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Side by side

Biolage Scalp Sync Universal Conditioner vs Nexxus Ultralight Smooth Conditioner Weightless

98% function match · 9 of the 10 functions we compared match Formula overlap 67%. Biolage Scalp Sync Universal Conditioner and Nexxus Ultralight Smooth Conditioner Weightless share 4 ingredients among each other's most prominent.

Based on your consultation

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.

  • Scalp Sync Universal Conditioner — protein-sensitive hair
  • Ultralight Smooth Conditioner Weightless — 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”.

Trait
Biolage Scalp Sync Universal Conditioner — 8 oz container Biolage

Scalp Sync Universal Conditioner

  • Conditioner
  • Salon
  • Sulfate-free
  • Protein-free
Nexxus Ultralight Smooth Conditioner Weightless — container, alternate view Nexxus

Ultralight Smooth Conditioner Weightless

  • Conditioner
  • Masstige
  • Sulfate-free
  • Protein-free
Price, size & price per ounce
about $27 8 oz · $3.38/oz
$16 13.5 oz · $1.26/oz
Value / price positioning
Same job for less elsewhere $$$$$ Salon tier · costs more than 78% of the 689 conditioners we’ve priced
Priced with its peers $$$$$ Masstige tier · costs less than 59% of the 689 conditioners we’ve priced
Best for hair types
All types Nothing in the formula or the claims narrows this to one pattern. Your hair
All types Nothing in the formula or the claims narrows this to one pattern. Your hair
Moisture level Same
High Humectants near the top — water-binding is a headline mechanism here. Your hair
High Humectants near the top — water-binding is a headline mechanism here. Your hair
Oils and butters Same
None No oils or butters in the list. Your hair
None No oils or butters in the list. Your hair
Slip / detangling Same
High Conditioning agents sit high in the list — this is a detangling formula. Your hair
High Conditioning agents sit high in the list — this is a detangling formula. Your hair
Weight on hair Same
Medium Middle of the range — noticeable on fine hair, light on coarse hair. Your hair
Medium Middle of the range — noticeable on fine hair, light on coarse hair. Your hair
Fragrance
Present Fragrance is listed; it sits below the working ingredients. Your hair
Prominent Fragrance sits in the first eight ingredients — a larger share of the formula. Your hair
Protein Same
None No protein or amino acids in the list. Your hair
None No protein or amino acids in the list. Your hair
Silicone / wax buildup Same
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
Clarifying wash needed
High Your hair
High Your hair
Hard-water defence Same
Chelators present Chelators are present — they bind hard-water and pool minerals. Your hair
Chelators present Chelators are present — they bind hard-water and pool minerals. Your hair
Formula completeness
out of 10
Complete for its job
out of 10
Complete for its job
Who should choose this
  • Protein-sensitive hairthat stiffens when protein is added
  • Maximum slipfor hair that tangles the moment it is wet
  • Dry, thirsty hairhumectants and emollients both sit up front
  • Cuticle-smoothing pHa pH adjuster brings it to the acidic range hair prefers
  • Protein-sensitive hairthat stiffens when protein is added
  • Maximum slipfor hair that tangles the moment it is wet
  • Dry, thirsty hairhumectants and emollients both sit up front
  • Very dry hairno fast-drying alcohol in the list
Why you might skip it
  • 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
  • Hair that needs proteinthere is none in this list
from the formula stated by the brand reported by reviewers Scale: 1 dot low · 5 dots high, within this product type.
More facts about each one
Type
Conditionercream
Conditioner
Where to buy
Grocery / mass · Salons
Grocery / mass
Free of
  • sulfate-free
  • protein-free
  • sulfate-free
  • protein-free
Scent
Scented, not described
Scented, not described
How often
every wash
—

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.

Take the consultation

$49.00 once, for your consultation and hair profile. No subscription, no required purchases.

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

IngredientScalp Sync Universal ConditionerUltralight Smooth Conditioner Weightless
Water
Neutral
#1Leading
#1Leading
Cetearyl Alcohol
Softens
#2Leading
#2Leading
Behentrimonium Chloride
Detangles
#3Leading
#6Below the 1% line
Dimethicone
Buildup
#7Supporting
#3Leading
Amodimethicone
Buildup
#8Supporting
#10Below the 1% line
Fragrance
Fragrance
#13Below the 1% line
#7Below the 1% line
Limonene
Fragrance
#20Below the 1% line
#22Below the 1% line
Linalool
Fragrance
#30Below the 1% line
#23Below the 1% line

What only one of them carries

Scalp Sync Universal Conditioner

Ultralight Smooth Conditioner Weightless

Full ingredient list — Scalp Sync Universal Conditioner (41)
Full ingredient list — Ultralight Smooth Conditioner Weightless (23)

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.

