#313F64
Closest named color: Dark Grey Blue (#29465B). oklch(37.3% 0.066 267.4), rgb(49, 63, 100).
Aa
White text reads best on this color (10.36:1).
About this color
#313F64 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.066 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.032 away. White text reads best on it, at 10.36:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.02:1 |
| White text | 10.36:1 |
Values
| HEX | #313F64 |
| RGB | rgb(49, 63, 100) |
| HSL | hsl(224, 34%, 29%) |
| OKLCH | oklch(37.3% 0.066 267.4) |
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 #313F64 | 10.36:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #313F64 | 2.02:1 | Fails | Lc 9.9 | Not readable |
| #313F64 text on white | 10.36:1 | AAA | Lc 94.0 | Preferred for body text |
| #313F64 text on black | 2.02:1 | Fails | Lc -8.6 | 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
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D1D9EC
oklch(88.5% 0.028 267.5)
-
Step 300
300
#B2C0E2
oklch(80.8% 0.051 267.6)
-
Step 400
400
#8B9FD3
oklch(70.6% 0.08 268.1)
-
Step 500
500
#6E87C8
oklch(63.1% 0.103 267.4)
-
Step 600
600
#5770B4
oklch(55.7% 0.11 267.5)
-
Step 700
700
#475D9B
oklch(49% 0.103 267.8)
-
Step 800
800
#3A4C7E
oklch(42.6% 0.086 267.7)
-
Step 900
900 (this color)
#313F64
oklch(37.3% 0.066 267.4)
-
Step 950
950
#1D263B
oklch(27.1% 0.041 266)
#313F64 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) | #314266 | 0.009 |
| Deuteranopia (no green cones) | #2C3E63 | 0.008 |
| Tritanopia (no blue cones) | #1D474D | 0.059 |
| Achromatopsia (no color) | #404040 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F64
#313F64
oklch(37.3% 0.066 267.4)
- #503E10
#503E10
oklch(37.4% 0.066 86.7)
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 #313F64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.032
- Charcoal #264653 ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.047
- Twilight Blue #0A437A ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.049
- Marine Blue #01386A ΔE 0.053
- Onyx #343A40 ΔE 0.061
- Charcoal Grey #3C4142 ΔE 0.063
Use #313F64 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.