#31517F
Closest named color: Dusk Blue (#26538D). oklch(43.3% 0.086 257.5), rgb(49, 81, 127).
Aa
White text reads best on this color (8.03:1).
About this color
#31517F is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.086 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.024 away. White text reads best on it, at 8.03:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.61:1 |
| White text | 8.03:1 |
Values
| HEX | #31517F |
| RGB | rgb(49, 81, 127) |
| HSL | hsl(215, 44%, 35%) |
| OKLCH | oklch(43.3% 0.086 257.5) |
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 #31517F | 8.03:1 | AAA | Lc -92.4 | Preferred for body text |
| Black text on #31517F | 2.61:1 | Fails | Lc 16.3 | Dividers and decoration only |
| #31517F text on white | 8.03:1 | AAA | Lc 87.7 | Fine for body text |
| #31517F text on black | 2.61:1 | Fails | Lc -14.5 | 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 800.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAEC
oklch(88.5% 0.028 258.4)
-
Step 300
300
#ADC2E1
oklch(80.8% 0.05 258)
-
Step 400
400
#81A2D3
oklch(70.6% 0.081 258.1)
-
Step 500
500
#618BC7
oklch(63.1% 0.102 257.3)
-
Step 600
600
#4874B3
oklch(55.6% 0.11 257.4)
-
Step 700
700
#39619A
oklch(49.1% 0.103 257.4)
-
Step 800
800 (this color)
#31517F
oklch(43.3% 0.086 257.5)
-
Step 900
900
#2A4265
oklch(37.7% 0.067 257.7)
-
Step 950
950
#19273B
oklch(27% 0.042 257.3)
#31517F 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) | #3E5481 | 0.019 |
| Deuteranopia (no green cones) | #334D7E | 0.012 |
| Tritanopia (no blue cones) | #005B62 | 0.072 |
| Achromatopsia (no color) | #505050 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31517F
#31517F
oklch(43.3% 0.086 257.5)
- #6A4A0A
#6A4A0A
oklch(43.3% 0.086 78.4)
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 #31517F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.024
- Light Navy #155084 ΔE 0.025
- Light Navy Blue #2E5A88 ΔE 0.028
- Deep Sea Blue #015482 ΔE 0.030
- YInMn Blue #415A77 ΔE 0.040
- Dusk #4E5481 ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.042
- Twilight #4E518B ΔE 0.045
Use #31517F 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.