VerdictsScalp Sync Universal ConditionerUltralight Smooth Conditioner Weightless
Supported
3
3
Partly supported
0
0
Stated by brand
3
2
Potential conflict
0
0

Scalp Sync Universal Conditioner

  • Nourishes and conditions hair from root to tipSupportedHelps hair feel hydrated.
  • Promotes healthy scalp by reducing irritation and itchinessStated by brandCan’t be confirmed from label.
  • Can be used as a treatment for dry scalp with intense hydrationSupportedHelps hair feel hydrated.
  • Prevents dryness and tightness; leaves scalp soothed and refreshedStated by brandDepends on your scalp.
  • Suitable for all hair types, including color-treated hairSupportedLess fade per wash.
  • NATRUE CertifiedStated by brandCan’t be confirmed from label.

Ultralight Smooth Conditioner Weightless

  • 72H Frizz Protection: blocks out up to 98% of humidityStated by brandOnly the brand’s testing shows this.
  • 9.0% Frizz Deflector Technology with Biomimetic 18-MEAStated by brandOnly the brand’s testing shows this.
  • Weightless shield + ultra-smooth finish without heavinessSupportedSmoother strands, less frizz.
  • Instant shine + hydration without weigh-downSupportedHelps hair feel hydrated.
  • Sulfate-free and silicone-free formulaSupportedGentler on colour and coils.

What owners say

What people report

Recurring themes our researchers wrote in their own words from sourced reviews. We do not store or scrape star ratings, and we never balance one product’s themes against another’s by inventing them.

Biolage Scalp Sync Universal Conditioner draws complaints about the packaging; Nexxus Ultralight Smooth Conditioner Weightless draws complaints about weight and the scent.

Scalp Sync Universal Conditioner

Reviewers with sensitive or itchy scalps report the conditioner reduces dryness, itchiness and helps the scalp feel calmer.

reviewers with scalp irritation/dandruff concerns

Reviewers, including those with fine hair, say the conditioner feels lightweight and does not weigh hair down.

fine-hair reviewers

A recurring complaint is that the bottle's squeeze packaging is difficult to dispense from.

general reviewers

Ultralight Smooth Conditioner Weightless

Several reviewers say the conditioner leaves every strand feeling separated, light, and smooth rather than weighed down.

general users, including fine and color-treated hair

Some reviewers find the fragrance overwhelmingly strong, describing it as headache-inducing rather than pleasant.

fragrance-sensitive reviewers

A recurring complaint is that the product does not control frizz and can leave hair feeling poofy, straw-like, or greasy instead.

general users with frizz-prone hair

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.

$1.26/oz vs $3.38/oz — Biolage Scalp Sync Universal Conditioner costs about 2.7× more per ounce than Nexxus Ultralight Smooth Conditioner Weightless.

$0.09/oz median $1.60/oz $56.25/oz $3.38/oz Scalp Sync Universal Condi $1.26/oz Ultralight Smooth Conditio

Every mark sits on one distribution because these are compared against the same set: 689 conditioners with a computable unit price.

Value readScalp Sync Universal ConditionerUltralight Smooth Conditioner Weightless
Label
Same job for less elsewhereYou are paying above the range for a formula close to several lower-priced options.
Priced with its peersSits in the middle of the range for conditioners per ounce.

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.

Scalp Sync Universal Conditioner vs Instacure Build-A-Bond Mighty Care Conditioner for Very Damaged HairMatrix · 100% function matchUltralight Smooth Conditioner Weightless vs Aveeno Apple Cider Vinegar Blend Clarify & Shine ConditionerAveeno · 100% function matchScalp Sync Universal Conditioner vs Curls Rock Hydrating Conditioner for Juicy Curls and WavesBed Head · 100% function matchUltralight Smooth Conditioner Weightless vs Curls Rock Hydrating Conditioner for Juicy Curls and WavesBed Head · 98% function matchScalp Sync Universal Conditioner vs Resurrection Repair ConditionerTIGI Bed Head · 100% function matchUltralight Smooth Conditioner Weightless vs Resurrection Repair ConditionerTIGI Bed Head · 98% function matchScalp Sync Universal Conditioner vs Pro-V Curl Perfection ConditionerPantene · 100% function matchUltralight Smooth Conditioner Weightless vs Instacure Build-A-Bond Mighty Care Conditioner for Very Damaged HairMatrix · 98% function match

Scalp Sync Universal Conditioner · Ultralight Smooth Conditioner Weightless · All conditioners 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.
  • 6 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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