Which is better for covering gray?

Both claim 100% gray coverage. Olia's cream is non-drip and easier to keep in place on roots, while Feria relies on its conditioner to keep hair looking healthy after coloring.

Feria R57 Cherry Crush is an intense medium auburn, so it lands warmer and more cherry. Olia 6.65 Intense Red is a level 6 red that reads truer red and slightly cooler.

Is Olia gentler on the scalp?

Olia is ammonia-free and built on 60% oils, so it is usually the milder option. Feria is ammonia-based, which some shoppers find harsher.

Both are permanent, so the base color stays until it grows out. Reds fade fastest in both lines; Olia's oil base and Feria's conditioner affect feel more than fade time.

Is one worth paying more for?

No prices were given for either kit, so check current store prices on Deal.ai. If they are close, Olia's higher rating and ammonia-free formula justify a small premium.

Can I use either on previously colored hair?

Yes, both are permanent kits. Strand-test first, and expect a warmer result on hair that already has red or auburn in it.

L'Oreal Paris Feria Shimmering Permanent Hair Color R57 Cherry Crush vs Garnier Olia Long Lasting Permanent Hair Color Kit 6.65 Intense Red

Both are permanent red drugstore kits with 100% gray coverage, so the choice comes down to formula and finish. Olia 6.65 Intense Red is ammonia-free, oil-based and rated slightly higher (4.2 from 26,703 ratings vs 4.1 from 15,573), which makes it the safer pick for most shoppers. Feria R57 Cherry Crush is the bolder, more auburn-leaning red with a bonding conditioner, better if you want a warmer cherry tone. No prices were provided for either kit, so compare live store prices on Deal.ai before buying.

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