Yuka vs EWG: Which Product Safety App Should You Trust?

Yuka, founded in France in 2017 and now used by tens of millions of people worldwide, produces one number per product. For food, that number is weighted three ways: 60% nutritional quality, calculated using the Nutri-Score method (which rewards fiber, protein, and fruit/vegetable content while penalizing sugar, sodium, saturated fat, and calorie density); 30% additives, where each additive is assigned a risk tier based on Yuka's reading of EFSA and IARC assessments and independent studies; and a 10% bonus for certified-organic products.

Two mechanics matter more than the weights. First, a single additive Yuka classifies as "high risk" caps the entire product at 49/100, no matter how good the nutrition is. Second, the score bands are blunt: above 75 is "excellent," 50–75 "good," 20–50 "poor," below 20 "bad." For cosmetics, Yuka drops the nutrition component entirely and rates products on the risk levels of their individual ingredients.

Yuka's genuine strengths are independence — it takes no brand money and runs no ads, funding itself through an optional premium tier — and sheer pressure on manufacturers: several large retailers and food companies have reformulated products in response to Yuka user campaigns.

The main criticism: dietitians and toxicologists point out that Yuka's additive penalties ignore dose. An additive present at a fraction of its acceptable daily intake is penalized the same as one near the limit, and contested flags (MSG and carrageenan are the recurring examples, both considered safe at typical intakes by JECFA and major regulators) can drag an otherwise reasonable product into "bad" territory. Critics also argue the good/bad framing invites anxiety rather than nuance.

The Environmental Working Group's Skin Deep database takes the opposite approach: instead of one product number, it grades each ingredient on a 1–10 hazard scale (1–2 low hazard, 3–6 moderate, 7–10 high) by mapping it against toxicity classifications from bodies like IARC and the EU's cosmetic regulation annexes. Every score is paired with a data-availability rating from "none" to "robust" — an honest admission that for many cosmetic ingredients, the safety literature is thin.

Skin Deep covers personal care and cosmetics; EWG maintains separate databases for cleaning products (Guide to Healthy Cleaning) and food, plus the EWG Verified mark that manufacturers can license for products meeting its strictest criteria.

The main criticisms: like Yuka, Skin Deep is hazard-based rather than risk-based — a score reflects whether an ingredient could cause harm in some context, not whether it does at the concentration used in the product in front of you. Cosmetic chemists frequently note that concentration, formulation, and rinse-off versus leave-on exposure change real-world risk enormously. Separately, some observers see tension in EWG both rating products and collecting licensing fees from brands for the EWG Verified mark, though EWG states the programs are independent.

Search "yuka vs ewg" and you'll find confused shoppers holding a moisturizer that Yuka rates "excellent" and EWG rates a 6. Three structural reasons explain most of these conflicts:

• Different units of analysis. Yuka averages a whole product into one number; EWG surfaces the single worst ingredient. A formula with nineteen benign ingredients and one contested preservative looks fine on Yuka and alarming on EWG.
• Different evidence thresholds. The two organizations weigh the same studies differently. Fragrance, certain preservatives, and chemical UV filters are the most common points of divergence.
• Different scopes. Yuka's food score is mostly a nutrition score; EWG's food tools weight contaminants and processing. A sugary cereal with clean additives can score better on one than the other for reasons that have nothing to do with "safety" as most people mean it.

The honest takeaway is that neither number is the truth. Both are lenses — useful ones — over the same incomplete scientific record.

INCIDecoder doesn't score products at all. Paste or look up a cosmetic ingredient list and it explains what each INCI-named ingredient does — humectant, surfactant, preservative — with readable summaries of the evidence and lighthearted labels for standouts. For learning why an ingredient is in a formula rather than whether to fear it, it's the best free resource on the web, and a healthy counterweight to score-based apps. Its limits: cosmetics only, no food or supplements, no camera scanning, and no overall verdict when you just want a quick answer in a store aisle.

SafeShelf — this site — takes a different technical route: instead of matching a barcode against a database, it uses AI vision to read the label photo itself. That design choice creates three honest differentiators and one honest limitation.

• No database gap. Regional brands, pharmacy products, imports, and items launched last week can be analyzed the moment you photograph them — the situations where Yuka's scanner returns "product not found."
• Regulatory divergence flags. SafeShelf scores by the strictest major standard and tells you when an ingredient legal in your market is banned or warning-labeled elsewhere — for example, additives permitted by the FDA that the EU restricts.
• Personalization. With a free account and Pro plan, your allergies, medications, pregnancy status, and conditions are checked against every label — a drug–nutrient interaction warning is fundamentally different from a generic hazard score. None of the other three tools does this.

The limitation, stated plainly: SafeShelf is newer and smaller than Yuka or EWG, its analysis depends on label legibility, and AI reading can make mistakes that a curated database won't. We flag low-confidence results, but for high-stakes decisions you should cross-check any tool — including ours — against a professional.

• Fast grocery-aisle decisions on mainstream packaged food: Yuka.
• Researching a specific skincare ingredient in depth: EWG Skin Deep, read alongside INCIDecoder for the formulation context.
• Understanding what every ingredient in a cosmetic actually does: INCIDecoder.
• Products no database covers, supplements and household items, or analysis tailored to your allergies, medications, or pregnancy: SafeShelf.

Realistically, they complement each other. A hazard flag from any of these tools is a prompt to look closer — not a verdict.