#313F50
Closest named color: Charcoal (#264653). oklch(36.3% 0.035 253.6), rgb(49, 63, 80).
Aa
White text reads best on this color (10.72:1).
About this color
#313F50 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.035 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.024 away. White text reads best on it, at 10.72:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 1.95:1 |
| White text | 10.72:1 |
Values
| HEX | #313F50 |
| RGB | rgb(49, 63, 80) |
| HSL | hsl(213, 24%, 25%) |
| OKLCH | oklch(36.3% 0.035 253.6) |
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 #313F50 | 10.72:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #313F50 | 1.95:1 | Fails | Lc 9.1 | Not readable |
| #313F50 text on white | 10.72:1 | AAA | Lc 94.9 | Preferred for body text |
| #313F50 text on black | 1.95:1 | Fails | Lc -7.8 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D3DAE3
oklch(88.6% 0.015 254.6)
-
Step 300
300
#B5C2D2
oklch(80.9% 0.027 253.6)
-
Step 400
400
#8FA3BB
oklch(70.8% 0.042 253.1)
-
Step 500
500
#738CAA
oklch(63.2% 0.054 253.2)
-
Step 600
600
#5B7595
oklch(55.5% 0.059 253.9)
-
Step 700
700
#4B637F
oklch(49.2% 0.054 252.7)
-
Step 800
800
#3E5167
oklch(42.8% 0.044 252.5)
-
Step 900
900 (this color)
#313F50
oklch(36.3% 0.035 253.6)
-
Step 950
950
#1F2731
oklch(27% 0.022 254.2)
#313F50 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) | #394051 | 0.013 |
| Deuteranopia (no green cones) | #353C50 | 0.011 |
| Tritanopia (no blue cones) | #274345 | 0.030 |
| Achromatopsia (no color) | #3E3E3E | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F50
#313F50
oklch(36.3% 0.035 253.6)
- #493B29
#493B29
oklch(36.2% 0.035 73.3)
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 #313F50, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.024
- Dark Grey Blue #29465B ΔE 0.025
- Onyx #343A40 ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.029
- Charcoal Grey #3C4142 ΔE 0.031
- Midnight Green #073B4C ΔE 0.047
- Gunmetal #293241 ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.048
Use #313F50 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.