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Side by side

Olaplex Nº.4CURL Bond Shaper Hydrating Curl Shampoo vs Olaplex Nº.4FINE Bond Maintenance Shampoo

71% function match · 7 of the 13 functions we compared match Formula overlap 30%. Olaplex Nº.4CURL Bond Shaper Hydrating Curl Shampoo and Olaplex Nº.4FINE Bond Maintenance Shampoo 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.

  • Nº.4CURL Bond Shaper Hydrating Curl Shampoo — colour-treated hair
  • Nº.4FINE Bond Maintenance Shampoo — colour-treated 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
Olaplex Nº.4CURL Bond Shaper Hydrating Curl Shampoo — 8.5 oz container Olaplex

Nº.4CURL Bond Shaper Hydrating Curl Shampoo

  • Shampoo
  • Salon
  • Sulfate-free
  • Silicone-free
Olaplex Nº.4FINE Bond Maintenance Shampoo — 8.45 oz container Olaplex

Nº.4FINE Bond Maintenance Shampoo

  • Shampoo
  • Prestige
  • Sulfate-free
  • Silicone-free
Price, size & price per ounce
$16 3.38 oz · $4.73/oz
$22.99 8.5 oz · $2.71/oz

Compared at different sizes — 8.5 oz against 3.38 oz. Per-ounce prices favour the larger bottle.

Value / price positioning
Same job for less elsewhere $$$$$ Salon tier · costs more than 94% of the 835 shampoos we’ve priced
Upper-mid price for a shampoo $$$$$ Prestige tier · costs more than 70% of the 835 shampoos we’ve priced
Best for hair types
Wavy–Coily The brand’s own claims name curly or textured hair. Your hair
All types Nothing in the formula or the claims narrows this to one pattern. Your hair
Moisture level Same
Moderate Humectants in the working part of the formula. Your hair
Moderate Humectants in the working part of the formula. Your hair
Cleansing strength Differs
Strong Removes oil, buildup, and most residue — a reset wash. Your hair
Moderate Removes oil and product; leaves some conditioning behind. Your hair
Slip / detangling Same
Moderate Conditioning agents are present, lower in the list. Your hair
Moderate Conditioning agents are present, lower in the list. Your hair
Weight on hair
Medium Middle of the range — noticeable on fine hair, light on coarse hair. Your hair
Light Water-first and light: unlikely to flatten fine hair. Your hair
Fragrance
Present Fragrance is listed; it sits below the working ingredients. Your hair
Present Fragrance is listed; it sits below the working ingredients. Your hair
Protein Same
Minor Protein appears, low enough to be a supporting ingredient. Your hair
Minor Protein appears, low enough to be a supporting ingredient. Your hair
Silicone / wax buildup Differs
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
None Nothing here needs a detergent wash to remove. Your hair
Clarifying wash needed
Moderate Your hair
Low Your hair
Expected lather Differs
High Thick foam that spreads quickly through the hair. Your hair
Moderate An ordinary shampoo lather. Your hair
Scalp active Same
None No over-the-counter scalp active. Your hair
None No over-the-counter scalp active. 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
  • Colour-treated hairthat fades faster in a sulfate wash
  • Fast-oiling scalpsthat need a real reset wash
  • Curly-method routinesno sulfates and no water-insoluble silicones
  • Hard waterand swimmers dealing with mineral deposit
  • Colour-treated hairthat fades faster in a sulfate wash
  • Curly-method routinesno sulfates and no water-insoluble silicones
  • Hard waterand swimmers dealing with mineral deposit
  • Fine hairthat flattens under most products
Why you might skip it
  • Scents bother youthis product carries a scent
  • Dry or damaged haira strong detergent system strips as it cleans
  • Stretching wash dayswaxes stay until a detergent wash removes them
  • Scents bother youthis product carries a scent
  • Dry or very humid airwhere heavy humectants work against you
  • Tight budgetsit sits in the upper price tiers
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
Shampoo
Shampoo
Line
Nº.4CURL/Nº.5CURL Bond Shaper
—
Where to buy
Brand website · Target
Manufacturer · Target
Free of
  • sulfate-free
  • silicone-free
  • curly-method compatible
  • sulfate-free
  • silicone-free
  • curly-method compatible
Vegan
—
Vegan · label states
Scent
Scented, not described
Fresh & airy

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

IngredientNº.4CURL Bond Shaper Hydrating Curl ShampooNº.4FINE Bond Maintenance Shampoo
Water
Neutral
#1Leading
#1Leading
Sodium Cocoyl Isethionate
Cleanses
#2Leading
#3Leading
Acrylates Copolymer
Holds
#7Supporting
#9Secondary
Propanediol
Moisturizes
#30Below the 1% line
#6Supporting
Glycerin
Moisturizes
#27Below the 1% line
#8Supporting
Fragrance
Fragrance
#50Below the 1% line
#14Below the 1% line
Hexyl Cinnamal
Fragrance
#61Below the 1% line
#48Below the 1% line
Limonene
Fragrance
#62Below the 1% line
#49Below the 1% line

What only one of them carries

Nº.4CURL Bond Shaper Hydrating Curl Shampoo

Nº.4FINE Bond Maintenance Shampoo

Full ingredient list — Nº.4CURL Bond Shaper Hydrating Curl Shampoo (62)
Full ingredient list — Nº.4FINE Bond Maintenance Shampoo (52)

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.

