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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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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

46Poor
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

64
One 'n Only
Permanent Powder Hair Color Kit, Chocolate Brown
FairIngredient safety only
64
raters split 55–90
Data Robust · 11/11
5 raters · split 55–90 on ingredient safety
Health Canada Ingredient HotlistGovernment85
Greenlens Tolerance ScreenIndependent76
Greenlens Precautionary ScreenIndependent55
EU Harmonised Classification (CLP Annex VI)Government90
Greenlens Ingredient ScanIndependent60

One 'n Only

Permanent Hair Color Powder Kit, Dark Golden Blonde

FairIngredient safety only

60

raters split 50–90

Data Robust · 12/12

5 raters · split 50–90 on ingredient safety

Health Canada Ingredient HotlistGovernment85
EU Harmonised Classification (CLP Annex VI)Government90
Greenlens Precautionary ScreenIndependent55
Greenlens Tolerance ScreenIndependent70
Greenlens Ingredient ScanIndependent50

Permanent Hair Color Kit Hair Color Powder, Black

One 'n Only

Permanent Hair Color Kit Hair Color Powder, Black

FairIngredient safety only

60

raters split 50–90

Data Robust · 11/11

5 raters · split 50–90 on ingredient safety

Health Canada Ingredient HotlistGovernment85
Greenlens Tolerance ScreenIndependent70
Greenlens Precautionary ScreenIndependent55
EU Harmonised Classification (CLP Annex VI)Government90
Greenlens Ingredient ScanIndependent50

One 'n Only

Argan Oil Permanent Color Cream, Medium Ash Blonde 7 A

FairIngredient safety only

57

raters split 42–90

Data Robust · 16/17

6 raters · split 42–90 on ingredient safety

Greenlens Ingredient ScanIndependent58
ANSES Endocrine DisruptorsGovernment80
Health Canada Ingredient HotlistGovernment85
Greenlens Precautionary ScreenIndependent42
EU Harmonised Classification (CLP Annex VI)Government90
Greenlens Tolerance ScreenIndependent82

Perfect Intensity Semi Permanent Color Cream, Neon Blue

One 'n Only

Perfect Intensity Semi Permanent Color Cream, Neon Blue

FairIngredient safety only

56

raters split 42–94

Data Robust · 15/15

4 raters · split 42–94 on ingredient safety

Health Canada Ingredient HotlistGovernment85
Greenlens Tolerance ScreenIndependent94
Greenlens Precautionary ScreenIndependent42
Greenlens Ingredient ScanIndependent62

Argan Oil Semi Permanent Color Cream, Pastel Lilac

One 'n Only

Argan Oil Semi Permanent Color Cream, Pastel Lilac

FairIngredient safety only

56

raters split 42–88

Data Robust · 14/14

4 raters · split 42–88 on ingredient safety

Health Canada Ingredient HotlistGovernment85
Greenlens Precautionary ScreenIndependent42
Greenlens Tolerance ScreenIndependent88
Greenlens Ingredient ScanIndependent62

Argan Oil Perfect Intensity Semi Permanent Color Cream, Pure Purple

One 'n Only

Argan Oil Perfect Intensity Semi Permanent Color Cream, Pure Purple

FairIngredient safety only

56

raters split 42–88

Data Robust · 14/14

4 raters · split 42–88 on ingredient safety

Health Canada Ingredient HotlistGovernment85
Greenlens Precautionary ScreenIndependent42
Greenlens Tolerance ScreenIndependent88
Greenlens Ingredient ScanIndependent62

Perfect Intensity Semi Permanent Color Cream, Pure Magenta

One 'n Only

Perfect Intensity Semi Permanent Color Cream, Pure Magenta

PoorIngredient safety only

54

raters split 42–85

Data Robust · 15/16

4 raters · split 42–85 on ingredient safety

Greenlens Ingredient ScanIndependent58
Health Canada Ingredient HotlistGovernment85
Greenlens Precautionary ScreenIndependent42
Greenlens Tolerance ScreenIndependent82

