Olaplex vs Ouai: One Rebuilds Bonds, One Coats Them
Key Takeaways
- Olaplex No.3PLUS is $34 for 3.3 oz (Ulta, checked live August 2026) and lists bis-aminopropyl diglycol dimaleate fourth on its INCI; Ouai Bond Repair Balm ($50, 4.8 fl oz) contains no maleate bond-builder at all.
- Per ounce the treatments nearly tie, $10.30 vs $10.42, but Ouai's balm replaces your conditioner while Olaplex adds a pre-shampoo step to your routine.
- Olaplex is phasing out the original No.3 Hair Perfector in favor of No.3PLUS, which holds 4.6 stars across 349 Ulta reviews, with 95% of reviewers recommending it.
- Ouai's repair case rests on silk, hydrolyzed rice protein, and three silicones (amodimethicone, dimethicone, phenyl trimethicone); No.3PLUS is protein-free, which matters if protein overload is your problem.
- On shampoo, Ouai is the cheaper brand: $32 for 10 oz ($3.20/oz) against Olaplex No.4 at $34 for 8.5 oz ($4.00/oz), both checked August 2026.
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Buy Olaplex if your hair is bleached, colored, or heat-damaged and you want the strongest repair chemistry sold at retail. Buy Ouai if your hair is basically healthy and you want it softer and better-smelling by tonight. Olaplex No.3PLUS costs $34 for 3.3 oz; Ouai's Bond Repair Balm costs $50 for 4.8 fl oz (both checked live August 2026). Per ounce they nearly tie, so the decision comes down to what is actually in each bottle.
Two different definitions of "repair"
Olaplex built its business on one patented molecule: bis-aminopropyl diglycol dimaleate, which the brand says re-links the disulfide bonds that bleach and heat break. In No.3PLUS that ingredient sits fourth on the INCI list, ahead of the glycerin. The formula is protein-free and sulfate-free, and you apply it to damp hair for three minutes before you shampoo.
Ouai's Bond Repair Balm contains no maleate chemistry. Its first ten INCI entries are water, glycerin, cetearyl alcohol, behentrimonium chloride, amodimethicone, dimethicone, phenyl trimethicone, silk, sodium hyaluronate, and hydrolyzed rice protein. That is a conditioning formula: it coats and smooths the cuticle rather than working on internal bonds, and Ouai sells it as a conditioner replacement, left on for three minutes after shampooing. The brand's evidence comes in two parts, and they are often quoted as one. A 106-person consumer study found 90% said their hair felt healthier after the first use. The 54% less breakage figure is separate, from 2025 lab testing at TRI Princeton against a surfactant control.
Neither approach is fake. Coating damaged hair in silicones does reduce breakage, because most breakage happens during detangling. But only one of these products attempts internal repair, and it is not the one that costs $50.
The numbers
| Product | Price (checked Aug 2026) | Size | Per oz |
|---|---|---|---|
| Olaplex No.3PLUS | $34 at Ulta | 3.3 oz | $10.30 |
| Olaplex No.3PLUS large size | $68 at Ulta | 8.5 oz | $8.00 |
| Ouai Bond Repair Balm | $50 at theouai.com | 4.8 fl oz | $10.42 |
| Ouai Fine To Medium Hair Treatment Masque | $38 at theouai.com | 8 fl oz | $4.75 |
| Olaplex No.4 Bond Maintenance Shampoo | $34 at Ulta | 8.5 oz | $4.00 |
| Ouai Medium Hair Shampoo | $32 at theouai.com | 10 fl oz | $3.20 |
Read the routine cost, not just the sticker. The Ouai balm replaces a conditioner you were buying anyway, while No.3PLUS is an added step on top of your existing shampoo and conditioner. Factor that in and the gap between $34 and $50 narrows in practice.
