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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

Prell — every product, every rater | Greenlens

P

Prell

8 products in the catalog

45Poor
avg. across 8 rated products · one axis, not the card composite: 8
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 Conditioner 4 Shampoo 4

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Best overall Worst overall Most contested A–Z

34
Prell
Classic Clean Shampoo (2019 formulation)
HorribleIngredient safety only
34
raters split 15–90
Data Robust · 15/15
6 raters · split 15–90 on ingredient safety
EU Harmonised Classification (CLP Annex VI)Government90
Greenlens Ingredient ScanIndependent15
Greenlens Precautionary ScreenIndependent42
Greenlens Tolerance ScreenIndependent25
ANSES Endocrine DisruptorsGovernment80
Health Canada Ingredient HotlistGovernment70

Shampoo, For All Hair Types (2018 formulation)

Prell

Shampoo, For All Hair Types (2018 formulation)

HorribleIngredient safety only

33

raters split 13–85

Data Robust · 14/14

7 raters · split 13–85 on ingredient safety

California Proposition 65Government65
Greenlens Ingredient ScanIndependent13
IARC MonographsGovernment82
Greenlens Precautionary ScreenIndependent25
Greenlens Tolerance ScreenIndependent25
ANSES Endocrine DisruptorsGovernment80
Health Canada Ingredient HotlistGovernment85

Shampoo Classic, All Hair Types, Adult

Prell

Shampoo Classic, All Hair Types, Adult

HorribleIngredient safety only

33

raters split 13–85

Data Robust · 14/14

7 raters · split 13–85 on ingredient safety

California Proposition 65Government65
Greenlens Precautionary ScreenIndependent25
IARC MonographsGovernment82
ANSES Endocrine DisruptorsGovernment80
Greenlens Ingredient ScanIndependent13
Greenlens Tolerance ScreenIndependent25
Health Canada Ingredient HotlistGovernment85

Prell

Classic Clean Shampoo

HorribleIngredient safety only

32

raters split 11–90

Data Robust · 13/13

6 raters · split 11–90 on ingredient safety

EU Harmonised Classification (CLP Annex VI)Government90
Greenlens Precautionary ScreenIndependent42
ANSES Endocrine DisruptorsGovernment80
Greenlens Ingredient ScanIndependent11
Greenlens Tolerance ScreenIndependent25
Health Canada Ingredient HotlistGovernment70