#42838F
Closest named color: Teal Blue (#01889F). oklch(57.2% 0.069 211.1), rgb(66, 131, 143).
Aa
Black text reads best on this color (4.87:1).
About this color
#42838F is a medium-dark, muted teal or cyan. In OKLCH its lightness is 57%, its chroma 0.069 and its hue 211°. 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 4.87:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (57%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 4.87:1 |
| White text | 4.30:1 |
Values
| HEX | #42838F |
| RGB | rgb(66, 131, 143) |
| HSL | hsl(189, 37%, 41%) |
| OKLCH | oklch(57.2% 0.069 211.1) |
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 #42838F | 4.30:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #42838F | 4.87:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #42838F text on white | 4.30:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #42838F text on black | 4.87:1 | AA | Lc -32.0 | 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
#CDDCE0
oklch(88.4% 0.017 215.5)
-
Step 300
300
#ABC6CC
oklch(80.8% 0.03 212.6)
-
Step 400
400
#7DA9B2
oklch(70.6% 0.049 211.6)
-
Step 500
500
#5A949F
oklch(63.1% 0.063 211)
-
Step 600
600 (this color)
#42838F
oklch(57.2% 0.069 211.1)
-
Step 700
700
#2F6A75
oklch(49% 0.063 211.5)
-
Step 800
800
#28575F
oklch(42.7% 0.053 210)
-
Step 900
900
#25484E
oklch(37.8% 0.042 209.8)
-
Step 950
950
#172A2E
oklch(27.1% 0.026 212.5)
#42838F 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) | #797F90 | 0.065 |
| Deuteranopia (no green cones) | #6D768F | 0.059 |
| Tritanopia (no blue cones) | #068887 | 0.037 |
| Achromatopsia (no color) | #7A7A7A | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42838F
#42838F
oklch(57.2% 0.069 211.1)
- #9C695F
#9C695F
oklch(57.2% 0.068 31.5)
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 #42838F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.034
- Cerulean #457B9D ΔE 0.037
- Dark Cyan #008B8B ΔE 0.038
- Stormy Blue #507B9C ΔE 0.038
- Grey Blue #647D8E ΔE 0.038
- Teal #008080 ΔE 0.044
- Ocean #017B92 ΔE 0.045
- Battleship Grey #6B7C85 ΔE 0.047
Use #42838F 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.