#37687B
Closest named color: Slate (#516572). oklch(49.1% 0.061 225.4), rgb(55, 104, 123).
Aa
White text reads best on this color (6.12:1).
About this color
#37687B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 49%, its chroma 0.061 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.031 away. White text reads best on it, at 6.12:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (49%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.42:1 |
| White text | 6.12:1 |
Values
| HEX | #37687B |
| RGB | rgb(55, 104, 123) |
| HSL | hsl(197, 38%, 35%) |
| OKLCH | oklch(49.1% 0.061 225.4) |
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 #37687B | 6.12:1 | AA | Lc -85.6 | Fine for body text |
| Black text on #37687B | 3.42:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #37687B text on white | 6.12:1 | AA | Lc 80.4 | Fine for body text |
| #37687B text on black | 3.42:1 | AA large text | Lc -21.4 | 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 700.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBEE
oklch(93.6% 0.009 225.1)
-
Step 200
200
#CEDCE1
oklch(88.5% 0.017 221.1)
-
Step 300
300
#ADC5CF
oklch(80.9% 0.03 224.8)
-
Step 400
400
#81A7B7
oklch(70.6% 0.047 225.6)
-
Step 500
500
#6192A5
oklch(63.2% 0.06 224.3)
-
Step 600
600
#467C91
oklch(55.7% 0.066 225.2)
-
Step 700
700 (this color)
#37687B
oklch(49.1% 0.061 225.4)
-
Step 800
800
#2E5564
oklch(42.7% 0.051 225)
-
Step 900
900
#2A4652
oklch(37.7% 0.04 227)
-
Step 950
950
#192930
oklch(27% 0.025 227.2)
#37687B 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) | #5E667C | 0.048 |
| Deuteranopia (no green cones) | #545F7B | 0.041 |
| Tritanopia (no blue cones) | #066E6E | 0.043 |
| Achromatopsia (no color) | #626262 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37687B
#37687B
oklch(49.1% 0.061 225.4)
- #7E5643
#7E5643
oklch(49.2% 0.061 46.3)
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 #37687B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.031
- Denim #3B638C ΔE 0.036
- YInMn Blue #415A77 ΔE 0.042
- Dark Aqua #05696B ΔE 0.043
- Deep Turquoise #017374 ΔE 0.046
- Sea Blue #047495 ΔE 0.049
- Dark Aquamarine #017371 ΔE 0.049
- Peacock Blue #016795 ΔE 0.050
Use #37687B 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.