#31404F
Closest named color: Charcoal (#264653). oklch(36.5% 0.033 248.7), rgb(49, 64, 79).
Aa
White text reads best on this color (10.62:1).
About this color
#31404F is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.033 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.021 away. White text reads best on it, at 10.62:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 1.97:1 |
| White text | 10.62:1 |
Values
| HEX | #31404F |
| RGB | rgb(49, 64, 79) |
| HSL | hsl(210, 23%, 25%) |
| OKLCH | oklch(36.5% 0.033 248.7) |
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 #31404F | 10.62:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #31404F | 1.97:1 | Fails | Lc 9.3 | Not readable |
| #31404F text on white | 10.62:1 | AAA | Lc 94.6 | Preferred for body text |
| #31404F text on black | 1.97:1 | Fails | Lc -8.0 | 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
#D2DAE2
oklch(88.5% 0.014 248)
-
Step 300
300
#B5C2D0
oklch(80.8% 0.024 250.1)
-
Step 400
400
#8EA3B8
oklch(70.6% 0.039 248.4)
-
Step 500
500
#728CA7
oklch(63% 0.051 249.6)
-
Step 600
600
#5A7692
oklch(55.5% 0.055 248.8)
-
Step 700
700
#4A637C
oklch(49% 0.05 248.9)
-
Step 800
800
#3D5165
oklch(42.7% 0.042 248.8)
-
Step 900
900 (this color)
#31404F
oklch(36.5% 0.033 248.7)
-
Step 950
950
#1F2730
oklch(26.9% 0.02 251.6)
#31404F 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) | #3A4050 | 0.014 |
| Deuteranopia (no green cones) | #373D4F | 0.012 |
| Tritanopia (no blue cones) | #274345 | 0.027 |
| Achromatopsia (no color) | #3E3E3E | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31404F
#31404F
oklch(36.5% 0.033 248.7)
- #4A3B2C
#4A3B2C
oklch(36.4% 0.032 66.5)
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 #31404F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.021
- Dark Grey Blue #29465B ΔE 0.024
- Onyx #343A40 ΔE 0.027
- Charcoal Grey #3C4142 ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.030
- Midnight Green #073B4C ΔE 0.047
- Dark Slate Gray #2F4F4F ΔE 0.050
- Gunmetal #293241 ΔE 0.050
Use #31404F 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.