#0F3781
Closest named color: Twilight Blue (#0A437A). oklch(35.9% 0.133 261.4), rgb(15, 55, 129).
Aa
White text reads best on this color (11.14:1).
About this color
#0F3781 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.133 and its hue 261°. 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 11.14:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.88:1 |
| White text | 11.14:1 |
Values
| HEX | #0F3781 |
| RGB | rgb(15, 55, 129) |
| HSL | hsl(219, 79%, 28%) |
| OKLCH | oklch(35.9% 0.133 261.4) |
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 #0F3781 | 11.14:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #0F3781 | 1.88:1 | Fails | Lc 8.7 | Not readable |
| #0F3781 text on white | 11.14:1 | AAA | Lc 95.2 | Preferred for body text |
| #0F3781 text on black | 1.88:1 | Fails | Lc -7.5 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFE
oklch(93.7% 0.029 259.6)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#699FFF
oklch(70.8% 0.152 261.1)
-
Step 500
500
#3F82FF
oklch(63.1% 0.198 261.5)
-
Step 600
600
#1A67F2
oklch(55.7% 0.221 261.3)
-
Step 700
700
#0C54D2
oklch(49.1% 0.205 261.4)
-
Step 800
800
#0E46AA
oklch(42.8% 0.17 261.3)
-
Step 900
900 (this color)
#0F3781
oklch(35.9% 0.133 261.4)
-
Step 950
950
#0D244F
oklch(27% 0.084 261.5)
#0F3781 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) | #004184 | 0.027 |
| Deuteranopia (no green cones) | #003680 | 0.009 |
| Tritanopia (no blue cones) | #004A56 | 0.103 |
| Achromatopsia (no color) | #3B3B3B | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0F3781
#0F3781
oklch(35.9% 0.133 261.4)
- #503800
#503800
oklch(35.9% 0.074 81.7)
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 #0F3781, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Marine Blue #01386A ΔE 0.041
- Cobalt #1E488F ΔE 0.055
- Marine #042E60 ΔE 0.063
- Royal #0C1793 ΔE 0.071
- Sapphire #2138AB ΔE 0.072
- Prussian Blue #1D3557 ΔE 0.073
- Light Navy #155084 ΔE 0.073
Use #0F3781 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.