Semi Permanent Color Cream, Silver

One 'n Only

Semi Permanent Color Cream, Silver

PoorIngredient safety only

54

raters split 42–85

Data Robust · 15/15

4 raters · split 42–85 on ingredient safety

Health Canada Ingredient HotlistGovernment85
Greenlens Tolerance ScreenIndependent82
Greenlens Precautionary ScreenIndependent42
Greenlens Ingredient ScanIndependent58

One 'n Only

Argan Oil Permanent Hair Color Cream, Black 2 N

PoorIngredient safety only

50

raters split 38–80

Data Robust · 18/18

6 raters · split 38–80 on ingredient safety

Greenlens Ingredient ScanIndependent48
ANSES Endocrine DisruptorsGovernment60
Health Canada Ingredient HotlistGovernment70
Greenlens Precautionary ScreenIndependent38
EU Harmonised Classification (CLP Annex VI)Government80
Greenlens Tolerance ScreenIndependent76

Argan Oil Permanent Color Cream, Very Black 1 N

One 'n Only

Argan Oil Permanent Color Cream, Very Black 1 N

PoorIngredient safety only

50

raters split 38–80

Data Robust · 17/17

6 raters · split 38–80 on ingredient safety

Health Canada Ingredient HotlistGovernment70
Greenlens Tolerance ScreenIndependent76
Greenlens Precautionary ScreenIndependent38
EU Harmonised Classification (CLP Annex VI)Government80
Greenlens Ingredient ScanIndependent48
ANSES Endocrine DisruptorsGovernment60

Argan Oil Permanent Color Cream, Dark Natural Brown 3 N

One 'n Only

Argan Oil Permanent Color Cream, Dark Natural Brown 3 N

PoorIngredient safety only

47

raters split 38–80

Data Robust · 19/19

6 raters · split 38–80 on ingredient safety

Greenlens Ingredient ScanIndependent38
ANSES Endocrine DisruptorsGovernment40
Health Canada Ingredient HotlistGovernment70
Greenlens Precautionary ScreenIndependent38
EU Harmonised Classification (CLP Annex VI)Government80
Greenlens Tolerance ScreenIndependent70

One 'n Only

Permanent Argan Oil Color Cream, Light Red Brown 5 R

PoorIngredient safety only

42

raters split 25–90

Data Robust · 18/20

6 raters · split 25–90 on ingredient safety

Greenlens Ingredient ScanIndependent38
ANSES Endocrine DisruptorsGovernment25
Health Canada Ingredient HotlistGovernment85
Greenlens Precautionary ScreenIndependent42
EU Harmonised Classification (CLP Annex VI)Government90
Greenlens Tolerance ScreenIndependent70

Argan Oil Permanent Color Cream, Light Natural Brown 5 N

One 'n Only

Argan Oil Permanent Color Cream, Light Natural Brown 5 N

PoorIngredient safety only

40

raters split 25–80

Data Robust · 17/17

6 raters · split 25–80 on ingredient safety

Health Canada Ingredient HotlistGovernment70
Greenlens Tolerance ScreenIndependent76
Greenlens Precautionary ScreenIndependent26
EU Harmonised Classification (CLP Annex VI)Government80
Greenlens Ingredient ScanIndependent48
ANSES Endocrine DisruptorsGovernment25

One 'n Only

Argan Oil Permanent Hair Color Cream, Light Tangerine Brown 5 Rg

PoorIngredient safety only

40

raters split 25–90

Data Robust · 19/19

6 raters · split 25–90 on ingredient safety

Greenlens Ingredient ScanIndependent28
ANSES Endocrine DisruptorsGovernment25
Health Canada Ingredient HotlistGovernment85
Greenlens Precautionary ScreenIndependent42
EU Harmonised Classification (CLP Annex VI)Government90
Greenlens Tolerance ScreenIndependent64

