#42839A
Closest named color: Cerulean (#457B9D). oklch(57.6% 0.075 223.6), rgb(66, 131, 154).
Aa
Black text reads best on this color (4.94:1).
About this color
#42839A is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.075 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.026 away. Black text reads best on it, at 4.94:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.94:1 |
| White text | 4.24:1 |
Values
| HEX | #42839A |
| RGB | rgb(66, 131, 154) |
| HSL | hsl(196, 40%, 43%) |
| OKLCH | oklch(57.6% 0.075 223.6) |
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 #42839A | 4.24:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #42839A | 4.94:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #42839A text on white | 4.24:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #42839A text on black | 4.94:1 | AA | Lc -32.5 | 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 600.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBEF
oklch(93.5% 0.01 228.9)
-
Step 200
200
#CDDCE2
oklch(88.5% 0.018 223.6)
-
Step 300
300
#AAC6D1
oklch(80.9% 0.034 223.5)
-
Step 400
400
#7CA8BA
oklch(70.6% 0.054 225.1)
-
Step 500
500
#5893A8
oklch(63.1% 0.069 222.9)
-
Step 600
600 (this color)
#42839A
oklch(57.6% 0.075 223.6)
-
Step 700
700
#2D697E
oklch(49% 0.07 224.1)
-
Step 800
800
#275666
oklch(42.7% 0.057 223)
-
Step 900
900
#254753
oklch(37.7% 0.045 223)
-
Step 950
950
#162A31
oklch(27.1% 0.029 222.4)
#42839A 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) | #76809B | 0.060 |
| Deuteranopia (no green cones) | #69779A | 0.052 |
| Tritanopia (no blue cones) | #008A8A | 0.049 |
| Achromatopsia (no color) | #7B7B7B | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42839A
#42839A
oklch(57.6% 0.075 223.6)
- #9F6B55
#9F6B55
oklch(57.7% 0.075 43.7)
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 #42839A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.026
- Stormy Blue #507B9C ΔE 0.027
- Teal Blue #01889F ΔE 0.030
- Grey Blue #647D8E ΔE 0.038
- Off Blue #5684AE ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.041
- Blue NCS #118AB2 ΔE 0.041
- Dull Blue #49759C ΔE 0.042
Use #42839A 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.