#1F3784
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.133 266.6), rgb(31, 55, 132).
Aa
White text reads best on this color (10.83:1).
About this color
#1F3784 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.133 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.040 away. White text reads best on it, at 10.83:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.93:1 |
| White text | 10.83:1 |
Values
| HEX | #1F3784 |
| RGB | rgb(31, 55, 132) |
| HSL | hsl(226, 62%, 32%) |
| OKLCH | oklch(36.8% 0.133 266.6) |
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 #1F3784 | 10.83:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #1F3784 | 1.93:1 | Fails | Lc 9.3 | Not readable |
| #1F3784 text on white | 10.83:1 | AAA | Lc 94.6 | Preferred for body text |
| #1F3784 text on black | 1.93:1 | Fails | Lc -8.0 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#759BFF
oklch(70.6% 0.153 266.8)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600
#3862F2
oklch(55.6% 0.221 266.5)
-
Step 700
700
#2C50D3
oklch(49.2% 0.205 266.6)
-
Step 800
800
#2442AA
oklch(42.6% 0.17 266.5)
-
Step 900
900 (this color)
#1F3784
oklch(36.8% 0.133 266.6)
-
Step 950
950
#13234F
oklch(27.1% 0.084 265.9)
#1F3784 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) | #004287 | 0.032 |
| Deuteranopia (no green cones) | #003982 | 0.021 |
| Tritanopia (no blue cones) | #004A58 | 0.105 |
| Achromatopsia (no color) | #3D3D3D | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3784
#1F3784
oklch(36.8% 0.133 266.6)
- #503C00
#503C00
oklch(36.8% 0.075 87.4)
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 #1F3784, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.040
- Cobalt #1E488F ΔE 0.049
- Marine Blue #01386A ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.064
- Sapphire #2138AB ΔE 0.065
- Blueberry #464196 ΔE 0.070
- Light Navy #155084 ΔE 0.070
- Marine #042E60 ΔE 0.073
Use #1F3784 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.