#313F5D
Closest named color: Dark Grey Blue (#29465B). oklch(36.9% 0.055 264.7), rgb(49, 63, 93).
Aa
White text reads best on this color (10.50:1).
About this color
#313F5D is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.055 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.025 away. White text reads best on it, at 10.50:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.99:1 |
| White text | 10.50:1 |
Values
| HEX | #313F5D |
| RGB | rgb(49, 63, 93) |
| HSL | hsl(221, 31%, 28%) |
| OKLCH | oklch(36.9% 0.055 264.7) |
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 #313F5D | 10.50:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #313F5D | 1.99:1 | Fails | Lc 9.6 | Not readable |
| #313F5D text on white | 10.50:1 | AAA | Lc 94.3 | Preferred for body text |
| #313F5D text on black | 1.99:1 | Fails | Lc -8.3 | 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
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B3C1DC
oklch(80.9% 0.041 263.6)
-
Step 400
400
#8CA1CB
oklch(70.8% 0.066 264)
-
Step 500
500
#7089BD
oklch(63.1% 0.084 264.4)
-
Step 600
600
#5872A9
oklch(55.6% 0.091 264.3)
-
Step 700
700
#485F91
oklch(49% 0.085 264.6)
-
Step 800
800
#3C4E76
oklch(42.7% 0.071 265.1)
-
Step 900
900 (this color)
#313F5D
oklch(36.9% 0.055 264.7)
-
Step 950
950
#1E2638
oklch(27% 0.036 265.6)
#313F5D 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) | #34415E | 0.008 |
| Deuteranopia (no green cones) | #303D5C | 0.007 |
| Tritanopia (no blue cones) | #21454A | 0.048 |
| Achromatopsia (no color) | #3F3F3F | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F5D
#313F5D
oklch(36.9% 0.055 264.7)
- #4D3D1B
#4D3D1B
oklch(36.9% 0.055 84.3)
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 #313F5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.025
- Charcoal #264653 ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.044
- Onyx #343A40 ΔE 0.049
- Charcoal Grey #3C4142 ΔE 0.051
- Midnight Green #073B4C ΔE 0.055
- Twilight Blue #0A437A ΔE 0.057
Use #313F5D 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.