#42858F
Closest named color: Teal Blue (#01889F). oklch(57.7% 0.069 208.2), rgb(66, 133, 143).
Aa
Black text reads best on this color (4.98:1).
About this color
#42858F is a medium-dark, muted teal or cyan. In OKLCH its lightness is 58%, its chroma 0.069 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.034 away. Black text reads best on it, at 4.98:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #42858F |
| RGB | rgb(66, 133, 143) |
| HSL | hsl(188, 37%, 41%) |
| OKLCH | oklch(57.7% 0.069 208.2) |
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 #42858F | 4.21:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #42858F | 4.98:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #42858F text on white | 4.21:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #42858F text on black | 4.98:1 | AA | Lc -32.7 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECED
oklch(93.7% 0.01 204.9)
-
Step 200
200
#CDDDDF
oklch(88.6% 0.017 205.8)
-
Step 300
300
#AAC7CB
oklch(80.9% 0.032 206.7)
-
Step 400
400
#7CAAB1
oklch(70.8% 0.05 207.8)
-
Step 500
500
#58959E
oklch(63.2% 0.065 207.7)
-
Step 600
600 (this color)
#42858F
oklch(57.7% 0.069 208.2)
-
Step 700
700
#2D6B74
oklch(49.1% 0.065 208.2)
-
Step 800
800
#27575E
oklch(42.6% 0.053 208)
-
Step 900
900
#25484D
oklch(37.7% 0.041 207.5)
-
Step 950
950
#162A2D
oklch(26.9% 0.026 207.9)
#42858F 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) | #7B8190 | 0.067 |
| Deuteranopia (no green cones) | #6F778F | 0.062 |
| Tritanopia (no blue cones) | #048A88 | 0.036 |
| Achromatopsia (no color) | #7B7B7B | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42858F
#42858F
oklch(57.7% 0.069 208.2)
- #9F6A62
#9F6A62
oklch(57.8% 0.07 28.8)
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 #42858F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.034
- Dark Cyan #008B8B ΔE 0.035
- Grey Blue #647D8E ΔE 0.041
- Cerulean #457B9D ΔE 0.042
- Dusty Teal #4C9085 ΔE 0.043
- Stormy Blue #507B9C ΔE 0.043
- Teal Green #0A9396 ΔE 0.043
- Teal #008080 ΔE 0.045
Use #42858F 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.