Hair Feel & Finish – 8.6/10

Olaplex No. 4P Blonde Enhancer Purple Toning Shampoo earns a strong score for how hair feels after rinsing, especially on lightened lengths that need slip. The bond-building ingredient and humectants help offset the dryness many purple shampoos can cause, so hair tends to feel smoother and less straw-like after toning.

The trade-off is that the cleansing system can read a bit clarifying on very dry, curly, or fragile hair if you use it too often. This matters most if your ends are porous or you already rotate in a detox shampoo, since you may prefer shorter contact time and a richer conditioner afterward.

Scent & Sensory Experience – 7.8/10

The scent and lather experience are polished for a toning shampoo, with a clean, salon-leaning fragrance and a rich foam that spreads easily. That texture helps distribute pigment evenly, which can make toning feel more controlled from roots to ends.

If you are fragrance-sensitive, the scent can be a deciding factor, since it is not fragrance-free and may linger on damp hair. Highly porous sections can also pick up pigment faster, so the sensory upside comes with a need to rinse hands and surfaces promptly if staining is a concern.

Scalp Comfort & Cleanliness – 8.2/10

For scalp comfort and cleanliness, it strikes a useful middle ground between gentle daily shampoos and harsher toners. It lathers quickly, rinses clean, and removes oil and styling residue without relying on sulfates, which helps many color-treated routines stay consistent.

The main trade-off is that some scalps may find the surfactant blend a touch strong if used multiple washes in a row, especially in dry climates or during winter. If you are prone to tightness or flaking, spacing it out to weekly use and alternating with a milder shampoo can keep toning benefits without stressing the scalp barrier.

Hair-Type Compatibility – 8.3/10

Hair-type compatibility is best for blondes and grays who want toning plus a more conditioned finish than many pigment-heavy formulas. It works well on highlighted and bleached hair when you tailor the leave-on time, and it is color safe for ongoing use in a maintenance routine.

Where it may fall short is for shoppers who need the fastest, most aggressive brass knockdown in a single wash, or for very coarse curls that prefer creamier, oilier cleansers. If your hair is extremely porous, keeping contact time closer to one minute and following with a mask can help avoid uneven toning at the ends.

Value For Money – 7.7/10

Value for money is solid if you want one product that tones and supports a healthier feel on compromised blonde hair. The formula is concentrated, so a little goes a long way for many users, and the bond-building positioning can reduce the need for a separate toning step in your routine.

The trade-off is the price tier compared with drugstore purple shampoos, and not everyone needs the extra repair angle. This matters most if you tone frequently or maintain multiple blondes in the household, where a budget option or a larger size may stretch further depending on how often you wash and how long you leave it on.

How we score performance: Scores reflect an editorial evaluation of verified label details, formulation choices, usability, and category trade-offs. 5 is average, 7-8 is strong with clear trade-offs, and 9-10 is exceptional.