Syncly Social Index
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Hair
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Olaplex vs Kérastase on video, September 2026
Olaplex had more September videos than Kérastase (1,522 vs 919), but Kérastase ranked higher on the Syncly Social Index, 65.6 to 58.1. 76 videos named both. In the 40 we read, 14 praised both, 3 leaned Olaplex, 2 leaned Kérastase and 4 listed both as pricey picks with cheaper swaps.
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Side by side
Kérastase ranked 2nd in hair and Olaplex 5th. Kérastase led on untagged reach (100 vs 50): 34.8% of sampled Kérastase videos showed or said the brand without tagging it, vs 15.2% for Olaplex. It also led on momentum (44.4 vs 22.2; share up 16.2% from August vs 5.0%), high reach (77.8 vs 55.6; 4.9% vs 4.5% of videos over 100K views) and creator breadth (77.8 vs 66.7). Olaplex led on share of voice (88.9 vs 77.8) and sentiment (50 vs 0): 40.4% of its organic sampled videos were positive vs 29.5% for Kérastase. The Syncly Social Index measures attention and reaction in social video and does not test how well a product works.
Syncly Social Index metrics, September 2026. The higher value in each row is bold.
| Olaplex | Kérastase | |
|---|---|---|
| SSI score | 58.1 | 65.6 |
| Videos (month) | 1,522 | 919 |
| Change in share vs. last month | +5% | +16% |
| Untagged mentions | 15% | 35% |
| Positive (organic videos) | 40% | 30% |
| Videos with 100k+ views | 4.5% | 4.9% |
| Creator breadth | 95% | 95% |
When creators compare them
14 of 40 praised both, usually for different steps: paigetaylor.s calls her Olaplex and Kérastase oils favorites "of all time", and a Korean creator points very dry hair to Olaplex No.6 and lighter needs to Kérastase. Three leaned Olaplex: sofiahairhealth rated No.3 12/10 vs Kérastase Glaze Drops 8/10, and a Sephora advisor told a French-speaking shopper to skip Kérastase. Two leaned Kérastase: a dermatologist rated Bain Satin 9/10 vs Olaplex No.4 8/10, and danam_mua gave Elixir Ultime 100 vs Olaplex 9. Four videos, like this price comparison, list both as expensive picks with cheaper swaps.
Which one creators prefer in videos that mention both
Videos that compare them
Which one to choose
Choose Olaplex if you want what these creators use it for: No.3 for bond repair (leilapeacock_, karlacruzbeauty) and No.6 or No.7 for dry, damaged or chemically treated hair (shrikaped, Alex Gaboury). Choose Kérastase if you want a gloss or shine oil like Elixir Ultime or Gloss Absolu ("silk in a bottle", ashglowss) or Genesis for hair fall (karlacruzbeauty). Price comes up for both: four videos offer cheaper swaps, and one notes the Kérastase mask costs more.
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Frequently asked questions
Benchmark your brand against competitors
The Syncly Social Index scores brands from 0 to 100 using short-form video on TikTok, Instagram Reels and YouTube Shorts. It combines six signals: video share of voice (25%), untagged mentions (20%), momentum (15%), sentiment (15%), high-reach videos (15%) and creator breadth (10%). Each signal is scored relative to the other brands in the same category for the month. Sentiment and untagged figures come from a sample of videos; any claim about a specific video links to that video.