Brand Comparison

COSRX vs Isoi

A head-to-head comparison of two popular K-beauty brands. Which one is right for your skin?

Our Pick

COSRX

Higher editor rating (9 vs 8.6)

COSRX Isoi

Rating9/108.6/10

Price RangeBudget ($)Premium ($$$)

Founded20132007

OriginSeoul, South KoreaSouth Korea

Products311

Best ForOily, Combo, Acne-Prone, SensitiveCombo, Mature, Sensitive

PhilosophyMinimal, effective formulations at accessible prices. Every product built around one or two proven actives with short, transparent ingredient lists.Damask rose, deeply.

COSRX

The gateway brand for most people entering K-beauty, and for good reason. COSRX consistently delivers effective, no-frills products at prices that make most Western alternatives look overpriced. Their snail mucin line and BHA products are genuine category leaders. They rarely innovate, but they execute the basics exceptionally well.

Pros

✓ Outstanding value across the entire range
✓ Short, transparent ingredient lists
✓ Consistently effective formulations
✓ Widely available globally

Cons

✗ Packaging is utilitarian, not luxurious
✗ Rarely pushes boundaries with new ingredients
✗ Some products have a faint tea tree scent

Isoi

Isoi has been quietly excellent for nearly two decades, but 2025 is its breakout year. The Blemish Care Up Serum picked up multiple Hwahae nods, and dermatology-leaning K-beauty fans have been quietly recommending it for fading post-acne marks for years. Premium-leaning but worth it.

Pros