Side by side
Design Essentials Moroccan Oil Thermal Serum vs Sebastian Dark Oil
92% function match · 11 of the 12 functions we compared match Formula overlap 65%. Design Essentials Moroccan Oil Thermal Serum and Sebastian Dark Oil share 4 ingredients among each other's most prominent.
Which of these fits your hair?
We check your pattern, moisture need, scalp, fragrance tolerance, weight sensitivity and more against each formula — and say which one lines up.
Your profile at a glance
- Your answers appear here
- Your answers appear here
- Your answers appear here
- Your answers appear here
When each one is the right call
What each formula is built for, from its own ingredient list.
- Moroccan Oil Thermal Serum — protein-sensitive hair
- Dark Oil — protein-sensitive hair
Side by side
Every trait, aligned
One row per trait, read from each product’s own ingredient list and record. A dash means we have not researched that field for that product — it is not a “no”.
- Protein-sensitive hairthat stiffens when protein is added
- Dull-looking haira recognised shine system is present
- Sun and colour fadea UV filter is in the list
- Aerosol avoidancea pump or tube, not a pressurised can
- Protein-sensitive hairthat stiffens when protein is added
- Dull-looking haira recognised shine system is present
- Humid climatesthe brand claims humidity resistance
- Very dry hairno fast-drying alcohol in the list
- Scents bother youthis product carries a scent
- Curly-method routinesthese silicones need a detergent to remove
- Very dry or damaged hairit contains fast-drying alcohol
- Scents bother youthis product carries a scent
- Curly-method routinesthese silicones need a detergent to remove
- Vegan and cruelty-freeour record does not support both claims here
More facts about each one
- sulfate-free
- protein-free
- sulfate-free
- protein-free
Facts as we recorded them. A dash means we have not researched that field for that product — it is not a "no".
The bottom line
The bottom line depends on your hair
Which of these two suits you is a question about your hair, not about them. The consultation answers it — and tells you what your routine needs around it.
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The detail behind the table
Where the readings above come from: the ingredient lists themselves, each brand’s claims checked against them, what owners report, and cost per ounce in context.
Shared and distinct ingredients
Shared and distinct ingredients
Computed from the ingredient lists as printed. "Shared" means both lists carry it; where it sits on each label is stated, because position is what tells you how much.
What both formulas carry
What only one of them carries
Moroccan Oil Thermal Serum
Full ingredient list — Moroccan Oil Thermal Serum (10)
-
1
Cyclopentasiloxane
- silicone
- emollient
-
2
Cyclotetrasiloxane
- silicone
- emollient
-
3
Dimethicone
- silicone
- emollient
- conditioning agent
-
4
Cyclohexasiloxane
- silicone
- emollient
-
5
Dimethiconol
- silicone
- emollient
-
6
C12-15 Alkyl Benzoate
- light ester
- emollient
- Below about this point, order stops being meaningful — these are typically used at 1% or less.
-
7
Fragrance
- fragrance
- declared fragrance
-
8
Argania Spinosa Kernel Oil
- oil
- emollient
-
9
Ethylhexyl Methoxycinnamate
- UV filter
-
10
Alcohol Denat.
- drying alcohol
- solvent
Full ingredient list — Dark Oil (13)
-
1
Cyclopentasiloxane
- silicone
- emollient
-
2
Dimethiconol
- silicone
- emollient
-
3
Isododecane
- solvent
- emollient
- Below about this point, order stops being meaningful — these are typically used at 1% or less.
-
4
Fragrance
- fragrance
- declared fragrance
-
5
Argania Spinosa Kernel Oil
- oil
- emollient
-
6
Ethylhexyl Methoxycinnamate
- UV filter
-
7
Hexyl Cinnamal
- fragrance
- named fragrance allergen
-
8
Vanillin
- fragrance
-
9
Coumarin
- fragrance
- named fragrance allergen
-
10
Citronellol
- fragrance
- named fragrance allergen
-
11
Linalool
- fragrance
- named fragrance allergen
-
12
Limonene
- fragrance
- named fragrance allergen
-
13
Fusanus Spicatus Wood Oil
- fragrance
- botanical extract
Claims check
What each brand says, against what each formula shows
Claims are quoted from each brand. We only mark one supported, partly supported, or conflicting when that product’s ingredient list actually speaks to it.
Moroccan Oil Thermal Serum
Lightweight heat protectant that locks moisture into hair when using hot styling tools
SupportedHelps hair feel hydrated.Smooths the hair shaft
SupportedSmoother strands, less frizz.Improves hair manageability
Partly supportedA little slip, not a lot.Eliminates static
Stated by brandMay help, but not a primary focus.Imparts a high gloss finish
SupportedReflects light for visible shine.Extends the beauty and wearability of weaves and extensions
Stated by brandCan’t be confirmed from label.
Dark Oil
No claims recorded for this product beyond the ones above.
Price check
Cost per ounce, in context
Cost per ounce against every product of this type we have priced, each at the size it is most often sold in. Value labels are computed from that percentile and from how many products that do the same job cost less; they are comparisons, not judgements about a brand.
$2.75/oz vs $4.59/oz — Sebastian Dark Oil costs about 1.7× more per ounce than Design Essentials Moroccan Oil Thermal Serum.
Moroccan Oil Thermal Serum
Against 77 serums with a computable unit price.
Dark Oil
Against 169 hair oils with a computable unit price.
Computed from cost per ounce against every product of this type we have priced, and from how many products that do the same job cost less. It is a comparison, not a judgement about the brand.
Compare with something else
Close formulas to each of these, as their own comparison pages.
Moroccan Oil Thermal Serum · Dark Oil · All serums in the library
How this page was made
- This page is assembled from the same researched records the individual product pages render: identity, each ingredient list as printed, each brand's own claims, dated price observations, and review themes written in our researchers' own words. Nothing on it is written per comparison.
- We do not rank these against each other. Which of them suits you depends on your hair, and that is what the consultation works out.
- The formula similarity percentage is a stored, precomputed number: position-weighted overlap of the two ingredient lists blended with agreement on the attributes we derive. It measures how alike two formulas are, not how well either works.
- The value band is a fixed label over two stored numbers: this product’s cost per ounce as a percentile of every product of this type we have priced, each at the size it is most often sold in, and how many products we score as doing the same job cost at least a quarter less per ounce.
- The "Is this right for you?" panel reads only your own consultation answers, and it applies exactly the filters our recommendation engine applies. It is computed when you load the page and is never stored on it.
- 5 sources were consulted across the products on this page.
- Ingredient order tells you relative amount only above roughly 1%. Prices are observations on the dates shown and change without notice. We do not sell these products and take no placement fees.
- This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.
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