#42819D
Closest named color: Cerulean (#457B9D). oklch(57.3% 0.078 229.2), rgb(66, 129, 157).
Aa
Black text reads best on this color (4.85:1).
About this color
#42819D is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 57%, its chroma 0.078 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.018 away. Black text reads best on it, at 4.85:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.85:1 |
| White text | 4.32:1 |
Values
| HEX | #42819D |
| RGB | rgb(66, 129, 157) |
| HSL | hsl(198, 41%, 44%) |
| OKLCH | oklch(57.3% 0.078 229.2) |
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 #42819D | 4.32:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #42819D | 4.85:1 | AA | Lc 34.3 | Non-text elements, placeholder text |
| #42819D text on white | 4.32:1 | AA large text | Lc 69.8 | Content text, not long reading |
| #42819D text on black | 4.85:1 | AA | Lc -31.9 | 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 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
#CDDCE4
oklch(88.6% 0.02 230.7)
-
Step 300
300
#AAC5D3
oklch(80.8% 0.035 230.3)
-
Step 400
400
#7CA8BD
oklch(70.7% 0.056 229)
-
Step 500
500
#5992AC
oklch(63.1% 0.071 228.9)
-
Step 600
600 (this color)
#42819D
oklch(57.3% 0.078 229.2)
-
Step 700
700
#2E6882
oklch(49% 0.073 230.1)
-
Step 800
800
#285569
oklch(42.7% 0.059 229.4)
-
Step 900
900
#254655
oklch(37.6% 0.046 229.2)
-
Step 950
950
#162932
oklch(26.9% 0.03 229.7)
#42819D 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) | #737F9E | 0.056 |
| Deuteranopia (no green cones) | #66759D | 0.050 |
| Tritanopia (no blue cones) | #00898A | 0.054 |
| Achromatopsia (no color) | #7A7A7A | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42819D
#42819D
oklch(57.3% 0.078 229.2)
- #9E6A4E
#9E6A4E
oklch(57.3% 0.078 49)
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 #42819D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.018
- Stormy Blue #507B9C ΔE 0.020
- Teal Blue #01889F ΔE 0.033
- Dull Blue #49759C ΔE 0.035
- Off Blue #5684AE ΔE 0.035
- Steel Blue #4682B4 ΔE 0.037
- Dusty Blue #5A86AD ΔE 0.039
- Blue NCS #118AB2 ΔE 0.039
Use #42819D 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.