Korean Sunscreen Dupes: Do the Cheap Ones Actually Match?
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Here’s the pitch you’ve seen a hundred times: this $12 Korean sunscreen is a dupe for the viral one, same thing for less. Sometimes that’s true. Often it isn’t. The trick is that a “dupe” only counts if the part that actually blocks UV, the filter list, lines up. The plant on the front (rice, centella, heartleaf, aloe) is cheap marketing and tells you almost nothing. So we did the boring, useful thing and put the ingredient lists side by side on INCIDecoder. Here’s what actually matches, and what just looks like it does.
TL;DR: Some korean sunscreen dupes are real and some are not, and the price tag won’t tell you which. Beauty of Joseon Relief Sun, SKIN1004 Water-Fit Sun Serum, and Goodal Heartleaf all use the exact same four modern UV filters, so they genuinely protect the same way and count as real alternatives to each other. But they aren’t identical: the hero ingredient and the texture differ, so they feel different on your face. Meanwhile a cheaper look-alike like COSRX Aloe uses a completely different, older filter set, so it’s a different product, not a dupe. Judge by the filters, not the price.
What makes a real Korean sunscreen dupe?
The filters, first and last. A sunscreen protects you through its UV filter system, not through the botanical it’s named after. Lab Muffin, a cosmetic chemist, puts the bar plainly: two sunscreens are the same formula when they use the same filters at the same concentrations, plus matching inactive ingredients. And even a real dupe made in a different factory won’t be a perfect copy, because suppliers differ [5].
That’s the test. If you want to know whether a cheaper sunscreen matches a popular one, you compare the filter lists near the top of each INCI list. If the filters line up, you have a genuine alternative. If they don’t, the shared aloe or centella on the label is a coincidence, not a match. We go deeper on how filters work in our Korean sunscreen guide.
The match: three loved sunscreens, one filter system
Start with the surprise. Three Korean daily sunscreens that get recommended constantly, from three different brands, use the identical four modern UV filters. Here’s what INCIDecoder shows, filter for filter:
| Beauty of Joseon Relief Sun | SKIN1004 Water-Fit Sun Serum | Goodal Heartleaf Sun Cream | |
|---|---|---|---|
| UV filters | Four: DHHB, Ethylhexyl Triazone, MBBT, Iscotrizinol [1] | The same four [2] | The same four [3] |
| Hero active | Rice extract 30% + niacinamide | Centella 9,800 ppm + niacinamide + hyaluronic acid | Heartleaf extract, no niacinamide |
| Texture | Hydrating cream | Watery serum | Moisturizing cream |
| UVA label | PA++++ | PA++++ | PA++++ |
Those four filters, in plain terms:
- Diethylamino Hydroxybenzoyl Hexyl Benzoate (DHHB). A modern UVA filter, prized for staying stable in the sun.
- Ethylhexyl Triazone. A strong, photostable UVB filter.
- Methylene Bis-Benzotriazolyl Tetramethylbutylphenol (MBBT). A broad-spectrum hybrid filter that covers UVB and UVA. It’s the one that can leave a slight cast on deeper skin, which we explain in our no-white-cast piece.
- Diethylhexyl Butamido Triazone (Iscotrizinol). Another photostable filter that adds UVB and some UVA coverage.
So on the metric that matters, protection, these three are genuinely interchangeable. If Relief Sun is sold out (it often is), or you just want a different texture, SKIN1004 Water-Fit and Goodal Heartleaf give you the same filter system under a different label. That’s a real dupe answer, and it’s the good news.
Same filters, still not the same product
Now the part the dupe lists skip. Matching filters do not make two sunscreens identical, and here the differences are easy to feel.
- Texture is not the same. Relief Sun and Goodal are creams. SKIN1004 Water-Fit is a watery serum. Reviewers describe the serum as lighter and faster to sink in, while the creams feel more cushiony and hydrating. Same protection, different feel, so oily and dry skin will not agree on a favorite.
- The hero active differs. Relief Sun leads with rice extract at 30%, SKIN1004 with centella at 9,800 ppm, Goodal with heartleaf. If you bought one for a specific soothing ingredient, the “dupe” may not carry it.
- Niacinamide is in two, not all three. Relief Sun and Water-Fit list niacinamide; Goodal’s version does not. A small thing, but exactly the kind of detail “they’re the same” glosses over.
Put simply: these are siblings, not clones. The protection is the same, the feel is different. So treat a filter match as “this will protect me the same way,” not “this will feel and behave exactly the same.” For a full label-by-label on two of these families, see our Isntree vs Round Lab comparison.
The cheaper look-alike that isn’t a dupe
Here’s where “cheap” gets you into trouble. Reach for a budget Korean sunscreen with a soothing plant on the front and it feels like it belongs in the same basket. It might not. Take COSRX Aloe Soothing Sun Cream, one of the more affordable options and an easy add-to-cart. On the shelf it looks like a peer of the three above. On INCIDecoder, the filter list is a different story [4]:
- It uses octinoxate (an older UVB filter), plus Tinosorb S, ensulizole, amiloxate, and a little titanium dioxide.
