#1F427A
Closest named color: Twilight Blue (#0A437A). oklch(38.5% 0.104 259.4), rgb(31, 66, 122).
Aa
White text reads best on this color (9.91:1).
About this color
#1F427A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.104 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.014 away. White text reads best on it, at 9.91:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.11:1 |
| White text | 9.91:1 |
Values
| HEX | #1F427A |
| RGB | rgb(31, 66, 122) |
| HSL | hsl(217, 59%, 30%) |
| OKLCH | oklch(38.5% 0.104 259.4) |
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 #1F427A | 9.91:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #1F427A | 2.11:1 | Fails | Lc 11.2 | Not readable |
| #1F427A text on white | 9.91:1 | AAA | Lc 92.7 | Preferred for body text |
| #1F427A text on black | 2.11:1 | Fails | Lc -9.8 | 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
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A3C2F3
oklch(80.9% 0.077 259.4)
-
Step 400
400
#71A1EE
oklch(70.7% 0.125 259.5)
-
Step 500
500
#4B87E8
oklch(63% 0.159 259.6)
-
Step 600
600
#2D6FD6
oklch(55.7% 0.172 259.3)
-
Step 700
700
#205CBA
oklch(49.2% 0.161 259.5)
-
Step 800
800
#1C4C96
oklch(42.8% 0.132 259.1)
-
Step 900
900 (this color)
#1F427A
oklch(38.5% 0.104 259.4)
-
Step 950
950
#122646
oklch(27.1% 0.065 259.4)
#1F427A 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) | #26477C | 0.018 |
| Deuteranopia (no green cones) | #153F79 | 0.013 |
| Tritanopia (no blue cones) | #004F58 | 0.081 |
| Achromatopsia (no color) | #434343 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F427A
#1F427A
oklch(38.5% 0.104 259.4)
- #5A3E00
#5A3E00
oklch(38.6% 0.08 79.8)
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 #1F427A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.014
- Cobalt #1E488F ΔE 0.037
- Light Navy #155084 ΔE 0.042
- Marine Blue #01386A ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.053
- Dusk Blue #26538D ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.064
Use #1F427A 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.