#313F69
Closest named color: Dark Grey Blue (#29465B). oklch(37.7% 0.074 268.7), rgb(49, 63, 105).
Aa
White text reads best on this color (10.26:1).
About this color
#313F69 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.074 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.038 away. White text reads best on it, at 10.26:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.04:1 |
| White text | 10.26:1 |
Values
| HEX | #313F69 |
| RGB | rgb(49, 63, 105) |
| HSL | hsl(225, 36%, 30%) |
| OKLCH | oklch(37.7% 0.074 268.7) |
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 #313F69 | 10.26:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #313F69 | 2.04:1 | Fails | Lc 10.2 | Not readable |
| #313F69 text on white | 10.26:1 | AAA | Lc 93.7 | Preferred for body text |
| #313F69 text on black | 2.04:1 | Fails | Lc -8.8 | 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
#D0D9EE
oklch(88.5% 0.031 267.2)
-
Step 300
300
#B1C0E6
oklch(80.9% 0.056 268.2)
-
Step 400
400
#899FD9
oklch(70.8% 0.089 268.1)
-
Step 500
500
#6D86CF
oklch(63.2% 0.114 268.7)
-
Step 600
600
#556EBC
oklch(55.6% 0.125 268.7)
-
Step 700
700
#465CA2
oklch(49.2% 0.115 268.8)
-
Step 800
800
#394B83
oklch(42.6% 0.096 268.7)
-
Step 900
900 (this color)
#313F69
oklch(37.7% 0.074 268.7)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#313F69 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) | #2F436B | 0.012 |
| Deuteranopia (no green cones) | #293E68 | 0.012 |
| Tritanopia (no blue cones) | #19484F | 0.066 |
| Achromatopsia (no color) | #414141 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F69
#313F69
oklch(37.7% 0.074 268.7)
- #513F04
#513F04
oklch(37.7% 0.075 89.7)
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 #313F69, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.038
- Twilight Blue #0A437A ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.051
- Charcoal #264653 ΔE 0.052
- Marine Blue #01386A ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.056
- Light Navy #155084 ΔE 0.062
- Cobalt #1E488F ΔE 0.066
Use #313F69 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.