases, MagSafe ring and power bank grip, and fingerprints
What I found
- Magnets are adequate, not extreme: a dual-sided MagSafe ring stays on a car mount rather than the case when pulled off.
- Power bank grip depends on the back: on Matte Black and Clear, a MagSafe battery with a ring attached on top still did not fall. The textured colors let it shift a little, though it never dropped.
- Camera protection: on the 17 Pro Max the case covers the area between the sensors and the LED, so I would skip a separate lens guard.
- Battery care: CASEKOO says the case is designed to reduce stress on the battery during wireless charging. I could not verify how it works.
| Model | Case | Weight (measured) |
|---|---|---|
| iPhone 17 | Apple Clear Case | 30.7 g |
| iPhone 17 | OISafe Clear | 30.8 g |
| iPhone 17 | OISafe Ink | 33.0 g |
| iPhone 17 | OISafe Deep Blue | 32.6 g |
| iPhone 17 | OISafe Matte Black | 31.8 g |
| iPhone 17 Pro Max | Apple TechWoven Case | 34.7 g |
| iPhone 17 Pro Max | OISafe Purple | 37.7 g |
| iPhone 17 Pro Max | OISafe Ink | 37.8 g |
| iPhone 17 Pro Max | OISafe Deep Blue | 37.7 g |
| iPhone 17 Pro Max | OISafe Matte Black | 36.8 g |
Who it is for
- People who carry a MagSafe power bank on the phone: choose Matte Black or Clear
- Anyone bothered by fingerprints: Matte Black
- Clear for showing off the iPhone color; Deep Blue, Purple or Ink for a subtle pattern
- If you want a built-in ring stand, CASEKOO's stand case does more but weighed 56.2 g, about 20 g heavier
The video is in Japanese. The weight test starts around 9:53, and the power bank grip test around 18:18.
Limitations
These are first impressions over a short period with review samples. I did not drop-test the cases or measure magnetic force with instruments. When I filmed, only the iPhone 17 version had an Amazon listing, so check that the listing matches your model.
Products
CASEKOO OISafe series iPhone case: on Amazon Japan
The Amazon Japan links above are affiliate links. As an Amazon Associate, I earn from qualifying purchases. Check the listing for the exact model, current price and shipping availability in your region.
More reviews in English
All Cases (56) →Browse all English reviews →
This review is also available in Japanese.