#374755
Closest named color: Dark Grey Blue (#29465B). oklch(39% 0.031 245.1), rgb(55, 71, 85).
Aa
White text reads best on this color (9.56:1).
About this color
#374755 is a dark, muted blue. In OKLCH its lightness is 39%, its chroma 0.031 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.021 away. White text reads best on it, at 9.56:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.19:1 |
| White text | 9.56:1 |
Values
| HEX | #374755 |
| RGB | rgb(55, 71, 85) |
| HSL | hsl(208, 21%, 27%) |
| OKLCH | oklch(39% 0.031 245.1) |
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 #374755 | 9.56:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #374755 | 2.19:1 | Fails | Lc 11.8 | Not readable |
| #374755 text on white | 9.56:1 | AAA | Lc 92.1 | Preferred for body text |
| #374755 text on black | 2.19:1 | Fails | Lc -10.3 | 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 900.
-
Step 50
50
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EAEE
oklch(93.5% 0.007 247.9)
-
Step 200
200
#D2DAE1
oklch(88.4% 0.013 244.3)
-
Step 300
300
#B5C3CF
oklch(81% 0.023 243.9)
-
Step 400
400
#8EA4B7
oklch(70.8% 0.037 244.4)
-
Step 500
500
#718DA5
oklch(63.1% 0.048 244.5)
-
Step 600
600
#597790
oklch(55.6% 0.052 244.1)
-
Step 700
700
#49647B
oklch(49.1% 0.049 244.7)
-
Step 800
800
#3C5264
oklch(42.8% 0.04 243.6)
-
Step 900
900 (this color)
#374755
oklch(39% 0.031 245.1)
-
Step 950
950
#1E2830
oklch(27.1% 0.02 242.7)
#374755 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) | #414756 | 0.015 |
| Deuteranopia (no green cones) | #3E4455 | 0.013 |
| Tritanopia (no blue cones) | #2E4A4C | 0.024 |
| Achromatopsia (no color) | #454545 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374755
#374755
oklch(39% 0.031 245.1)
- #514233
#514233
oklch(39% 0.032 66.7)
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 #374755, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.021
- Charcoal #264653 ΔE 0.023
- Charcoal Grey #3C4142 ΔE 0.032
- Dark Slate Gray #2F4F4F ΔE 0.032
- Onyx #343A40 ΔE 0.048
- Dark Teal #014D4E ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.054
- Deep Teal #00555A ΔE 0.055
Use #374755 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.