#313F63
Closest named color: Dark Grey Blue (#29465B). oklch(37.3% 0.065 267.1), rgb(49, 63, 99).
Aa
White text reads best on this color (10.38:1).
About this color
#313F63 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.065 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.030 away. White text reads best on it, at 10.38:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.02:1 |
| White text | 10.38:1 |
Values
| HEX | #313F63 |
| RGB | rgb(49, 63, 99) |
| HSL | hsl(223, 34%, 29%) |
| OKLCH | oklch(37.3% 0.065 267.1) |
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 #313F63 | 10.38:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #313F63 | 2.02:1 | Fails | Lc 9.9 | Not readable |
| #313F63 text on white | 10.38:1 | AAA | Lc 94.0 | Preferred for body text |
| #313F63 text on black | 2.02:1 | Fails | Lc -8.5 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D1D9EC
oklch(88.5% 0.028 267.5)
-
Step 300
300
#B3C0E1
oklch(80.9% 0.049 268.3)
-
Step 400
400
#8BA0D2
oklch(70.8% 0.077 266.8)
-
Step 500
500
#6E87C6
oklch(63% 0.1 267)
-
Step 600
600
#5770B3
oklch(55.6% 0.109 267.3)
-
Step 700
700
#475E9A
oklch(49.2% 0.1 266.9)
-
Step 800
800
#3A4D7D
oklch(42.8% 0.084 266.6)
-
Step 900
900 (this color)
#313F63
oklch(37.3% 0.065 267.1)
-
Step 950
950
#1D263B
oklch(27.1% 0.041 266)
#313F63 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) | #324264 | 0.009 |
| Deuteranopia (no green cones) | #2C3E62 | 0.008 |
| Tritanopia (no blue cones) | #1D474C | 0.059 |
| Achromatopsia (no color) | #404040 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F63
#313F63
oklch(37.3% 0.065 267.1)
- #4F3E11
#4F3E11
oklch(37.3% 0.065 87.6)
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 #313F63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.030
- Charcoal #264653 ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.047
- Twilight Blue #0A437A ΔE 0.049
- Marine Blue #01386A ΔE 0.054
- Onyx #343A40 ΔE 0.059
- Charcoal Grey #3C4142 ΔE 0.061
Use #313F63 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.