#313F59
Closest named color: Dark Grey Blue (#29465B). oklch(36.7% 0.049 262.4), rgb(49, 63, 89).
Aa
White text reads best on this color (10.57:1).
About this color
#313F59 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.049 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.023 away. White text reads best on it, at 10.57:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.98:1 |
| White text | 10.57:1 |
Values
| HEX | #313F59 |
| RGB | rgb(49, 63, 89) |
| HSL | hsl(219, 29%, 27%) |
| OKLCH | oklch(36.7% 0.049 262.4) |
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 #313F59 | 10.57:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #313F59 | 1.98:1 | Fails | Lc 9.4 | Not readable |
| #313F59 text on white | 10.57:1 | AAA | Lc 94.5 | Preferred for body text |
| #313F59 text on black | 1.98:1 | Fails | Lc -8.1 | 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
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D2D9E7
oklch(88.4% 0.021 264.5)
-
Step 300
300
#B4C1D9
oklch(80.9% 0.037 262.8)
-
Step 400
400
#8DA1C6
oklch(70.7% 0.059 262.6)
-
Step 500
500
#718AB7
oklch(63.2% 0.074 261.9)
-
Step 600
600
#5973A3
oklch(55.5% 0.081 262.2)
-
Step 700
700
#49608C
oklch(49% 0.076 262.7)
-
Step 800
800
#3C4F72
oklch(42.8% 0.063 262.1)
-
Step 900
900 (this color)
#313F59
oklch(36.7% 0.049 262.4)
-
Step 950
950
#1E2636
oklch(26.9% 0.032 263.8)
#313F59 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) | #36415A | 0.010 |
| Deuteranopia (no green cones) | #313D58 | 0.006 |
| Tritanopia (no blue cones) | #234448 | 0.043 |
| Achromatopsia (no color) | #3F3F3F | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F59
#313F59
oklch(36.7% 0.049 262.4)
- #4C3D20
#4C3D20
oklch(36.9% 0.049 82.7)
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 #313F59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.023
- Charcoal #264653 ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.035
- Onyx #343A40 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.044
- Charcoal Grey #3C4142 ΔE 0.045
- Midnight Green #073B4C ΔE 0.052
- Gunmetal #293241 ΔE 0.055
Use #313F59 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.