#313F70
Closest named color: Twilight Blue (#0A437A). oklch(38.1% 0.086 270), rgb(49, 63, 112).
Aa
White text reads best on this color (10.11:1).
About this color
#313F70 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.086 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.037 away. White text reads best on it, at 10.11:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.07:1 |
| White text | 10.11:1 |
Values
| HEX | #313F70 |
| RGB | rgb(49, 63, 112) |
| HSL | hsl(227, 39%, 32%) |
| OKLCH | oklch(38.1% 0.086 270) |
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 #313F70 | 10.11:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #313F70 | 2.07:1 | Fails | Lc 10.6 | Not readable |
| #313F70 text on white | 10.11:1 | AAA | Lc 93.4 | Preferred for body text |
| #313F70 text on black | 2.07:1 | Fails | Lc -9.1 | 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
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#D0D9F2
oklch(88.6% 0.036 269.9)
-
Step 300
300
#B0BFEB
oklch(80.8% 0.065 270.2)
-
Step 400
400
#879DE1
oklch(70.6% 0.103 269.9)
-
Step 500
500
#6B84D9
oklch(63.2% 0.131 270)
-
Step 600
600
#536CC6
oklch(55.7% 0.142 269.6)
-
Step 700
700
#4459AB
oklch(49% 0.133 270.1)
-
Step 800
800
#38498B
oklch(42.6% 0.111 270.3)
-
Step 900
900 (this color)
#313F70
oklch(38.1% 0.086 270)
-
Step 950
950
#1C2541
oklch(27.1% 0.054 269.1)
#313F70 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) | #2B4572 | 0.018 |
| Deuteranopia (no green cones) | #233F6F | 0.018 |
| Tritanopia (no blue cones) | #114A52 | 0.077 |
| Achromatopsia (no color) | #424242 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F70
#313F70
oklch(38.1% 0.086 270)
- #534000
#534000
oklch(38.1% 0.078 89.6)
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 #313F70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.048
- Marine Blue #01386A ΔE 0.053
- Cobalt #1E488F ΔE 0.056
- Light Navy #155084 ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.059
- Charcoal #264653 ΔE 0.062
Use #313F70 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.