- That means it shares zero of the four filters in the Relief Sun family. The one modern filter it does carry, Tinosorb S (bemotrizinol), is the same one we covered as a newly approved US filter that Korea already had, but it’s a different filter from anything in the other three.
- On the label it’s rated PA+++, one step below the PA++++ of the others. That’s a stated difference in UVA claim, not our verdict.
None of that makes COSRX Aloe a bad sunscreen. It just makes it a different product wearing a similar vibe. If you bought it thinking it was a cheap stand-in for Relief Sun, the filters say otherwise. Same shelf, different tube. And if your worry is a different kind of cheap, whether a discounted bottle is even authentic, that’s a separate question we cover in is off-price Korean sunscreen legit.
So, do Korean sunscreen dupes actually match?
Sometimes, and the way to find out is always the same. When people ask us about korean sunscreen dupes, the answer is never in the price, it’s in the filter list. Here’s the two-minute check for any pair:
- Look up both products on INCIDecoder.
- Find the UV filters (they cluster near the top of the list) and compare them.
- If the filters match, you have a real alternative. Then glance at the texture and the hero active to see how the feel will differ.
- If the filters don’t match, it’s a different sunscreen, no matter how similar the front of the box looks.
By that test, SKIN1004 Water-Fit and Goodal Heartleaf are genuine alternatives to Beauty of Joseon Relief Sun. A cheaper aloe cream with a different filter set is not. The plant sells the product; the filters are the product.
Where to buy
If you want the two we could line up filter-for-filter with real listings: the popular one, Beauty of Joseon Relief Sun, and its filter-for-filter match, SKIN1004 Water-Fit Sun Serum. Pick by the texture you want, cushiony cream or watery serum, since the protection is the same.
FAQ
What makes a Korean sunscreen a real dupe?
The UV filters. A sunscreen protects you through its filter system, not its hero plant like rice, centella, or heartleaf. So a real dupe has to match on the filters first. Beauty of Joseon Relief Sun, SKIN1004 Water-Fit Sun Serum, and Goodal Heartleaf all use the same four modern filters, which is why they count as genuine alternatives to each other.
Is SKIN1004 Water-Fit a dupe for Beauty of Joseon Relief Sun?
On the filters, yes. Both use the same four modern UV filters (Diethylamino Hydroxybenzoyl Hexyl Benzoate, Ethylhexyl Triazone, Methylene Bis-Benzotriazolyl Tetramethylbutylphenol, and Diethylhexyl Butamido Triazone) plus niacinamide, per their INCIDecoder listings. But they are not identical: Relief Sun is a rice-based cream and Water-Fit is a lighter water-serum, so the finish differs even though the protection is the same.
Does a cheaper Korean sunscreen always match the popular one?
No. Price does not tell you if the filters match. A cheaper aloe sunscreen like COSRX Aloe Soothing Sun Cream uses a different, older filter set and carries a PA+++ rating rather than PA++++, so it is a different product, not a dupe. Always compare the filter lists, not the price or the plant on the front.
How do I check if two sunscreens are dupes myself?
Look up both on INCIDecoder and compare the UV filters near the top of each list. If the filters match, and ideally the base ingredients too, you have a real dupe. If the filters differ, it is a different sunscreen, even when the marketing and the hero plant look the same.
Sources
Ingredient lists (INCIDecoder, verified 2026-07-18):
[1] Beauty of Joseon Relief Sun: Rice + Probiotics SPF50+ PA++++ (filters: Diethylamino Hydroxybenzoyl Hexyl Benzoate, Ethylhexyl Triazone, Methylene Bis-Benzotriazolyl Tetramethylbutylphenol, Diethylhexyl Butamido Triazone; rice extract 30%, niacinamide): link
[2] SKIN1004 Madagascar Centella Hyalu-Cica Water-Fit Sun Serum SPF50+ PA++++ (same four filters; centella 9,800 ppm, niacinamide, hyaluronic acid): link
[3] Goodal Houttuynia Cordata Calming Moisture Sun Cream SPF50+ PA++++ (same four filters; heartleaf extract, no niacinamide): link
[4] COSRX Aloe Soothing Sun Cream SPF50 PA+++ (different filters: Ethylhexyl Methoxycinnamate, Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, Phenylbenzimidazole Sulfonic Acid, Isoamyl P-Methoxycinnamate, Titanium Dioxide; aloe 5,500 ppm): link
How to judge a dupe (cosmetic chemist):
[5] Lab Muffin Beauty Science, on when two sunscreens count as the same formula (same filters and concentrations, matching inactives; different factories won’t be identical): link
