#42829B
Closest named color: Cerulean (#457B9D). oklch(57.4% 0.076 226), rgb(66, 130, 155).
Aa
Black text reads best on this color (4.89:1).
About this color
#42829B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.076 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.022 away. Black text reads best on it, at 4.89:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.89:1 |
| White text | 4.28:1 |
Values
| HEX | #42829B |
| RGB | rgb(66, 130, 155) |
| HSL | hsl(197, 40%, 43%) |
| OKLCH | oklch(57.4% 0.076 226) |
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 #42829B | 4.28:1 | AA large text | Lc -75.0 | Content text, not long reading |
| Black text on #42829B | 4.89:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #42829B text on white | 4.28:1 | AA large text | Lc 69.5 | Content text, not long reading |
| #42829B text on black | 4.89:1 | AA | Lc -32.2 | 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
#CDDCE3
oklch(88.5% 0.019 227.3)
-
Step 300
300
#AAC6D2
oklch(81% 0.035 225.6)
-
Step 400
400
#7CA8BB
oklch(70.7% 0.055 226.4)
-
Step 500
500
#5992AA
oklch(63% 0.07 226.8)
-
Step 600
600 (this color)
#42829B
oklch(57.4% 0.076 226)
-
Step 700
700
#2E697F
oklch(49.1% 0.07 225.5)
-
Step 800
800
#275667
oklch(42.8% 0.058 224.4)
-
Step 900
900
#254754
oklch(37.8% 0.045 224.9)
-
Step 950
950
#162931
oklch(26.8% 0.029 226.7)
#42829B 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) | #74809C | 0.057 |
| Deuteranopia (no green cones) | #68769B | 0.052 |
| Tritanopia (no blue cones) | #00898A | 0.050 |
| Achromatopsia (no color) | #7A7A7A | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42829B
#42829B
oklch(57.4% 0.076 226)
- #9E6A52
#9E6A52
oklch(57.3% 0.076 45.5)
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 #42829B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.022
- Stormy Blue #507B9C ΔE 0.024
- Teal Blue #01889F ΔE 0.031
- Off Blue #5684AE ΔE 0.038
- Grey Blue #647D8E ΔE 0.039
- Dull Blue #49759C ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.040
- Steel Blue #4682B4 ΔE 0.040
Use #42829B 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.