#313E7B
Closest named color: Twilight Blue (#0A437A). oklch(38.6% 0.104 271.7), rgb(49, 62, 123).
Aa
White text reads best on this color (9.97:1).
About this color
#313E7B is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.104 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.036 away. White text reads best on it, at 9.97:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.10:1 |
| White text | 9.97:1 |
Values
| HEX | #313E7B |
| RGB | rgb(49, 62, 123) |
| HSL | hsl(229, 43%, 34%) |
| OKLCH | oklch(38.6% 0.104 271.7) |
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 #313E7B | 9.97:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #313E7B | 2.10:1 | Fails | Lc 11.0 | Not readable |
| #313E7B text on white | 9.97:1 | AAA | Lc 92.9 | Preferred for body text |
| #313E7B text on black | 2.10:1 | Fails | Lc -9.5 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CFD8F7
oklch(88.5% 0.044 272.7)
-
Step 300
300
#AEBEF4
oklch(80.8% 0.079 271.7)
-
Step 400
400
#859BEE
oklch(70.7% 0.124 271.6)
-
Step 500
500
#6880E9
oklch(63.2% 0.159 271.5)
-
Step 600
600
#5166D7
oklch(55.5% 0.174 271.7)
-
Step 700
700
#4254BB
oklch(49% 0.163 271.6)
-
Step 800
800
#374697
oklch(42.8% 0.133 271.7)
-
Step 900
900 (this color)
#313E7B
oklch(38.6% 0.104 271.7)
-
Step 950
950
#1B2346
oklch(26.9% 0.066 271.6)
#313E7B 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) | #20467D | 0.027 |
| Deuteranopia (no green cones) | #153F7A | 0.030 |
| Tritanopia (no blue cones) | #004C56 | 0.093 |
| Achromatopsia (no color) | #424242 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313E7B
#313E7B
oklch(38.6% 0.104 271.7)
- #534200
#534200
oklch(38.6% 0.079 92.2)
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 #313E7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.036
- Cobalt #1E488F ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.045
- Light Navy #155084 ΔE 0.054
- Blueberry #464196 ΔE 0.056
- Marine Blue #01386A ΔE 0.058
- Dusk Blue #26538D ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.066
Use #313E7B 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.