#313B85
Closest named color: Dark Slate Blue (#483D8B). oklch(38.8% 0.123 273.4), rgb(49, 59, 133).
Aa
White text reads best on this color (10.02:1).
About this color
#313B85 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.123 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.038 away. White text reads best on it, at 10.02:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.09:1 |
| White text | 10.02:1 |
Values
| HEX | #313B85 |
| RGB | rgb(49, 59, 133) |
| HSL | hsl(233, 46%, 36%) |
| OKLCH | oklch(38.8% 0.123 273.4) |
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 #313B85 | 10.02:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #313B85 | 2.09:1 | Fails | Lc 11.0 | Not readable |
| #313B85 text on white | 10.02:1 | AAA | Lc 93.0 | Preferred for body text |
| #313B85 text on black | 2.09:1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CED8FC
oklch(88.6% 0.051 273.1)
-
Step 300
300
#ADBDFD
oklch(80.9% 0.092 273.3)
-
Step 400
400
#8498FC
oklch(70.8% 0.148 273.5)
-
Step 500
500
#677AFA
oklch(63% 0.19 273.3)
-
Step 600
600
#525FE9
oklch(55.6% 0.206 273.5)
-
Step 700
700
#434DCA
oklch(49% 0.191 273.5)
-
Step 800
800
#3740A4
oklch(42.7% 0.159 273.6)
-
Step 900
900 (this color)
#313B85
oklch(38.8% 0.123 273.4)
-
Step 950
950
#1B224C
oklch(27.1% 0.078 273)
#313B85 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) | #094688 | 0.041 |
| Deuteranopia (no green cones) | #003F83 | 0.040 |
| Tritanopia (no blue cones) | #004C5A | 0.105 |
| Achromatopsia (no color) | #424242 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313B85
#313B85
oklch(38.8% 0.123 273.4)
- #534300
#534300
oklch(38.8% 0.08 93.4)
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 #313B85, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.038
- Cobalt #1E488F ΔE 0.039
- Twilight Blue #0A437A ΔE 0.045
- Blueberry #464196 ΔE 0.046
- Light Navy #155084 ΔE 0.061
- Sapphire #2138AB ΔE 0.066
- Dusk Blue #26538D ΔE 0.066
- Marine Blue #01386A ΔE 0.067
Use #313B85 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.