#313F60
Closest named color: Dark Grey Blue (#29465B). oklch(37.1% 0.06 266), rgb(49, 63, 96).
Aa
White text reads best on this color (10.44:1).
About this color
#313F60 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.060 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.027 away. White text reads best on it, at 10.44:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.01:1 |
| White text | 10.44:1 |
Values
| HEX | #313F60 |
| RGB | rgb(49, 63, 96) |
| HSL | hsl(222, 32%, 28%) |
| OKLCH | oklch(37.1% 0.06 266) |
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 #313F60 | 10.44:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #313F60 | 2.01:1 | Fails | Lc 9.7 | Not readable |
| #313F60 text on white | 10.44:1 | AAA | Lc 94.2 | Preferred for body text |
| #313F60 text on black | 2.01:1 | Fails | Lc -8.4 | 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
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D1D9EA
oklch(88.4% 0.025 265.6)
-
Step 300
300
#B3C1DF
oklch(81% 0.045 265.5)
-
Step 400
400
#8CA0CE
oklch(70.7% 0.071 266.3)
-
Step 500
500
#6F88C2
oklch(63.1% 0.093 266)
-
Step 600
600
#5871AE
oklch(55.6% 0.1 266.3)
-
Step 700
700
#485F96
oklch(49.3% 0.093 265.9)
-
Step 800
800
#3B4D79
oklch(42.6% 0.077 266.3)
-
Step 900
900 (this color)
#313F60
oklch(37.1% 0.06 266)
-
Step 950
950
#1E2639
oklch(27% 0.037 266.4)
#313F60 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) | #334261 | 0.010 |
| Deuteranopia (no green cones) | #2E3E5F | 0.006 |
| Tritanopia (no blue cones) | #1F464B | 0.054 |
| Achromatopsia (no color) | #404040 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F60
#313F60
oklch(37.1% 0.06 266)
- #4E3E16
#4E3E16
oklch(37.2% 0.061 87.1)
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 #313F60, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.027
- Charcoal #264653 ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.045
- Twilight Blue #0A437A ΔE 0.053
- Onyx #343A40 ΔE 0.054
- Marine Blue #01386A ΔE 0.055
- Charcoal Grey #3C4142 ΔE 0.056
Use #313F60 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.