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Every public rating on one cosmetic, the places they disagree kept visible, and a single score whose weighting you control.

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The one rule

We never blend a score that hides who disagrees. Funding model travels with every rating. Weights are computed at read time and never stored.

Cosmetics only · lead with safetyProduct data from public sources incl. Open Beauty Facts & EWG Skin Deep · their ratings never scraped or shown

As an Amazon Associate, Greenlens earns from qualifying purchases. Affiliate income never changes a rating or ranking.Privacy Terms

One 'n Only — every product, every rater | Greenlens

Catalog/One 'n Only

O'

One 'n Only

40 products in the catalog

43Poor
avg. across 40 rated products · one axis, not the card composite: 40
products the raters split on

The average covers the ingredient-safety axis only, computed live from each product's raters — never a blended or stored brand score. Open a product to weight the axes yourself.

All products Hair Color And Bleaching 23 Hair Styling Aid 4 Hair Treatment Serum 6 Shampoo 4 Styling 26

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Best overall Worst overall Most contested A–Z

60
One 'n Only
Permanent Hair Color Powder Kit, Medium Brown
FairIngredient safety only
60
raters split 50–90
Data Robust · 12/12
5 raters · split 50–90 on ingredient safety
EU Harmonised Classification (CLP Annex VI)Government90
Greenlens Ingredient ScanIndependent50
Greenlens Precautionary ScreenIndependent55
Greenlens Tolerance ScreenIndependent70
Health Canada Ingredient HotlistGovernment85

Argan Oil Spray Treatment

One 'n Only

Argan Oil Spray Treatment

PoorIngredient safety only

54

raters split 42–100

Data Robust · 11/12

4 raters · split 42–100 on ingredient safety

ECHA SVHC Candidate ListGovernment60
Greenlens Ingredient ScanIndependent62
Greenlens Precautionary ScreenIndependent42
Greenlens Tolerance ScreenIndependent100

Argan Oil Permanent Color Cream, Medium Golden Blonde

One 'n Only

Argan Oil Permanent Color Cream, Medium Golden Blonde

HorribleIngredient safety only

25

raters split 5–80

Data Robust · 19/19

6 raters · split 5–80 on ingredient safety

EU Harmonised Classification (CLP Annex VI)Government80
Greenlens Ingredient ScanIndependent28
Greenlens Precautionary ScreenIndependent26
Greenlens Tolerance ScreenIndependent64
ANSES Endocrine DisruptorsGovernment5
Health Canada Ingredient HotlistGovernment70

Argan Oil Treatment

One 'n Only

Argan Oil Treatment

HorribleIngredient safety only

21

raters split 0–85

Data Robust · 8/8

5 raters · split 0–85 on ingredient safety

Greenlens Precautionary ScreenIndependent42
ECHA SVHC Candidate ListGovernment80
Greenlens Ingredient ScanIndependent0
Greenlens Tolerance ScreenIndependent0
Health Canada Ingredient HotlistGovernment85

One 'n Only

Argan Oil

HorribleIngredient safety only

21

raters split 0–85

Data Robust · 8/8

5 raters · split 0–85 on ingredient safety

Greenlens Ingredient ScanIndependent0
Greenlens Precautionary ScreenIndependent42
Greenlens Tolerance ScreenIndependent0
ECHA SVHC Candidate ListGovernment80
Health Canada Ingredient HotlistGovernment85

One 'n Only

Zero Fuss Coarse/frizzy Hair Primer

HorribleIngredient safety only

12

raters split 0–85

Data Robust · 25/25

6 raters · split 0–85 on ingredient safety

Greenlens Precautionary ScreenIndependent32
EU Harmonised Classification (CLP Annex VI)Government5
ANSES Endocrine DisruptorsGovernment0
Greenlens Ingredient ScanIndependent1
Greenlens Tolerance ScreenIndependent25
Health Canada Ingredient HotlistGovernment85