#42999B
Closest named color: Sea (#3C9992). oklch(63.1% 0.083 197.3), rgb(66, 153, 155).
Aa
Black text reads best on this color (6.26:1).
About this color
#42999B is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 63%, its chroma 0.083 and its hue 197°. Its hue sits on the cool side of the wheel. The nearest named color is Sea (#3C9992), ΔE 0.015 away. Black text reads best on it, at 6.26:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Sea (#3C9992) |
| Black text | 6.26:1 |
| White text | 3.35:1 |
Values
| HEX | #42999B |
| RGB | rgb(66, 153, 155) |
| HSL | hsl(181, 40%, 43%) |
| OKLCH | oklch(63.1% 0.083 197.3) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #42999B | 3.35:1 | AA large text | Lc -66.2 | Content text, not long reading |
| Black text on #42999B | 6.26:1 | AA | Lc 43.3 | Non-text elements, placeholder text |
| #42999B text on white | 3.35:1 | AA large text | Lc 60.8 | Content text, not long reading |
| #42999B text on black | 6.26:1 | AA | Lc -40.9 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E1ECEC
oklch(93.5% 0.012 197)
-
Step 200
200
#C9DEDE
oklch(88.5% 0.022 196.8)
-
Step 300
300
#A3C9CA
oklch(80.9% 0.04 198.4)
-
Step 400
400
#6EADAF
oklch(70.6% 0.065 198.4)
-
Step 500
500 (this color)
#42999B
oklch(63.1% 0.083 197.3)
-
Step 600
600
#158386
oklch(55.6% 0.09 197.8)
-
Step 700
700
#006F71
oklch(49.1% 0.084 197)
-
Step 800
800
#0B5A5C
oklch(42.6% 0.069 197.6)
-
Step 900
900
#164A4C
oklch(37.6% 0.054 198.8)
-
Step 950
950
#0F2C2C
oklch(27.1% 0.035 195.3)
#42999B with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #8F929B | 0.085 |
| Deuteranopia (no green cones) | #81889C | 0.080 |
| Tritanopia (no blue cones) | #009E99 | 0.028 |
| Achromatopsia (no color) | #8C8C8C | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42999B
#42999B
oklch(63.1% 0.083 197.3)
- #B67577
#B67577
oklch(63.1% 0.082 17.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #42999B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea #3C9992 ΔE 0.015
- Persian Green #2A9D8F ΔE 0.029
- Cadet Blue #5F9EA0 ΔE 0.032
- Teal Green #0A9396 ΔE 0.034
- Blue Green #0F9B8E ΔE 0.034
- Dusty Teal #4C9085 ΔE 0.035
- Grey Teal #5E9B8A ΔE 0.035
- Dull Teal #5F9E8F ΔE 0.036
Use #42999B in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.