#375663
Closest named color: YInMn Blue (#415A77). oklch(43.4% 0.042 226.3), rgb(55, 86, 99).
Aa
White text reads best on this color (7.85:1).
About this color
#375663 is a dark, muted teal or cyan. In OKLCH its lightness is 43%, its chroma 0.042 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.037 away. White text reads best on it, at 7.85:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.67:1 |
| White text | 7.85:1 |
Values
| HEX | #375663 |
| RGB | rgb(55, 86, 99) |
| HSL | hsl(198, 29%, 30%) |
| OKLCH | oklch(43.4% 0.042 226.3) |
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 #375663 | 7.85:1 | AAA | Lc -91.9 | Preferred for body text |
| Black text on #375663 | 2.67:1 | Fails | Lc 16.8 | Dividers and decoration only |
| #375663 text on white | 7.85:1 | AAA | Lc 87.2 | Fine for body text |
| #375663 text on black | 2.67:1 | Fails | Lc -14.9 | Not readable |
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 800.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#D0DBE0
oklch(88.5% 0.014 226.6)
-
Step 300
300
#B1C4CD
oklch(80.9% 0.024 227.8)
-
Step 400
400
#87A6B4
oklch(70.7% 0.04 227.1)
-
Step 500
500
#6990A1
oklch(63.1% 0.05 226.7)
-
Step 600
600
#4F7A8C
oklch(55.5% 0.055 226.3)
-
Step 700
700
#406777
oklch(49.1% 0.051 226)
-
Step 800
800 (this color)
#375663
oklch(43.4% 0.042 226.3)
-
Step 900
900
#2E454F
oklch(37.6% 0.033 226.9)
-
Step 950
950
#1B292E
oklch(27% 0.021 222)
#375663 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) | #4F5564 | 0.033 |
| Deuteranopia (no green cones) | #484F63 | 0.030 |
| Tritanopia (no blue cones) | #255A5A | 0.029 |
| Achromatopsia (no color) | #525252 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #375663
#375663
oklch(43.4% 0.042 226.3)
- #654A3D
#654A3D
oklch(43.4% 0.042 46.8)
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 #375663, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.037
- Dark Slate Gray #2F4F4F ΔE 0.038
- Petrol #005F6A ΔE 0.040
- Deep Teal #00555A ΔE 0.044
- Dusty Grape #545775 ΔE 0.052
- Dark Green Blue #1F6357 ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.055
- Charcoal #264653 ΔE 0.059
Use #375663 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.