#1F4380
Closest named color: Twilight Blue (#0A437A). oklch(39.2% 0.111 260.3), rgb(31, 67, 128).
Aa
White text reads best on this color (9.66:1).
About this color
#1F4380 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.111 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.018 away. White text reads best on it, at 9.66:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.17:1 |
| White text | 9.66:1 |
Values
| HEX | #1F4380 |
| RGB | rgb(31, 67, 128) |
| HSL | hsl(218, 61%, 31%) |
| OKLCH | oklch(39.2% 0.111 260.3) |
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 #1F4380 | 9.66:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #1F4380 | 2.17:1 | Fails | Lc 11.9 | Not readable |
| #1F4380 text on white | 9.66:1 | AAA | Lc 92.1 | Preferred for body text |
| #1F4380 text on black | 2.17:1 | Fails | Lc -10.3 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFB
oklch(93.7% 0.024 259.8)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A2C2F7
oklch(80.9% 0.083 260.4)
-
Step 400
400
#6FA0F3
oklch(70.7% 0.133 260.5)
-
Step 500
500
#4886EF
oklch(63.2% 0.171 260.3)
-
Step 600
600
#296DDD
oklch(55.6% 0.185 260.1)
-
Step 700
700
#1C5AC0
oklch(49.1% 0.172 260.2)
-
Step 800
800
#1A4A9B
oklch(42.6% 0.142 260.3)
-
Step 900
900 (this color)
#1F4380
oklch(39.2% 0.111 260.3)
-
Step 950
950
#112548
oklch(26.9% 0.07 260.7)
#1F4380 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) | #234982 | 0.019 |
| Deuteranopia (no green cones) | #0D407F | 0.017 |
| Tritanopia (no blue cones) | #00515B | 0.087 |
| Achromatopsia (no color) | #444444 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F4380
#1F4380
oklch(39.2% 0.111 260.3)
- #5C4000
#5C4000
oklch(39.3% 0.081 80.5)
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 #1F4380, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.018
- Cobalt #1E488F ΔE 0.027
- Light Navy #155084 ΔE 0.037
- Deep Sea Blue #015482 ΔE 0.050
- Dusk Blue #26538D ΔE 0.050
- Marine Blue #01386A ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.059
- Blueberry #464196 ΔE 0.063
Use #1F4380 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.