#313D5E
Closest named color: Dark Grey Blue (#29465B). oklch(36.5% 0.059 268.2), rgb(49, 61, 94).
Aa
White text reads best on this color (10.71:1).
About this color
#313D5E is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.059 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.031 away. White text reads best on it, at 10.71:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.95:1 |
| White text | 10.71:1 |
Values
| HEX | #313D5E |
| RGB | rgb(49, 61, 94) |
| HSL | hsl(224, 31%, 28%) |
| OKLCH | oklch(36.5% 0.059 268.2) |
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 #313D5E | 10.71:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #313D5E | 1.95:1 | Fails | Lc 9.1 | Not readable |
| #313D5E text on white | 10.71:1 | AAA | Lc 94.8 | Preferred for body text |
| #313D5E 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EA
oklch(88.5% 0.025 267.9)
-
Step 300
300
#B4C0DE
oklch(80.8% 0.044 268.1)
-
Step 400
400
#8E9FCE
oklch(70.6% 0.072 269.1)
-
Step 500
500
#7287C1
oklch(63% 0.091 268.5)
-
Step 600
600
#5A70AE
oklch(55.5% 0.1 268.2)
-
Step 700
700
#4A5E95
oklch(49.1% 0.092 267.8)
-
Step 800
800
#3D4D79
oklch(42.7% 0.076 267.9)
-
Step 900
900 (this color)
#313D5E
oklch(36.5% 0.059 268.2)
-
Step 950
950
#1F2639
oklch(27.1% 0.037 268.4)
#313D5E 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) | #31405F | 0.009 |
| Deuteranopia (no green cones) | #2D3C5D | 0.007 |
| Tritanopia (no blue cones) | #214449 | 0.053 |
| Achromatopsia (no color) | #3E3E3E | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313D5E
#313D5E
oklch(36.5% 0.059 268.2)
- #4B3C15
#4B3C15
oklch(36.4% 0.059 87.9)
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 #313D5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.031
- Dark Blue Grey #1F3B4D ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.040
- Charcoal #264653 ΔE 0.041
- Onyx #343A40 ΔE 0.051
- Marine Blue #01386A ΔE 0.054
- Twilight Blue #0A437A ΔE 0.056
- Midnight Green #073B4C ΔE 0.056
Use #313D5E 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.