What happened to the original No.3
Olaplex is retiring No.3 Hair Perfector and replacing it with No.3PLUS. Refinery29's March 2026 review ran under a headline calling the new version better than the original, and reported that the old formula stays on Olaplex's site only until existing stock sells out. Ulta shoppers rate No.3PLUS 4.6 stars across 349 reviews, with 95% saying they would recommend it. If the old formula was the one you were loyal to, our tested Olaplex No.3 dupes roundup compares cheaper bond-builders ingredient by ingredient.
Where each brand falls short
Olaplex first. No.3PLUS has little slip, so you still need shampoo and conditioner on top of it, and a three-bottle Olaplex wash day gets expensive fast. Cosmetic chemists have also spent a decade debating how much bond rebuilding actually happens at home-use concentrations, and Olaplex's headline claim for this formula, "360° cortex-to-cuticle repair," is marketing shorthand rather than a measurement you can check. If your hair is healthy, there is not much here to repair. This is medicine, not a treat.
Ouai's problem is the price of what the balm structurally is. At $10.42 an ounce for a silicone-and-protein conditioner, it costs more per ounce than Ouai's own Fine To Medium Hair Treatment Masque, which delivers hydrolyzed keratin, panthenol, and amodimethicone at $4.75 an ounce ($38 for 8 fl oz, checked August 2026). Amodimethicone can also build up on fine hair with repeated use. The "Bond Repair" name borrows the category's credibility, but no maleate or comparable bond-building molecule appears anywhere in the INCI.
One twist worth knowing: the protein caution runs opposite to the branding. Olaplex No.3PLUS is protein-free; Ouai's balm carries silk and hydrolyzed rice protein. Low-porosity hair that goes stiff from protein does better with Olaplex here, not the softer-sounding option.
The verdict
Buy Olaplex if you bleach, color, or heat-style regularly, you see mid-shaft breakage, and you want the one at-home treatment whose repair claim traces to a specific patented molecule. Take the 8.5 oz bottle at $68 if you know you will use it; $8.00 an ounce is the cheapest this maleate chemistry gets.
Buy Ouai if your hair is fundamentally fine and you want same-day softness and a perfume-grade scent, or you want repair-adjacent results without adding a step to your shower. Start with the $38 masque rather than the $50 balm; the ingredient lists overlap more than the prices suggest.
Frequently Asked Questions
Is Ouai Bond Repair Balm a dupe for Olaplex?
No. Olaplex No.3PLUS lists bis-aminopropyl diglycol dimaleate, its patented bond-building molecule, fourth on the INCI. Ouai's balm contains no maleate ingredient; its formula leads with three silicones (amodimethicone, dimethicone, phenyl trimethicone), silk, and hydrolyzed rice protein. They are different product categories wearing the same label.
What happened to the original Olaplex No.3?
Olaplex is replacing No.3 Hair Perfector with No.3PLUS Complete Repair Treatment, $34 for 3.3 oz at Ulta as of August 2026. Refinery29 reported in March 2026 that the original stays on Olaplex's site only until stock runs out. No.3PLUS keeps the maleate bond chemistry and is still protein-free and sulfate-free; Ulta reviewers rate it 4.6 stars across 349 reviews.
Which brand is cheaper, Olaplex or Ouai?
It depends on the shelf. On shampoo, Ouai wins: $32 for 10 oz ($3.20/oz) against Olaplex No.4 at $34 for 8.5 oz ($4.00/oz). On repair treatments they essentially tie per ounce, $10.30 for No.3PLUS versus $10.42 for the Bond Repair Balm, though the Ouai balm replaces your conditioner while Olaplex adds a step. All prices checked live August 2026.
Can I use Olaplex and Ouai together?
Yes, and the routine slots cleanly: Olaplex No.3PLUS on damp hair for three minutes before shampoo, then Ouai's Bond Repair Balm in place of conditioner afterward. Both rinse out, and the chemistries do not conflict. Watch fine hair for silicone buildup from the balm's amodimethicone if you use it every wash.
Is there a cheaper alternative to Olaplex?
Several bond-builders use maleate chemistry similar to Olaplex's for less money. Our Olaplex No.3 dupes guide compares them against the original formula ingredient by ingredient, including where each one genuinely matches and where it falls short.