#313E66
Closest named color: Dark Grey Blue (#29465B). oklch(37.2% 0.071 269.1), rgb(49, 62, 102).
Aa
White text reads best on this color (10.43:1).
About this color
#313E66 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.071 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.037 away. White text reads best on it, at 10.43:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.01:1 |
| White text | 10.43:1 |
Values
| HEX | #313E66 |
| RGB | rgb(49, 62, 102) |
| HSL | hsl(225, 35%, 30%) |
| OKLCH | oklch(37.2% 0.071 269.1) |
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 #313E66 | 10.43:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #313E66 | 2.01:1 | Fails | Lc 9.8 | Not readable |
| #313E66 text on white | 10.43:1 | AAA | Lc 94.1 | Preferred for body text |
| #313E66 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9ED
oklch(88.5% 0.029 268.3)
-
Step 300
300
#B2C0E4
oklch(80.9% 0.053 268.5)
-
Step 400
400
#8B9FD6
oklch(70.8% 0.084 268.8)
-
Step 500
500
#6F86CC
oklch(63.2% 0.109 269.3)
-
Step 600
600
#576EB8
oklch(55.5% 0.118 269.3)
-
Step 700
700
#475C9F
oklch(49.1% 0.11 269)
-
Step 800
800
#3B4B81
oklch(42.6% 0.092 269.7)
-
Step 900
900 (this color)
#313E66
oklch(37.2% 0.071 269.1)
-
Step 950
950
#1D253D
oklch(26.9% 0.046 269.1)
#313E66 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) | #2F4268 | 0.012 |
| Deuteranopia (no green cones) | #293D65 | 0.012 |
| Tritanopia (no blue cones) | #1B464D | 0.063 |
| Achromatopsia (no color) | #404040 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313E66
#313E66
oklch(37.2% 0.071 269.1)
- #4F3E08
#4F3E08
oklch(37.2% 0.071 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 #313E66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.037
- Twilight Blue #0A437A ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.047
- Charcoal #264653 ΔE 0.049
- Marine Blue #01386A ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.052
- Onyx #343A40 ΔE 0.065
- Midnight Green #073B4C ΔE 0.065
Use #313E66 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.