#313F5C
Closest named color: Dark Grey Blue (#29465B). oklch(36.9% 0.054 264.2), rgb(49, 63, 92).
Aa
White text reads best on this color (10.52:1).
About this color
#313F5C is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.054 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.024 away. White text reads best on it, at 10.52:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.99:1 |
| White text | 10.52:1 |
Values
| HEX | #313F5C |
| RGB | rgb(49, 63, 92) |
| HSL | hsl(220, 30%, 28%) |
| OKLCH | oklch(36.9% 0.054 264.2) |
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 #313F5C | 10.52:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #313F5C | 1.99:1 | Fails | Lc 9.6 | Not readable |
| #313F5C text on white | 10.52:1 | AAA | Lc 94.4 | Preferred for body text |
| #313F5C text on black | 1.99:1 | Fails | Lc -8.2 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E8
oklch(88.4% 0.022 265.8)
-
Step 300
300
#B4C1DB
oklch(80.9% 0.039 264.3)
-
Step 400
400
#8CA1CA
oklch(70.8% 0.065 263.6)
-
Step 500
500
#7089BC
oklch(63.1% 0.083 264)
-
Step 600
600
#5972A8
oklch(55.6% 0.09 264.7)
-
Step 700
700
#496090
oklch(49.2% 0.082 264.1)
-
Step 800
800
#3C4E75
oklch(42.7% 0.069 264.7)
-
Step 900
900 (this color)
#313F5C
oklch(36.9% 0.054 264.2)
-
Step 950
950
#1E2637
oklch(26.9% 0.034 264.8)
#313F5C 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) | #35415D | 0.009 |
| Deuteranopia (no green cones) | #303D5B | 0.007 |
| Tritanopia (no blue cones) | #224549 | 0.048 |
| Achromatopsia (no color) | #3F3F3F | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F5C
#313F5C
oklch(36.9% 0.054 264.2)
- #4D3D1C
#4D3D1C
oklch(36.9% 0.054 83.7)
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 #313F5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.024
- Charcoal #264653 ΔE 0.034
- Dark Blue Grey #1F3B4D ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.044
- Onyx #343A40 ΔE 0.047
- Charcoal Grey #3C4142 ΔE 0.050
- Midnight Green #073B4C ΔE 0.054
- Twilight Blue #0A437A ΔE 0.058
Use #313F5C 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.