Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
Advertising Disclosure
10 Best s21 cases of 2025
Save up to 35% off
Best Choice1
OtterBoxOtterBox Defender Series Rugged Case for Samsung Galaxy S21 5G (NOT Plus/FE/Ultra) Case Only - Non-Retail Packaging - Black - with Microbial Defense
9.8Exceptional
-
-
Powerful technology We scan thousands of products and stores, analyzing reviews to find what matters most to users like you
Careful review Our team ensures quality, value, and fit based on real user feedback
Trusted insights AI and human analysis guide your decisions, reflecting real user prioritiesReal users impact
Thousands of users trust our site daily
- Based on millions of stores and reviews
- Shoppers influence our rankings
Analyzing top stores
Value for Money2
OtterBoxOtterBox Defender Series Rugged Case & Holster for Samsung Galaxy S21 5G (NOT Plus/FE/Ultra) Non-Retail Packaging - Black - with Microbial Defense
9.7Exceptional
-
3
![Spigen Liquid Air [Military Grade] Designed for Galaxy S21 Case (2021) - Matte Black](https://d1ttb1lnpo2lvz.cloudfront.net/7e0a079/loader.svg)
SpigenSpigen Liquid Air [Military Grade] Designed for Galaxy S21 Case (2021) - Matte Black
35% Off9.4Excellent
Our Rating
-
4
TeayohaTeayoha for Samsung Galaxy S21 Case,[Compatible with Magsafe] [Military Grade Drop Tested] Shockproof Magnetic Tough Rugged Protective Phone Case -6.2 inch (Black)
9.3Excellent
-
5
TENOCTENOC Phone Case for Samsung Galaxy S21 5G, Clear Case Non-Yellowing Protective Bumper Hard Back Cover
9.1Excellent
-
-
See Today’s Deals & Prices
6
Warsiafor Samsung Galaxy S21 Case, Galaxy S21 Case with HD Screen Protector [Military Grade Drop Tested] Heavy-Duty Tough Rugged Shockproof Protective Case for S21, Black
10% Off9.0Excellent
-
7
OtterBoxOtterBox Commuter Series Case for Galaxy S21 5G (ONLY - Does NOT FIT Plus or Ultra) - Black
8.8Very Good
Our Rating
-
8
OtterBoxOtterBox Commuter Series Case for Galaxy S21 Ultra 5G (ONLY - Does NOT FIT Non-Plus or Plus Sizes) - Black
Key specs-
compatible devices:Galaxy S21 Ultra 5G
-
form factor:Thin profile
-
additional features:Limited lifetime warranty
-
special features:Microbial growth blocker
-
product dimensions:N/A
8.7Very Good
Our Rating
-
9
M MAIKEZIProtective Case with Screen Protector for Samsung Galaxy S21 5G - Dual Layer, Magnetic Ring Holder, Kickstand, Drop Tested - Navy Blue
8.4Good
-
10
OtterBoxOtterBox Symmetry Series Clear Series Case for Galaxy S21 5G (ONLY - Does NOT FIT Plus or Ultra) - Stardust (Silver Flake/Clear)
8.2Good
-
