When comparing Joico's 'Color Intensity' vs Overtone, the Slant community recommends Joico's 'Color Intensity' for most people. In the question“What are the best semi-permanent hair dyes for unnatural colors?” Joico's 'Color Intensity' is ranked 6th while Overtone is ranked 7th.
Specs
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Pros
Pro High end salon results
Pro Helps leave hair gorgeously conditioned + amps up shine
Contains the ultra nourishing Kukui Nut Oil.
Pro Consistency of the dye is easy to work with
Pro You can learn professional techniques from videos on their site
Pro Color stays for a long time
The color will stay lovely and vibrant for weeks on end.
Pro They make metallic colors as well
Pro 2O vibrant intermixable shades last 15 shampoos
When applied using their directions and using Joico's Color Endure or K-Pack Color Therapy shampoo as well as K-Pack Cuticle Sealer and finishing product INtesne Hydrator. You will absolutely see a feel a major difference in the health of your hair.
Pro High quality professional product
Pro Guaranteed healthier hair after every color application
Contains K-PAK’s powerful Quadramine Complex®.
Pro Vegan-friendly
Pro Smells great
Pro Non-damaging
It's a color-depositing conditioner, so no ammonia, peroxide, or anything else bad for your hair. It can even feel better after using it--like a moisture mask!
Cons
Con Fades so fast
Only after one wash green faded to blue.
Con Expensive
Con The "extreme" line will temporarily stain skin
When using extreme blue without gloves your hands can get a bit smurf-y for a couple of days. On the plus side, it stays in the hair well.