#313D69
Closest named color: Dark Grey Blue (#29465B). oklch(37.2% 0.077 270.7), rgb(49, 61, 105).
Aa
White text reads best on this color (10.48:1).
About this color
#313D69 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.077 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.043 away. White text reads best on it, at 10.48:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.00:1 |
| White text | 10.48:1 |
Values
| HEX | #313D69 |
| RGB | rgb(49, 61, 105) |
| HSL | hsl(227, 36%, 30%) |
| OKLCH | oklch(37.2% 0.077 270.7) |
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 #313D69 | 10.48:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #313D69 | 2.00:1 | Fails | Lc 9.7 | Not readable |
| #313D69 text on white | 10.48:1 | AAA | Lc 94.2 | Preferred for body text |
| #313D69 text on black | 2.00:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2BFE7
oklch(80.8% 0.058 270.9)
-
Step 400
400
#8B9EDB
oklch(70.8% 0.092 270.6)
-
Step 500
500
#6F84D1
oklch(63% 0.119 271.1)
-
Step 600
600
#586DBE
oklch(55.7% 0.128 270.8)
-
Step 700
700
#485AA4
oklch(49% 0.12 271.1)
-
Step 800
800
#3B4A85
oklch(42.7% 0.099 270.9)
-
Step 900
900 (this color)
#313D69
oklch(37.2% 0.077 270.7)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#313D69 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) | #2C426B | 0.015 |
| Deuteranopia (no green cones) | #263D68 | 0.015 |
| Tritanopia (no blue cones) | #19464E | 0.068 |
| Achromatopsia (no color) | #3F3F3F | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313D69
#313D69
oklch(37.2% 0.077 270.7)
- #4F3E00
#4F3E00
oklch(37.1% 0.076 91.2)
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 #313D69, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.043
- Twilight Blue #0A437A ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.048
- Marine Blue #01386A ΔE 0.049
- Charcoal #264653 ΔE 0.055
- Dark Blue Grey #1F3B4D ΔE 0.056
- Light Navy #155084 ΔE 0.066
- Cobalt #1E488F ΔE 0.068
Use #313D69 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.