Argan Oil Permanent Color Cream, Dark Cinnamon Blonde 6 CN

One 'n Only

Argan Oil Permanent Color Cream, Dark Cinnamon Blonde 6 CN

HorribleIngredient safety only

38

raters split 25–80

Data Robust · 18/18

6 raters · split 25–80 on ingredient safety

Health Canada Ingredient HotlistGovernment70
Greenlens Tolerance ScreenIndependent70
Greenlens Precautionary ScreenIndependent26
EU Harmonised Classification (CLP Annex VI)Government80
Greenlens Ingredient ScanIndependent38
ANSES Endocrine DisruptorsGovernment25

Argan Oil Permanent Color Cream, Medium Natural Brown 4 N

One 'n Only

Argan Oil Permanent Color Cream, Medium Natural Brown 4 N

HorribleIngredient safety only

38

raters split 25–80

Data Robust · 18/18

6 raters · split 25–80 on ingredient safety

Greenlens Ingredient ScanIndependent38
ANSES Endocrine DisruptorsGovernment25
Health Canada Ingredient HotlistGovernment70
Greenlens Precautionary ScreenIndependent26
EU Harmonised Classification (CLP Annex VI)Government80
Greenlens Tolerance ScreenIndependent70

One 'n Only

Permanent Color Cream, Medium Copper Brown 4 C

HorribleIngredient safety only

38

raters split 25–80

Data Robust · 18/18

6 raters · split 25–80 on ingredient safety

Health Canada Ingredient HotlistGovernment70
Greenlens Tolerance ScreenIndependent70
Greenlens Precautionary ScreenIndependent26
EU Harmonised Classification (CLP Annex VI)Government80
Greenlens Ingredient ScanIndependent38
ANSES Endocrine DisruptorsGovernment25

Permanent Haircolor Cream, Medium Cinnamom Brown 4 CN

One 'n Only

Permanent Haircolor Cream, Medium Cinnamom Brown 4 CN

HorribleIngredient safety only

37

raters split 25–80

Data Robust · 19/19

6 raters · split 25–80 on ingredient safety

Health Canada Ingredient HotlistGovernment70
Greenlens Tolerance ScreenIndependent64
Greenlens Precautionary ScreenIndependent26
EU Harmonised Classification (CLP Annex VI)Government80
Greenlens Ingredient ScanIndependent28
ANSES Endocrine DisruptorsGovernment25

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

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

Argan Oil Permanent Color Cream, 3CH Dark Chocolate Brown

One 'n Only

Argan Oil Permanent Color Cream, 3CH Dark Chocolate Brown

HorribleIngredient safety only

24

raters split 5–80

Data Robust · 20/20

6 raters · split 5–80 on ingredient safety

Greenlens Ingredient ScanIndependent18
ANSES Endocrine DisruptorsGovernment5
Health Canada Ingredient HotlistGovernment70
Greenlens Precautionary ScreenIndependent26
EU Harmonised Classification (CLP Annex VI)Government80
Greenlens Tolerance ScreenIndependent58

Argan Oil Permanent Color Cream, Rich Natural Medium Brown 4NN

One 'n Only

Argan Oil Permanent Color Cream, Rich Natural Medium Brown 4NN

HorribleIngredient safety only

24

raters split 5–80

Data Robust · 20/20

6 raters · split 5–80 on ingredient safety

Greenlens Ingredient ScanIndependent18
ANSES Endocrine DisruptorsGovernment5
Health Canada Ingredient HotlistGovernment70
Greenlens Precautionary ScreenIndependent26
EU Harmonised Classification (CLP Annex VI)Government80
Greenlens Tolerance ScreenIndependent58

Argan Oil Hair Color Cream Developer Volume 20

One 'n Only

Argan Oil Hair Color Cream Developer Volume 20

HorribleIngredient safety only

22

raters split 1–80

Data Robust · 16/16

5 raters · split 1–80 on ingredient safety

Health Canada Ingredient HotlistGovernment70
Greenlens Precautionary ScreenIndependent42
ANSES Endocrine DisruptorsGovernment80
Greenlens Tolerance ScreenIndependent25
Greenlens Ingredient ScanIndependent1