Brand Comparison
Rationale vs COSRX
A head-to-head comparison of two popular K-beauty brands. Which one is right for your skin?
Our Pick
COSRX
Larger product range
Rationale
Rationale is the Australian luxury-skincare brand that took the country's brutal UV-exposure problem seriously enough to build an entire research practice around skin-genetics and photoprotection science. Founded in 1992 by Cosmetic Chemist Richard Parker, the brand's signature is the [Essential Six Collection](/selections/rationale-essential-six) — six numbered products (#1 The Serum through #6 The Rejuvenating Night Crème) that together form a complete daily ritual. Pricing sits firmly at the Australian-prestige tier (~AU$140-280 per product), justified by formulation rigor, proprietary Skin Identical technology (introduced in 2012), and 30+ years of in-house photoprotection research. Distributed through 15+ Rationale stores in Australia plus dermatology clinics, luxury hotels, and selective retail partners globally. The Australian answer to Sisley or Augustinus Bader — luxury-tier skincare with genuine scientific moat.
Pros
- ✓ 30+ years of focused photoprotection research grounded in Australia's specific solar-damage burden
- ✓ Essential Six Collection's six-numbered-products approach simplifies routine choice without sacrificing completeness
- ✓ proprietary Skin Identical technology (2012) has substantive formulation and IP backing
- ✓ tinted Brilliance Serum SPF50+ is a genuine category leader for tinted high-SPF formulations
- ✓ luxury-tier execution through 15+ own-brand stores in Australia plus international dermatology and hotel distribution
Cons
- ✗ luxury pricing (~AU$140-280 per product) puts the full Essential Six ritual out of reach for most consumers
- ✗ limited international retail presence — primarily Australia, with selective US/UK/Asia rollout
