Compare SD Cards
UHS rating, speed class, capacity — every SD card lists these specs, but it's hard to tell what actually matters until you see two cards next to each other. Add up to three cards below to compare them side-by-side, swap any one out with the dropdown, or remove it with the × if you only need two. Your picks are saved to the URL, so you can bookmark or share the exact comparison.
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Frequently Asked Questions
What's the difference between UHS-I and UHS-II cards?
UHS-I cards have one row of pins and max out around 104 MB/s. UHS-II cards add a second row of pins that roughly doubles the speed. The catch: your device needs to support UHS-II to use the faster speeds. If you plug a UHS-II card into a UHS-I device, it'll just run at UHS-I speeds.
What do Speed Class ratings like C10, U3, and V30 actually do?
Speed Class ratings guarantee minimum write speeds so your video doesn't stutter or drop frames. C10 means at least 10 MB/s write speed (good for HD video). U3 guarantees 30 MB/s (better for 4K). V30 and higher are what you need for serious video work, professional cameras, or high bitrate footage. V60 and V90 are overkill for most people but necessary for cinema cameras.
Should I care about the A2 rating?
The A2 rating (App Performance Class) tells you how fast a card handles the quick random read/write tasks that apps and games need. A2 cards are noticeably snappier on phones, tablets, and gaming devices like the Steam Deck. If you're using your card mainly for photos or video, A2 doesn't matter much.
Why do cards have different read and write speeds?
Read speed is how fast files come off the card. Write speed is how fast data goes onto the card. For video recording, write speed is what matters because if your camera's bitrate exceeds the card's write speed, your recording will glitch or stop. For photo work, read speed matters more because you're usually just offloading files.
What's the endurance rating for?
Endurance tells you how much writing a card can handle before it wears out. Standard endurance cards are fine for normal photography and occasional video. High or Max Endurance cards are built to survive constant writing, which is why they're essential for dashcams and security cameras that record 24/7. Using a standard card in those situations will kill it fast.