#42859B
Closest named color: Teal Blue (#01889F). oklch(58.2% 0.076 222), rgb(66, 133, 155).
Aa
Black text reads best on this color (5.05:1).
About this color
#42859B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.076 and its hue 222°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.029 away. Black text reads best on it, at 5.05:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #42859B |
| RGB | rgb(66, 133, 155) |
| HSL | hsl(195, 40%, 43%) |
| OKLCH | oklch(58.2% 0.076 222) |
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 #42859B | 4.15:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #42859B | 5.05:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #42859B text on white | 4.15:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #42859B text on black | 5.05:1 | AA | Lc -33.3 | 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
#CCDCE2
oklch(88.4% 0.019 222.2)
-
Step 300
300
#AAC6D1
oklch(80.9% 0.034 223.5)
-
Step 400
400
#7BA9B9
oklch(70.7% 0.054 221.4)
-
Step 500
500
#5793A8
oklch(63.1% 0.07 222.5)
-
Step 600
600 (this color)
#42859B
oklch(58.2% 0.076 222)
-
Step 700
700
#2B6A7D
oklch(49.2% 0.07 220.9)
-
Step 800
800
#265666
oklch(42.7% 0.058 222.6)
-
Step 900
900
#244753
oklch(37.7% 0.045 222.5)
-
Step 950
950
#162A31
oklch(27.1% 0.029 222.4)
#42859B 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) | #78829C | 0.062 |
| Deuteranopia (no green cones) | #6B789B | 0.056 |
| Tritanopia (no blue cones) | #008C8C | 0.047 |
| Achromatopsia (no color) | #7C7C7C | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42859B
#42859B
oklch(58.2% 0.076 222)
- #A16C57
#A16C57
oklch(58.2% 0.075 42.4)
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 #42859B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.029
- Cerulean #457B9D ΔE 0.031
- Stormy Blue #507B9C ΔE 0.031
- Off Blue #5684AE ΔE 0.038
- Dusty Blue #5A86AD ΔE 0.039
- Blue NCS #118AB2 ΔE 0.039
- Grey Blue #647D8E ΔE 0.040
- Steel Blue #4682B4 ΔE 0.043
Use #42859B 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.