Comparison

Yuka vs Think Dirty: Which Product Scanner Is Better?

Two of the best-known product scanners compared fairly: how Yuka and Think Dirty score products, where each is strong, their shared blind spot, and where a personal-trigger tool fits in.

The question this page answers

Yuka and Think Dirty are two of the best-known product scanners, and people often want to know which is better. The honest answer is that they overlap but are not identical, and both share the same blind spot for sensitive skin. This page compares them fairly on coverage, how they score, and where each is genuinely strong, then explains the one question neither is built to answer and where a personal-trigger approach fits in.

How each one works

Yuka scans a barcode and scores food and cosmetics out of 100 from a very large database, and it is popular worldwide across several languages. It applies its own criteria for nutrition and ingredient hazard and returns one traffic-light-style number. Think Dirty scans a cosmetic’s barcode and rates it on a 1-to-10 “dirty meter”, folding health, allergen and sustainability concerns into one score, and it is well known in North American clean-beauty circles. Both are fundamentally score-based tools: they give a single universal verdict rather than a personal check. The main difference between them is breadth, Yuka covers food too, while Think Dirty stays within cosmetics.

A fair point-by-point comparison

Coverage. Yuka is broader, spanning food and cosmetics, working in multiple languages, and holding a very large, mature database. Think Dirty is narrower, focused purely on cosmetics, which suits clean-beauty shopping specifically.

How each judges a product. Yuka produces one score from its nutrition-and-additives criteria. Think Dirty blends several kinds of concern into its “dirty meter”. Both are easy to read, and both reflect the app’s own view rather than yours. Think Dirty’s clean-or-dirty framing is more explicitly value-laden, which some people like and others find subjective.

Personalisation. This is the shared blind spot. Both give a single universal verdict based on their own criteria, so neither answers the question that matters most for sensitive skin: does this contain my specific trigger? A green Yuka score or a low Think Dirty rating can still hide your personal allergen.

Cosmetic versus food. Yuka covers both; Think Dirty covers cosmetics only. If your triggers appear in food or medicines as well as skincare, Yuka reaches further, though still only as a general scorer.

Cost. Both have free versions with optional paid tiers that change over time. Check the current terms in each app.

Where each falls short. Neither can reflect your personal triggers, which is the core limit for sensitive skin. Yuka’s score is broad but generic; Think Dirty’s is cosmetics-only and its framing is subjective. Both are general tools, not personal safety checks.

Who each one suits

Yuka suits someone who wants a fast, general read across everything they buy, food and cosmetics alike, in a widely supported app. Think Dirty suits a cosmetics-focused shopper who likes the clean-beauty framing and wants a quick impression plus “cleaner”-rated alternatives. Neither is built for the specific job of checking a product against your own known triggers. If that is your need, a personal-list tool like ClearaScan is designed for it: you save the ingredients you react to once and it flags only your triggers when you scan, with a Reaction Journal for flare-ups, a shared Care Circle so family or carers can scan for you, and a Trusted Products list for items you have cleared. It is currently in early access.

An honest recommendation

For a general score, Yuka edges it on coverage and breadth, while Think Dirty suits cosmetics-focused, clean-beauty users who like its framing. But for your triggers specifically, a personal-list tool answers the question neither score does. The honest trade-offs are worth stating plainly: the scanners need no setup but give a one-size verdict that cannot know your triggers, whereas a personal list is tailored to you but depends on you building it and, in ClearaScan’s case, is still in early access with a smaller database. Many people keep a scanner for browsing and add a personal-list tool for the specific check. If you are trying to work out what flares your skin in the first place, none of these apps replaces advice from a GP or dermatologist, ideally with patch testing. (Disclosure: our editor co-founded ClearaScan, and we are not paid to mention the others.)

More comparisons

A General Score vs Your Personal Triggers (Food)

A universal health score answers 'is this generally good?'. Sensitive skin asks 'does this contain my trigger?'. A fair, plain-English look at why those are different questions and which approach to trust when.

Allergen-Card Apps vs ClearaScan: Which Helps When?

Allergen translation cards help you explain your needs when someone else is cooking; ClearaScan checks packaged products against your own list. A fair, plain-English comparison of two tools for two very different moments.

ClearaScan vs a Paper Avoid List (Food): An Honest Look

A written avoid list costs nothing and always works. A scannable app is faster and harder to fool. A fair, plain-English comparison of the two for managing food-and-skin triggers, with the trade-offs of each.

Clearya vs Yuka: Shopping Alerts vs Product Scores

Clearya flags concerning ingredients as you shop online; Yuka scores products you scan in-store. A fair, plain-English comparison of how the two differ, what each does well, and where both fall short for personal allergies.

The Sensitive Skin Ingredient Decoder

A free one-page guide to reading a skincare label fast: the irritants to watch, the fragrance loopholes, and what "fragrance-free" and "hypoallergenic" really mean.

No spam, just the guide and the occasional new article. Unsubscribe anytime.

Common questions

What is the difference between Yuka and Think Dirty?

Yuka scores both food and cosmetics out of 100 from a large database and is popular worldwide. Think Dirty rates cosmetics on a 1-to-10 'dirty meter' and is well known in North American clean-beauty circles. Both give a single universal verdict based on their own criteria, but Yuka is broader while Think Dirty is cosmetics-focused.

Which scanner has better coverage?

Yuka generally has the wider reach, covering food as well as cosmetics, working in several languages, and holding a very large database. Think Dirty is focused purely on cosmetics, so it is narrower but well suited to clean-beauty shopping.

Do either app account for my personal triggers?

No. Both give a single universal verdict based on their own criteria, so a green or low-dirt score can still hide the specific ingredient your skin reacts to. For a known personal trigger, a personal-list tool like ClearaScan is designed to flag it.

Are Yuka and Think Dirty free?

Both have free versions, and both have offered paid tiers for extra features. Pricing and features change over time, so it is worth checking each app's current terms before relying on it.

Should I use a scanner or a personal-list tool?

They do different jobs, so many people use both. A scanner gives a fast general read while browsing, and a personal-list tool checks a product against your own triggers when that specific answer matters. Neither replaces professional advice if you are trying to identify a reaction.

Written and reviewed by the Sensitive Skin Lab editorial team.

A note on this content. The Sensitive Skin Lab publishes general educational information, not medical advice. If you suspect you have an allergy or sensitivity, consult a qualified dermatologist or allergist. Product formulations and labels change without notice, so always check the ingredients on the product itself.