#42737C
Closest named color: Deep Aqua (#08787F). oklch(52.4% 0.055 210.6), rgb(66, 115, 124).
Aa
White text reads best on this color (5.28:1).
About this color
#42737C is a medium-dark, muted teal or cyan. In OKLCH its lightness is 52%, its chroma 0.055 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Aqua (#08787F), ΔE 0.034 away. White text reads best on it, at 5.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Deep Aqua (#08787F) |
| Black text | 3.97:1 |
| White text | 5.28:1 |
Values
| HEX | #42737C |
| RGB | rgb(66, 115, 124) |
| HSL | hsl(189, 31%, 37%) |
| OKLCH | oklch(52.4% 0.055 210.6) |
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 #42737C | 5.28:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #42737C | 3.97:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #42737C text on white | 5.28:1 | AA | Lc 76.2 | Fine for body text |
| #42737C text on black | 3.97:1 | AA large text | Lc -25.6 | Dividers and decoration only |
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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEC
oklch(93.6% 0.007 208.8)
-
Step 200
200
#CFDCDE
oklch(88.5% 0.014 207.9)
-
Step 300
300
#AFC5CA
oklch(80.8% 0.025 212.9)
-
Step 400
400
#85A8AE
oklch(70.8% 0.039 209.1)
-
Step 500
500
#65929B
oklch(63.1% 0.051 211.4)
-
Step 600
600 (this color)
#42737C
oklch(52.4% 0.055 210.6)
-
Step 700
700
#3C6971
oklch(49.2% 0.051 210.1)
-
Step 800
800
#32555C
oklch(42.6% 0.042 211.7)
-
Step 900
900
#2C464B
oklch(37.5% 0.033 211)
-
Step 950
950
#1A292C
oklch(26.9% 0.021 211.4)
#42737C 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) | #6B707D | 0.052 |
| Deuteranopia (no green cones) | #62697C | 0.047 |
| Tritanopia (no blue cones) | #267776 | 0.029 |
| Achromatopsia (no color) | #6C6C6C | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42737C
#42737C
oklch(52.4% 0.055 210.6)
- #875F57
#875F57
oklch(52.5% 0.054 31.6)
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 #42737C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Aqua #08787F ΔE 0.034
- Metallic Blue #4F738E ΔE 0.034
- Bluegreen #017A79 ΔE 0.040
- Deep Turquoise #017374 ΔE 0.041
- Slate #516572 ΔE 0.042
- Dark Aquamarine #017371 ΔE 0.044
- Ocean #017B92 ΔE 0.044
- Teal #008080 ΔE 0.047
Use #42737C 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.