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The INKEY List vs Principia

Rated by Lovi · Unbiased, science-based skincare AI trained on real user outcomes · How the Fit score works

The INKEY List and Principia are British and Brazilian skincare brands offering focused, ingredient-led products for various complexions. The INKEY List features moisturizers, serums, toners, and eye products built around glycerin, suiting sensitive and acne-prone skin best. Meanwhile, Principia is widely loved for its thoughtful cleansers and precise formulas that suit balanced to oily skin best. While both brands help maintain a healthy, balanced complexion, their specific product types, key ingredients, and ideal skin types differ.

The INKEY List is a British skincare brand founded in 2018 and owned by Brand Evangelists for Beauty Limited.

cosmeticsbusiness.comprnewswire.comtheinkeylist.comtracxn.com

This page compares some of the most popular The INKEY List and Principia products; for every product of both brands, with a fit score for your own skin, use the Lovi app.

Popular The INKEY List vs Principia products

Questions and answers

The INKEY List or Principia: which is better?

The INKEY List offers a much wider range of products that Lovi rates well across various skin types compared to Principia. Reviewers often mention its affordable serums and hydrating moisturizers, though some note packaging issues.

What is the difference between The INKEY List and Principia?

The INKEY List offers a wide variety of cleansers, serums, and moisturizers that fit sensitive skin and acne-prone skin well, whereas Principia features only a single cleanser on this page.

The INKEY List or Principia: which cleanser is better?

Both brands offer cleansers on this page, but The INKEY List features multiple options with high fit levels for various skin types, such as its Salicylic Acid Cleanser which rates High for combination, oily, and acne-prone skin. Meanwhile, Principia includes only one cleanser, the Gel de Limpeza GL-01, which receives lower average and caution ratings across similar skin types.

Which is more affordable, The INKEY List or Principia?

The INKEY List offers affordable options, with reviewers noting its moisturizers and serums as affordable, while Principia has no data on affordability on this page.

Which causes fewer breakouts, The INKEY List or Principia?

Reviewers note that the products on this page from The INKEY List sometimes lead to purging and breakouts, while there is no information about breakouts for Principia on this page.

When were The INKEY List and Principia each founded?

The INKEY List was founded in 2018 in the United Kingdom, and Principia was founded in 2020.

Which brand offers more products for dry skin on this page, The INKEY List or Principia?

The INKEY List offers multiple products for dry skin on this page, whereas Principia lists only one cleanser, which has a caution fit level for dry skin.

Do either The INKEY List or Principia products contain fragrance?

Every product on The INKEY List page lists no fragrance in its ingredients, and every product on the Principia page also lists no fragrance in its ingredients.

Research behind their key ingredients

Behind this comparison

Lovi compares products by their fit scores, calculated from the full ingredient list with brand-independent rules our dermatologists and cosmetic chemists build and review, and personalizes every pick with AI trained on the real results of millions of users. Lovi trains its fit score models on a proprietary dataset built from more than 10,000 expert-labeled products and more than 100,000 simulated examples, following an internally consistent methodology presented at Cosmoprof, AMWC, and Skin of Color Update.

  • Nadia Kapleva, MS

    Nadia Kapleva, MS

    Co-founder, Medical Director

    Cosmetic chemist, cosmetologist, aesthetic products developer

  • Alexey Shagraev, PhD

    Alexey Shagraev, PhD

    Co-founder, CEO and CTO

    PhD in computer science, 3x US patent holder, ex-Google, ex-Yandex

  • Dr. Sofía Perea Pérez, MD, MSc

    Dr. Sofía Perea Pérez, MD, MSc

    Medical Board

    Aesthetic medicine practitioner, MSc in Longevity and Anti-Aging Medicine

  • Aishani Shah, MD

    Aishani Shah, MD

    Medical Board

    Specialist dermatologist, MBBS, MD, IFAAD

  • Asya Zubkova, MS

    Asya Zubkova, MS

    Medical Board

    Cosmetic chemist, SCS, IFSCC member

  • Hanna Kurets, MD

    Hanna Kurets, MD

    Medical Board, Medical Advisor

    Dermatology MD

  • Elina Nazarenko, MD

    Elina Nazarenko, MD

    Medical Board

    Dermatology and diagnostic consultant

  • Victoria Derkova, MS

    Victoria Derkova, MS

    Medical Board

    Cosmetic chemist, cosmetic development technologist

How does it fit your skin?

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