VerdictsNº.4CURL Bond Shaper Hydrating Curl ShampooNº.4FINE Bond Maintenance Shampoo
Supported
0
1
Partly supported
1
0
Stated by brand
3
2
Potential conflict
0
0

Nº.4CURL Bond Shaper Hydrating Curl Shampoo

  • Instantly strong hair and less breakage in one usePartly supportedSupports the surface, not a treatment.
  • Infinitely defined curlsStated by brandCan’t be confirmed from label.
  • 50% less frizz, even in high humidityStated by brandOnly the brand’s testing shows this.
  • 96% agree hair was easier to detangleStated by brandOnly the brand’s testing shows this.

Nº.4FINE Bond Maintenance Shampoo

  • CLINICALLY PROVEN TO VOLUMIZE AND STRENGTHEN FINE HAIRStated by brandOnly the brand’s testing shows this.
  • Doubles hair volume, adding body, bounce, and lift at the rootSupportedLeaves room for lift.
  • 60% reduction in breakage (as system with Nº.5FINE conditioner, tested on bleached hair)Stated by brandOnly the brand’s testing shows this.

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.

Both praised for shine and how it cleanses. Olaplex Nº.4CURL Bond Shaper Hydrating Curl Shampoo draws complaints about residue or cast; Olaplex Nº.4FINE Bond Maintenance Shampoo draws complaints about how it cleanses.

Nº.4CURL Bond Shaper Hydrating Curl Shampoo

Reviewers report clean springy shiny curls, softness, definition, and less frizz without stripping.

Bev and Ayesha, Ulta reviewers

A promotional reviewer reports soft hydrated defined curls without weight.

Debora, Ulta promotional review

A critical reviewer reports scalp buildup and straw-like ends; another reports a package arriving open.

Mackenzie and Lilia, Ulta reviewers

Nº.4FINE Bond Maintenance Shampoo

Reviewers frequently describe the scent as pleasant and the hair as feeling clean after rinsing

Fine-hair users report genuine added volume and fullness without the weigh-down common to richer shampoos

fine/thin hair users

Users recovering from damaged or over-processed hair report visible softness and shine improvement after weeks of consistent use

chemically damaged/over-processed hair

A minority of reviewers describe a thin, low-lather texture that requires more product or a second wash to feel fully clean

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.

$2.71/oz vs $4.73/oz — Olaplex Nº.4CURL Bond Shaper Hydrating Curl Shampoo costs about 1.7× more per ounce than Olaplex Nº.4FINE Bond Maintenance Shampoo.

$0.00/oz median $1.51/oz $17.29/oz $4.73/oz Nº.4CURL Bond Shaper Hydra $2.71/oz Nº.4FINE Bond Maintenance

Every mark sits on one distribution because these are compared against the same set: 835 shampoos with a computable unit price.

Value readNº.4CURL Bond Shaper Hydrating Curl ShampooNº.4FINE Bond Maintenance Shampoo
Label
Same job for less elsewhereYou are paying above the range for a formula close to several lower-priced options.
Upper-mid price for a shampooSits in the middle of the range for shampoos 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.

Nº.4CURL Bond Shaper Hydrating Curl Shampoo vs Cantu Weightless Smoothing Hair ShampooCantu · 97% function matchNº.4FINE Bond Maintenance Shampoo vs Sensories Smoother Passionflower & Aloe Smoothing ShampooRusk · 98% function matchNº.4CURL Bond Shaper Hydrating Curl Shampoo vs Caviar Anti-Aging Restructuring Bond Repair ShampooAlterna Haircare · 94% function matchNº.4FINE Bond Maintenance Shampoo vs Color Security ShampooColor Wow · 97% function matchNº.4CURL Bond Shaper Hydrating Curl Shampoo vs Smooth + Keratin & Jojoba Oil ShampooHask · 94% function matchNº.4FINE Bond Maintenance Shampoo vs Hooked 100% Clean Shampoo for Curly HairColor Wow · 97% function matchNº.4CURL Bond Shaper Hydrating Curl Shampoo vs Forming Pre-Styling ShampooAmerican Crew · 93% function matchNº.4FINE Bond Maintenance Shampoo vs ANGEL.WASHKevin Murphy · 95% function match

Nº.4CURL Bond Shaper Hydrating Curl Shampoo · Nº.4FINE Bond Maintenance Shampoo · All shampoos 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.
  • 12 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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